SARA R4/N4 Series R4 N4 Sys Integr Manual (UBX 16029218)
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SARA-R4/N4 series System Integration Manual System Integration Manual SARA-R4/N4 Abstract This document describes the features and the integration of the size-optimized SARA-R4/N4 series cellular modules. These modules are a complete, cost efficient, performance optimized, multi-mode and multi band LTE Cat M1 / NB1 and EGPRS solution in the compact SARA form factor. www.u-blox.com UBX-16029218 - R11 SARA-R4/N4 series - System Integration Manual Document Information Title SARA-R4/N4 series Subtitle System Integration Manual Document type System Integration Manual Document number UBX-16029218 Revision and date R11 20-Feb-2019 Disclosure Restriction Product status Corresponding content status Functional Sample Draft For functional testing. Revised and supplementary data will be published later. In Development / Prototype Objective Specification Target values. Revised and supplementary data will be published later. Engineering Sample Advance Information Data based on early testing. Revised and supplementary data will be published later. Initial Production Early Production Information Data from product verification. Revised and supplementary data may be published later. Mass Production / End of Life Production Information Document contains the final product specification. This document applies to the following products: Product name Type number Modem version SARA-R404M SARA-R404M-00B-00 SARA-R404M-00B-01 PCN reference Product status K0.0.00.00.07.06 UBX-17047084 End of Life K0.0.00.00.07.08 UBX-18053670 Initial Production SARA-R410M-01B-00 L0.0.00.00.02.03 UBX-17051617 Initial Production SARA-R410M-02B-00 L0.0.00.00.05.06 A02.00 UBX-18010263 Initial Production SARA-R410M-52B-00 L0.0.00.00.06.05 A02.06 UBX-18045915 Initial Production SARA-R412M SARA-R412M-02B-00 M0.09.00 A02.11 UBX-19004091 Initial Production SARA-N410 SARA-N410-02B-00 L0.0.00.00.07.07 A02.09 UBX-18057459 Initial Production SARA-R410M Application version u-blox or third parties may hold intellectual property rights in the products, names, logos and designs included in this document. Copying, reproduction, modification or disclosure to third parties of this document or any part thereof is only permitted with the express written permission of u-blox. The information contained herein is provided “as is” and u-blox assumes no liability for its use. No warranty, either express or implied, is given, including but not limited to, with respect to the accuracy, correctness, reliability and fitness for a particular purpose of the information. This document may be revised by u-blox at any time without notice. For the most recent documents, visit www.u-blox.com. Copyright © u-blox AG. UBX-16029218 - R11 Page 2 of 116 SARA-R4/N4 series - System Integration Manual Contents Document Information ................................................................................................................................ 2 Contents .......................................................................................................................................................... 3 1 System description ............................................................................................................................... 6 1.1 Overview ........................................................................................................................................................ 6 1.2 Architecture ................................................................................................................................................. 9 1.3 Pin-out ......................................................................................................................................................... 10 1.4 Operating modes ....................................................................................................................................... 14 1.5 Supply interfaces ....................................................................................................................................... 17 1.5.1 Module supply input (VCC) .............................................................................................................. 17 1.5.2 Generic digital interfaces supply output (V_INT) ....................................................................... 22 1.6 System function interfaces .................................................................................................................... 23 1.6.1 Module power-on .............................................................................................................................. 23 1.6.2 Module power-off .............................................................................................................................. 24 1.6.3 Module reset ...................................................................................................................................... 26 1.7 Antenna interface ..................................................................................................................................... 27 1.7.1 Antenna RF interface (ANT) ........................................................................................................... 27 1.7.2 Antenna detection interface (ANT_DET)..................................................................................... 28 1.8 SIM interface .............................................................................................................................................. 28 1.8.1 SIM interface ..................................................................................................................................... 28 1.8.2 SIM detection interface ................................................................................................................... 28 1.9 Data communication interfaces ............................................................................................................ 29 1.9.1 UART interface .................................................................................................................................. 29 1.9.2 USB interface ..................................................................................................................................... 31 1.9.3 SPI interface ...................................................................................................................................... 32 1.9.4 SDIO interface ................................................................................................................................... 32 1.9.5 DDC (I2C) interface ............................................................................................................................ 32 1.10 Audio ............................................................................................................................................................ 32 1.11 General Purpose Input/Output ............................................................................................................... 33 1.12 Reserved pins (RSVD) .............................................................................................................................. 33 1.13 System features ........................................................................................................................................ 34 1.13.1 Network indication ........................................................................................................................... 34 1.13.2 Antenna supervisor .......................................................................................................................... 34 1.13.3 Dual stack IPv4/IPv6 ......................................................................................................................... 34 1.13.4 TCP/IP and UDP/IP ............................................................................................................................ 34 1.13.5 FTP ....................................................................................................................................................... 34 1.13.6 HTTP ....................................................................................................................................................35 1.13.7 Firmware update Over AT (FOAT) .................................................................................................35 1.13.8 Firmware update Over The Air (uFOTA) .......................................................................................35 1.13.9 Power saving ......................................................................................................................................35 2 Design-in ................................................................................................................................................ 38 UBX-16029218 - R11 Page 3 of 116 SARA-R4/N4 series - System Integration Manual 2.1 Overview ......................................................................................................................................................38 2.2 Supply interfaces ...................................................................................................................................... 39 2.2.1 Module supply (VCC) ........................................................................................................................ 39 2.2.2 Generic digital interfaces supply output (V_INT) .......................................................................55 2.3 System functions interfaces .................................................................................................................. 56 2.3.1 Module power-on (PWR_ON) .......................................................................................................... 56 2.3.2 Module reset (RESET_N) ................................................................................................................. 57 2.4 Antenna interface .....................................................................................................................................58 2.4.1 Antenna RF interface (ANT) ...........................................................................................................58 2.4.2 Antenna detection interface (ANT_DET)..................................................................................... 65 2.5 SIM interface ..............................................................................................................................................68 2.5.1 Guidelines for SIM circuit design ...................................................................................................68 2.5.2 Guidelines for SIM layout design ................................................................................................... 72 2.6 Data communication interfaces ............................................................................................................ 73 2.6.1 UART interface .................................................................................................................................. 73 2.6.2 USB interface ..................................................................................................................................... 78 2.6.3 SPI interface ..................................................................................................................................... 80 2.6.4 SDIO interface .................................................................................................................................. 80 2.6.5 DDC (I2C) interface ........................................................................................................................... 80 2.7 Audio ............................................................................................................................................................ 82 2.7.1 Guidelines for Audio circuit design ................................................................................................ 82 2.8 General Purpose Input/Output ...............................................................................................................83 2.8.1 Guidelines for GPIO circuit design .................................................................................................83 2.8.2 Guidelines for general purpose input/output layout design ....................................................83 2.9 Reserved pins (RSVD) ..............................................................................................................................84 2.10 Module placement ....................................................................................................................................84 2.11 Module footprint and paste mask .........................................................................................................85 2.12 Thermal guidelines ...................................................................................................................................86 2.13 Schematic for SARA-R4/N4 series module integration .................................................................... 87 2.13.1 Schematic for SARA-R4/N4 series modules ............................................................................... 87 2.14 Design-in checklist....................................................................................................................................88 2.14.1 Schematic checklist .........................................................................................................................88 2.14.2 Layout checklist ................................................................................................................................88 2.14.3 Antenna checklist .............................................................................................................................89 3 Handling and soldering ..................................................................................................................... 90 3.1 Packaging, shipping, storage and moisture preconditioning ..........................................................90 3.2 Handling ......................................................................................................................................................90 3.3 Soldering ..................................................................................................................................................... 91 3.3.1 Soldering paste ................................................................................................................................. 91 3.3.2 Reflow soldering ................................................................................................................................ 91 3.3.3 Optical inspection ............................................................................................................................. 92 3.3.4 Cleaning .............................................................................................................................................. 92 3.3.5 Repeated reflow soldering .............................................................................................................. 93 UBX-16029218 - R11 Page 4 of 116 SARA-R4/N4 series - System Integration Manual 3.3.6 Wave soldering .................................................................................................................................. 93 3.3.7 Hand soldering .................................................................................................................................. 93 3.3.8 Rework ................................................................................................................................................ 93 3.3.9 Conformal coating ............................................................................................................................ 93 3.3.10 Casting ................................................................................................................................................ 93 3.3.11 Grounding metal covers .................................................................................................................. 94 3.3.12 Use of ultrasonic processes ........................................................................................................... 94 4 Approvals............................................................................................................................................... 95 4.1 Product certification approval overview ............................................................................................... 95 4.2 US Federal Communications Commission notice .............................................................................. 97 4.2.1 Safety warnings review the structure .......................................................................................... 97 4.2.2 Declaration of Conformity ............................................................................................................... 97 4.2.3 Modifications .....................................................................................................................................98 4.3 Innovation, Science, Economic Development Canada notice ..........................................................98 4.3.1 Declaration of Conformity ...............................................................................................................98 4.3.2 Modifications ..................................................................................................................................... 99 4.4 European Conformance CE mark ......................................................................................................... 101 4.5 Taiwanese National Communication Commission ........................................................................... 101 5 Product testing ..................................................................................................................................102 5.1 u-blox in-series production test ........................................................................................................... 102 5.2 Test parameters for OEM manufacturers ......................................................................................... 103 5.2.1 “Go/No go” tests for integrated devices .................................................................................... 103 5.2.2 RF functional tests ......................................................................................................................... 103 Appendix ......................................................................................................................................................105 A Migration between SARA modules ..............................................................................................105 A.1 Overview .................................................................................................................................................... 105 A.2 Pin-out comparison ................................................................................................................................ 107 B Glossary .................................................................................................................................................112 Related documents .................................................................................................................................. 114 Revision history ......................................................................................................................................... 115 Contact ......................................................................................................................................................... 116 UBX-16029218 - R11 Page 5 of 116 SARA-R4/N4 series - System Integration Manual 1 System description 1.1 Overview The SARA-R4/N4 series comprises LTE Cat M1, LTE Cat NB1 and EGPRS multi-mode modules in the miniature SARA LGA form-factor (26.0 x 16.0 mm, 96-pin), that allow easy integration in compact designs and a seamless drop-in migration from u-blox cellular module families. SARA-R4/N4 series modules are form-factor compatible with u-blox LISA, LARA and TOBY cellular module families and are pin-to-pin compatible with u-blox SARA-N, SARA-G and SARA-U cellular module families. This facilitates migration from u-blox NB-IoT, GSM/GPRS, CDMA, UMTS/HSPA and other LTE modules, maximizes customer investments, simplifies logistics, and enables very short time-to-market. See Table 1 for a summary of the main features and interfaces. The modules are ideal for LPWA applications with low to medium data throughput rates, as well as devices that require long battery lifetimes, such as connected health, smart metering, smart cities and wearables. The modules support handover capability and delivers the technology necessary for use in applications such as vehicle, asset and people tracking where mobility is a pre-requisite. Other applications where the modules are well-suited include and are not limited to: smart home, security systems, industrial monitoring and control. Dual stack IPv4/IPv6 FW update over the air (FOTA) ● ● SARA-R410M-01B North America 13 M1 2,4 5,12 ● ● ● ● ● ● ● ● ● ● North America 13 M1 (E)GPRS 4-band ○ ● ● ○ ○ ● ● 2,4,5 12,13 ● ● ○ ● ● ○ ○ ● ● ● ○ ● ● ○ ○ ● ● ○ ● ● ○ ○ M1 NB1 * Multi Region 13 NB1 * SARA-R412M-02B Multi Region 13 SARA-N410-02B ● ● ○ ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● Automotive Embedded HTTP, FTP ● Professional Embedded TCP/UDP stack ● ● Grade Standard Antenna supervisor ● eDRX ● * Features Power Saving Mode ● Digital audio ● Analog audio ● SARA-R410M-52B Audio GPIOs ● DDC (I2C) 13 SDIO USB 2.0 13 M1 M1 NB1 Interfaces SPI UART USA CellLocate® SARA-R404M SARA-R410M-02B Multi Region 13 Positioning AssistNow software LTE FDD bands Bands GNSS via modem Region 3GPP Release Baseline Model 3GPP LTE category The modules support data communication over an extended operating temperature range of –40 to +85 °C, with extremely low power consumption, and with coverage enhancement for deeper range into buildings and basements (and underground with NB1). * = LTE Cat M1/NB1 Bands may include 1, 2, 3, 4, 5, 8, 12, 13, 17, 18, 19, 20, 25, 26, 28 (and band 39 in M1-only) ● = supported by all FW versions ○ = supported by future FW versions Table 1: SARA-R4/N4 series main features summary UBX-16029218 - R11 System description Page 6 of 116 SARA-R4/N4 series - System Integration Manual SARA-R4/N4 series modules include the following variants / product versions: SARA-R404M LTE Cat M1 module, mainly designed for operation in LTE band 13 SARA-R410M-01B LTE Cat M1 module, mainly designed for operation in LTE bands 2, 4, 5, 12 SARA-R410M-02B LTE Cat M1 / NB1 module, mainly designed for operation in LTE bands 2, 3, 4, 5, 8, 12, 13, 20, 28 SARA-R410M-52B LTE Cat M1 module, mainly designed for operation in LTE bands 2, 4, 5, 12, 13 SARA-R412M-02B LTE Cat M1 / NB1 and 2G module, mainly designed for operation in LTE bands 2, 3, 4, 5, 8, 12, 13, 20 and 2G Quad-band SARA-N410-02B LTE Cat NB1 module, mainly designed for operation in LTE bands 2, 3, 4, 5, 8, 12, 13, 28 Table 2 summarizes cellular radio access technologies characteristics and features of the modules. Item SARA-R404M SARA-R410M SARA-R412M SARA-N410 Protocol stack 3GPP Release 13 3GPP Release 13 3GPP Release 13 3GPP Release 13 RAT LTE Cat M1 Half-Duplex LTE Cat M1 Half-Duplex LTE Cat NB1 Half-Duplex 1 LTE Cat M1 Half-Duplex LTE Cat NB1 Half-Duplex 2G GPRS / EGPRS LTE Cat NB1 Half-Duplex LTE FDD bands Band 13 (750 MHz) Band 12 (700 MHz) Band 13 (750 MHz) Band 20 (800 MHz) Band 5 (850 MHz) Band 8 (900 MHz) Band 4 (1700 MHz) Band 3 (1800 MHz) Band 2 (1900 MHz) Band 12 (700 MHz) Band 28 (700 MHz) Band 13 (750 MHz) Band 20 (800 MHz) Band 5 (850 MHz) Band 8 (900 MHz) Band 4 (1700 MHz) Band 3 (1800 MHz) Band 2 (1900 MHz) LTE TDD bands Band 12 (700 MHz) Band 17 (700 MHz) 1, 2, 3 Band 28 (700 MHz) 1 Band 13 (750 MHz) 1 Band 20 (800 MHz) 1 Band 26 (850 MHz) 1, 2 Band 18 (850 MHz) 1, 2 Band 5 (850 MHz) Band 19 (850 MHz) 1, 2 Band 8 (900 MHz) 1 Band 4 (1700 MHz) Band 3 (1800 MHz) 1 Band 2 (1900 MHz) Band 25 (1900 MHz) 1, 2, 3 Band 1 (2100 MHz) 1 Band 39 (1900 MHz) 3, 4 2G bands GSM 850 MHz E-GSM 900 MHz DCS 1800 MHz PCS 1900 MHz 1 Not supported by the “01” product version. Not supported by the “52” product version. 3 Not supported in signaling mode by the “02” product version 4 Not supported in LTE category NB1. Not supported by the “01” and “52” product versions. 2 UBX-16029218 - R11 System description Page 7 of 116 SARA-R4/N4 series - System Integration Manual Item SARA-R404M SARA-R410M 5 SARA-R412M SARA-N410 LTE category NB1: Class 3 (23 dBm) Power class LTE Cat M1: Class 3 (23 dBm) LTE Cat M1 / NB1 : Class 3 (23 dBm) LTE category M1 / NB1: Class 3 (23 dBm) 2G GMSK: Class 4 (33 dBm) for GSM/E-GSM bands Class 1 (30 dBm) for DCS/PCS bands 2G 8-PSK: Class E2 (27 dBm) for GSM/E-GSM bands Class E2 (26 dBm) for DCS/PCS bands Data rate LTE category M1: up to 375 kb/s UL up to 300 kb/s DL LTE category M1: up to 375 kb/s UL up to 300 kb/s DL LTE category NB15: up to 62.5 kb/s UL up to 27.2 kb/s DL LTE category M1: LTE category NB1: up to 375 kb/s UL up to 62.5 kb/s UL up to 300 kb/s DL up to 27.2 kb/s DL LTE category NB1: up to 62.5 kb/s UL up to 27.2 kb/s DL GPRS multi-slot class 336: Up to 85.6 kb/s UL Up to 107 kb/s DL EGPRS multi-slot class 336: Up to 236.8 kb/s UL Up to 296.0 kb/s DL Table 2: SARA-R4/N4 series modules LTE Cat M1, LTE Cat NB1, EGPRS and GPRS characteristics summary 5 6 Not supported by the “01” product version. GPRS/EGPRS multi-slot class 33 implies a maximum of 5 slots in Down-Link and 4 slots in Up-Link with 6 slots in total. UBX-16029218 - R11 System description Page 8 of 116 SARA-R4/N4 series - System Integration Manual 1.2 Architecture Figure 1 summarizes the internal architecture of SARA-R4/N4 series modules. PA Filter ANT SIM Switch RF transceiver SIM card detection UART USB Memory 19.2 MHz Cellular BaseBand Processor DDC (I2C) SDIO SPI / Digital Audio VCC (Supply) V_INT Reset GPIOs Power Management Antenna detection Power-On Figure 1: SARA-R4/N4 series modules simplified block diagram ☞ SARA-R404M-00B and SARA-R410M-01B modules, i.e. the “00” and “01” product versions of the SARA-R4/N4 series modules, do not support the following interfaces, which should be left unconnected and should not be driven by external devices: o o o o ☞ DDC (I2C) interface SDIO interface SPI interface Digital audio interface SARA-R410M-02B, SARA-R410M-52B, SARA-R412M-02B and SARA-N410-02B modules, i.e. the “02” and “52” product versions of the SARA-R4/N4 series modules, do not support the following interfaces, which should be left unconnected and should not be driven by external devices: o o o SDIO interface SPI interface Digital audio interface UBX-16029218 - R11 System description Page 9 of 116 SARA-R4/N4 series - System Integration Manual 1.3 Pin-out Table 3 lists the pin-out of the SARA-R4/N4 series modules, with pins grouped by function. Function Pin Name Pin No Description Remarks Power VCC 51, 52, 53 I Module supply input VCC supply circuit affects the RF performance and compliance of the device integrating the module with applicable required certification schemes. See section 1.5.1 for functional description / requirements. See section 2.2.1 for external circuit design-in. GND 1, 3, 5, 14, N/A 20-22, 30, 32, 43, 50, 54, 55, 57-61, 63-96 Ground GND pins are internally connected each other. External ground connection affects the RF and thermal performance of the device. See section 1.5.1for functional description. See section 2.2.1 for external circuit design-in. V_INT 4 O Generic digital interfaces supply output V_INT = 1.8 V (typical) generated by internal regulator when the module is switched on, outside the low power PSM deep sleep mode. Test-Point for diagnostic access is recommended. See section 1.5.2 for functional description. See section 2.2.2 for external circuit design-in. PWR_ON 15 I Power-on input Internal 200 k pull-up resistor. Test-Point for diagnostic access is recommended. See section 1.6.1 for functional description. See section 2.3.1 for external circuit design-in. RESET_N 18 I External reset input Internal 37 k pull-up resistor. Test-Point for diagnostic access is recommended. See section 1.6.3 for functional description. See section 2.3.2 for external circuit design-in. ANT 56 I/O Primary antenna Main Tx / Rx antenna interface. 50 nominal characteristic impedance. Antenna circuit affects the RF performance and application device compliance with required certification schemes. See section 1.7 for functional description / requirements. See section 2.4 for external circuit design-in. ANT_DET 62 I Antenna detection ADC for antenna presence detection function See section 1.7.2 for functional description. See section 2.4.2 for external circuit design-in. VSIM 41 O SIM supply output VSIM = 1.8 V / 3 V output as per the connected SIM type. See section 1.8 for functional description. See section 2.5 for external circuit design-in. SIM_IO 39 I/O SIM data Data input/output for 1.8 V / 3 V SIM Internal 4.7 k pull-up to VSIM. See section 1.8 for functional description. See section 2.5 for external circuit design-in. SIM_CLK 38 O SIM clock 4.8 MHz clock output for 1.8 V / 3 V SIM See section 1.8 for functional description. See section 2.5 for external circuit design-in. SIM_RST 40 O SIM reset Reset output for 1.8 V / 3 V SIM See section 1.8 for functional description. See section 2.5 for external circuit design-in. RXD 13 O UART data output 1.8 V output, Circuit 104 (RXD) in ITU-T V.24, for AT commands, data communication, FOAT. See section 1.9.1 for functional description. See section 2.6.1 for external circuit design-in. System Antenna SIM UART UBX-16029218 - R11 I/O System description Page 10 of 116 SARA-R4/N4 series - System Integration Manual Function USB Pin Name Pin No I/O Description Remarks TXD 12 I UART data input 1.8 V input, Circuit 103 (TXD) in ITU-T V.24, for AT commands, data communication, FOAT. Internal pull-down to GND on “00” and R410M-02B versions Internal pull-up to V_INT on other product versions See section 1.9.1 for functional description. See section 2.6.1 for external circuit design-in. CTS 11 O UART clear to send output 1.8 V output, Circuit 106 (CTS) in ITU-T V.24. Not supported by ‘00’, ‘01’ and R410M-02B versions. See section 1.9.1 for functional description. See section 2.6.1 for external circuit design-in. RTS 10 I UART ready to send input 1.8 V input, Circuit 105 (RTS) in ITU-T V.24. Internal active pull-up to V_INT. Not supported by ‘00’, ‘01’ and R410M-02B versions. See section 1.9.1 for functional description. See section 2.6.1 for external circuit design-in. DSR 6 O UART data set ready output 1.8 V, Circuit 107 in ITU-T V.24. See section 1.9.1 for functional description. See section 2.6.1 for external circuit design-in. RI 7 O UART ring indicator output 1.8 V, Circuit 125 in ITU-T V.24. See section 1.9.1 for functional description. See section 2.6.1 for external circuit design-in. DTR 9 I UART data terminal ready input 1.8 V, Circuit 108/2 in ITU-T V.24. Internal active pull-up to V_INT. See section 1.9.1 for functional description. See section 2.6.1 for external circuit design-in. DCD 8 O UART data carrier 1.8 V, Circuit 109 in ITU-T V.24. detect output See section 1.9.1 for functional description. See section 2.6.1 for external circuit design-in. VUSB_DET 17 I USB detect input VBUS (5 V typical) USB supply generated by the host must be connected to this input pin to enable the USB interface. Test-Point for diagnostic / FW update strongly recommended. See section 1.9.2 for functional description. See section 2.6.2 for external circuit design-in. USB_D- 28 I/O USB Data Line D- USB interface for AT commands, data communication, FOAT, FW update by u-blox tool, diagnostics. 90 nominal differential impedance (Z0) 30 nominal common mode impedance (ZCM) Pull-up or pull-down resistors and external series resistors as required by the USB 2.0 specifications [4] are part of the USB pin driver and need not be provided externally. Test-Point for diagnostic / FW update strongly recommended. See section 1.9.2 for functional description. See section 2.6.2 for external circuit design-in. USB_D+ 29 I/O USB Data Line D+ USB interface for AT commands, data communication, FOAT, FW update by u-blox tool, diagnostics. 90 nominal differential impedance (Z0) 30 nominal common mode impedance (ZCM) Pull-up or pull-down resistors and external series resistors as required by the USB 2.0 specifications [4] are part of the USB pin driver and need not be provided externally. Test-Point for diagnostic / FW update strongly recommended. See section 1.9.2 for functional description. See section 2.6.2 for external circuit design-in. UBX-16029218 - R11 System description Page 11 of 116 SARA-R4/N4 series - System Integration Manual Function Pin Name Pin No I/O Description Remarks SPI I2S_WA / SPI_MOSI 34 O SPI MOSI SPI Master Output Slave Input, alternatively configurable as I2S word alignment Not supported by “00”, “01” and “x2” product versions. See section 1.9.3 for functional description. See section 2.6.3 for external circuit design-in. I2S_RXD / SPI_MISO 37 I SPI MISO SPI Master Input Slave Output, alternatively configurable as I2S receive data Not supported by “00”, “01” and “x2” product versions. See section 1.9.3 for functional description. See section 2.6.3 for external circuit design-in. I2S_CLK / SPI_CLK 36 O SPI clock SPI clock, alternatively configurable as I2S clock Not supported by “00”, “01” and “x2” product versions. See section 1.9.3 for functional description. See section 2.6.3 for external circuit design-in. I2S_TXD / SPI_CS 35 O SPI Chip Select SPI Chip Select, alternatively settable as I2S transmit data Not supported by “00”, “01” and “x2” product versions. See section 1.9.3 for functional description. See section 2.6.3 for external circuit design-in. SDIO_D0 47 I/O SDIO serial data [0] Not supported by “00”, “01” and “x2” product versions. See section 1.9.4 for functional description. See section 2.6.4 for external circuit design-in. SDIO_D1 49 I/O SDIO serial data [1] Not supported by “00”, “01” and “x2” product versions. See section 1.9.4 for functional description. See section 2.6.4 for external circuit design-in. SDIO_D2 44 I/O SDIO serial data [2] Not supported by “00”, “01” and “x2” product versions. See section 1.9.4 for functional description. See section 2.6.4 for external circuit design-in. SDIO_D3 48 I/O SDIO serial data [3] Not supported by “00”, “01” and “x2” product versions. See section 1.9.4 for functional description. See section 2.6.4 for external circuit design-in. SDIO_CLK 45 O SDIO serial clock Not supported by “00”, “01” and “x2” product versions. See section 1.9.4 for functional description. See section 2.6.4 for external circuit design-in. SDIO_CMD 46 I/O SDIO command Not supported by “00”, “01” and “x2” product versions. See section 1.9.4 for functional description. See section 2.6.4 for external circuit design-in. SCL 27 O I2C bus clock line 1.8 V open drain, for communication with I2C-slave devices. Internal pull-up to V_INT: external pull-up is not required. Not supported by “00” and “01” product versions. See section 1.9.5 for functional description. See section 2.6.5 for external circuit design-in. SDA 26 I/O I2C bus data line 1.8 V open drain, for communication with I2C-slave devices. Internal pull-up to V_INT: external pull-up is not required. Not supported by “00” and “01” product versions. See section 1.9.5 for functional description. See section 2.6.5 for external circuit design-in. I2S_TXD / SPI_CS 35 O I2S transmit data I2S transmit data, alternatively configurable as SPI Chip Select Not supported by “00”, “01” and “x2” product versions. See section 1.10 for functional description. See section 2.7 for external circuit design-in. I2S_RXD / SPI_MISO 37 I I2S receive data I2S receive data, alternatively configurable as SPI Master Input Slave Output Not supported by “00”, “01” and “x2” product versions. See section 1.10 for functional description. See section 2.7 for external circuit design-in. SDIO DDC Audio UBX-16029218 - R11 System description Page 12 of 116 SARA-R4/N4 series - System Integration Manual Function GPIO Reserved Pin Name Pin No I/O Description Remarks I2S_CLK / SPI_CLK 36 I/O I S clock I2S_WA / SPI_MOSI 34 I/O I2S word alignment I2S word alignment, alternatively configurable as SPI Master Output Slave Input Not supported by “00”, “01” and “x2” product versions. See section 1.10 for functional description. See section 2.7 for external circuit design-in. GPIO1 16 I/O GPIO 1.8 V GPIO with alternatively configurable functions. See section 1.11 for functional description. See section 2.8 for external circuit design-in. GPIO2 23 I/O GPIO 1.8 V GPIO with alternatively configurable functions. See section 1.11 for functional description. See section 2.8 for external circuit design-in. GPIO3 24 I/O GPIO 1.8 V GPIO with alternatively configurable functions. See section 1.11 for functional description. See section 2.8 for external circuit design-in. GPIO4 25 I/O GPIO 1.8 V GPIO with alternatively configurable functions. See section 1.11 for functional description. See section 2.8 for external circuit design-in. GPIO5 42 I/O GPIO 1.8 V GPIO with alternatively configurable functions. See section 1.11 for functional description. See section 2.8 for external circuit design-in. GPIO6 19 I/O GPIO 1.8 V GPIO with alternatively configurable functions. See section 1.11 for functional description. See section 2.8 for external circuit design-in. RSVD 33 N/A Reserved pin This pin can be connected to GND. See sections 1.12 and 2.9 RSVD 2, 31 N/A Reserved pin Leave unconnected. See sections 1.12 and 2.9 2 I2S clock, alternatively configurable as SPI clock Not supported by “00”, “01” and “x2” product versions. See section 1.10 for functional description. See section 2.7 for external circuit design-in. Table 3: SARA-R4/N4 series modules pin definition, grouped by function UBX-16029218 - R11 System description Page 13 of 116 SARA-R4/N4 series - System Integration Manual 1.4 Operating modes SARA-R4/N4 series modules have several operating modes. The operating modes are defined in Table 4 and described in detail in Table 5, providing general guidelines for operation. General Status Operating Mode Power-down Not-Powered Mode VCC supply not present or below operating range: module is switched off. Power-Off Mode Normal Operation Deep-Sleep Mode Definition VCC supply within operating range and module is switched off. RTC runs with 32 kHz reference internally generated. Idle Mode Module processor runs with 32 kHz reference generated by the internal oscillator. Active Mode Module processor runs with 19.2 MHz reference generated by the internal oscillator. Connected Mode RF Tx/Rx data connection enabled and processor core runs with 19.2 MHz reference. Table 4: SARA-R4/N4 series modules operating modes definition Mode Description Transition between operating modes Not-Powered Module is switched off. Application interfaces are not accessible. When VCC supply is removed, the modules enter not-powered mode. When in not-powered mode, the module can enter power-off mode applying VCC supply (see 1.6.1). Power-Off Module is switched off: normal shutdown by The modules enter power-off mode from active mode when the an appropriate power-off event (see 1.6.2). host processor implements a clean switch-off procedure, by sending the AT+CPWROFF command or by using the PWR_ON Application interfaces are not accessible. pin (see 1.6.2). When in power-off mode, the modules can be switched on by the host processor using the PWR_ON input pin (see 1.6.1). When in power-off mode, the modules enter not-powered mode by removing VCC supply. Deep-Sleep Only the internal 32 kHz reference is active. The RF section and the application interfaces are temporarily disabled and switched off: the module is temporarily not ready to communicate with an external device by means of the application interfaces as configured to reduce the current consumption. The module enters the low power deep sleep mode (entering the Power Saving Mode defined in 3GPP Rel.13) whenever possible, if power saving configuration is enabled by AT+CPSMS command (see the SARA-R4/N4 series AT Commands Manual [2]), reducing current consumption (see 1.13.9). Power saving configuration is not enabled by default; it can be enabled by AT+CPSMS (see the SARA-R4/N4 series AT Commands Manual [2]). UBX-16029218 - R11 The modules automatically switch from the active mode to low power deep sleep mode whenever possible, upon expiration of the 6 seconds AT inactivity timer, and upon expiration of “Active Timer”, entering in the Power Saving Mode defined in 3GPP Rel.13, if power saving configuration is enabled (see 1.13.9 and the SARA-R4/N4 series AT Commands Manual [2], AT+CPSMS command). When in low power deep sleep mode, the module switches on to the active mode upon expiration of “Periodic Update Timer” according to the Power Saving Mode defined in 3GPP Rel.13 (see 1.13.9 and the SARA-R4/N4 series AT Commands Manual [2], AT+CPSMS command), or it can be switched on to the active mode by the host processor using the PWR_ON input pin (see section 1.6.1). System description Page 14 of 116 SARA-R4/N4 series - System Integration Manual Mode Description Transition between operating modes Idle Module is switched on with application interfaces temporarily disabled: the module is temporarily not ready to communicate with an external device by means of the application interfaces as configured to reduce the current consumption. The module enters the low power idle mode whenever possible, if low power configuration is enabled by AT+UPSV command (see the SARA-R4/N4 series AT Commands Manual [2]), reducing current consumption. Low power configuration is not enabled by default; it can be enabled by AT+UPSV (see the SARA-R4/N4 series AT Commands Manual [2]). The modules automatically switch from the active mode to low power idle mode whenever possible, upon expiration of the 6 seconds AT inactivity timer, if low power configuration is enabled (see the SARA-R4/N4 series AT Commands Manual [2], AT+UPSV command). When in low power idle mode, the module switches to the active mode upon data reception over UART serial interface. The first character received in low power idle mode wakes up the system: it is not recognized as valid communication character, and the recognition of the subsequent characters is guaranteed only after the complete system wake-up. Active Module is switched on with application interfaces enabled or not suspended: the module is ready to communicate with an external device by means of the application interfaces unless power saving configuration is enabled by AT+CPSMS (see the SARA-R4/N4 series AT Commands Manual [2]). The modules enter active mode from power-off mode when the host processor implements a clean switch-on procedure by using the PWR_ON pin (see 1.6.1). The modules enter active mode from low power deep sleep mode upon expiration of “Periodic Update Timer” (see 1.13.9), or when the host processor implements a clean switch-on procedure by using the PWR_ON pin (see 1.6.1). The modules enter power-off mode from active mode when the host processor implements a clean switch-off procedure (see 1.6.2). The modules automatically switch from active to low power deep sleep mode whenever possible, if power saving is enabled (see 1.13.9). The module switches from active to connected mode when a RF Tx/Rx data connection is initiated or when RF Tx/Rx activity is required due to a connection previously initiated. The module switches from connected to active mode when a RF Tx/Rx data connection is terminated or suspended. Connected RF Tx/Rx data connection is in progress. The module is prepared to accept data signals from an external device. When a data connection is initiated, the module enters connected mode from active mode. Connected mode is suspended if Tx/Rx data is not in progress. In such cases the module automatically switches from connected to active mode and then, if power saving configuration is enabled by the AT+CPSMS command, the module automatically switches to low power deep sleep mode whenever possible. Viceversa, the module wakes up from low power deep sleep mode to active mode and then connected mode if RF Tx/Rx activity is necessary. When a data connection is terminated, the module returns to the active mode. Table 5: SARA-R4/N4 series modules operating modes description UBX-16029218 - R11 System description Page 15 of 116 SARA-R4/N4 series - System Integration Manual Figure 2 describes the transition between the different operating modes. Not powered Apply VCC Remove VCC Power off Switch ON: • PWR_ON Switch OFF: • AT+CPWROFF • PWR_ON Incoming/outgoing data or other dedicated device network communication Connected If PSM mode is enabled, if AT Inactivity Timer and Active Timer are expired Active No RF Tx/Rx in progress, Communication dropped Deep Sleep • Upon expiration of the Periodic Update Timer • Using PWR_ON pin If low power mode is enabled, if AT Inactivity Timer is expired Data received over UART Idle Figure 2: SARA-R4/N4 series modules operating modes transitions UBX-16029218 - R11 System description Page 16 of 116 SARA-R4/N4 series - System Integration Manual 1.5 Supply interfaces 1.5.1 Module supply input (VCC) The modules must be supplied via the three VCC pins that represent the module power supply input. Voltage must be stable, because during operation, the current drawn by the SARA-R4/N4 series modules through the VCC pins can vary by several orders of magnitude, depending on the operating mode and state (as described in sections 1.5.1.2, 1.5.1.3, 1.5.1.4 and 1.5.1.6). It is important that the supply source is able to withstand both the maximum pulse current occurring during a transmit burst at maximum power level and the average current consumption occurring during Tx / Rx call at maximum RF power level (see the SARA-R4 Data Sheet [1]). SARA-R412M modules provide separate supply inputs over the three VCC pins: VCC pins #52 and #53 represent the supply input for the internal RF power amplifier, demanding most of the total current drawn of the module when RF transmission is enabled during a call VCC pin #51 represents the supply input for the internal baseband Power Management Unit, demanding minor part of the total current drawn of the module when RF transmission is enabled during a call The 3 VCC pins of SARA-R404M, SARA-R410M, SARA-N410 modules are internally connected each other to both the internal RF Power Amplifier and the internal baseband Power Management Unit. Figure 3 provides a simplified block diagram of SARA-R4/N4 series modules’ internal VCC supply routing. SARA-R404M / SARA-R410M / SARA-N410 Power Amplifier VCC 53 VCC 52 VCC 51 Transceiver Power Management Unit Baseband Processor SARA-R412M Power Amplifier VCC 53 VCC 52 VCC 51 Transceiver Power Management Unit Memory Baseband Processor Memory Figure 3: Block diagram of SARA-R4/N4 series modules’ internal VCC supply routing UBX-16029218 - R11 System description Page 17 of 116 SARA-R4/N4 series - System Integration Manual 1.5.1.1 VCC supply requirements Table 6 summarizes the requirements for the VCC modules supply. See section 2.2.1 for suggestions to correctly design a VCC supply circuit compliant with the requirements listed in Table 6. ⚠ The supply circuit affects the RF compliance of the device integrating SARA-R4/N4 series modules with applicable required certification schemes as well as antenna circuit design. Compliance is guaranteed if the requirements summarized in the Table 6 are fulfilled. Item Requirement Remark VCC nominal voltage Within VCC normal operating range: SARA-R404M / SARA-R410M / SARA-N410: 3.2 V / 4.2 V SARA-R412M: 3.2 V / 4.5 V RF performance is guaranteed when VCC voltage is inside the normal operating range limits. RF performance may be affected when VCC voltage is outside the normal operating range limits, though the module is still fully functional until the VCC voltage is inside the extended operating range limits. VCC voltage during normal operation VCC voltage must be above the extended operating range minimum limit to switch-on the module. The module may switch-off when the VCC voltage drops below the extended operating range minimum limit. Operation above VCC extended operating range is not recommended and may affect device reliability. Within VCC extended operating range: SARA-R404M / SARA-R410M / SARA-N410: 3.0 V / 4.2 V SARA-R412M: 3.0 V / 4.5 V VCC average current Support with adequate margin the highest averaged VCC current consumption value in connected mode conditions specified in the SARA-R4/N4 series Data Sheet [1] The maximum average current consumption can be greater than the specified value according to the actual antenna mismatching, temperature and supply voltage. Section 1.5.1.2 describes current consumption profiles in connected mode. VCC peak current Support with adequate margin the highest peak VCC current consumption value in Tx connected mode conditions specified in the SARA-R4/N4 series Data Sheet [1] The maximum peak Tx current consumption can be greater than the specified value according to the actual antenna mismatching, temperature and supply voltage. Section 1.5.1.2 describes current consumption profiles in connected mode. VCC voltage drop during Tx slots Lower than 400 mV VCC voltage drop directly affects the RF compliance with applicable certification schemes. Figure 6 describes VCC voltage drop during 2G Tx slots. VCC voltage ripple during Tx Noise in the supply pins must be minimized High supply voltage ripple values during RF transmissions in connected mode directly affect the RF compliance with the applicable certification schemes. VCC under/overAbsent or at least minimized shoot at start/end of Tx slots VCC under/over-shoot directly affects the RF compliance with applicable certification schemes. Figure 6 describes VCC voltage under/over-shoot. Table 6: Summary of VCC modules supply requirements UBX-16029218 - R11 System description Page 18 of 116 SARA-R4/N4 series - System Integration Manual 1.5.1.2 VCC current consumption in LTE connected mode During an LTE connection, the SARA-R4/N4 series modules transmit and receive in half duplex mode. The current consumption depends on output RF power, which is always regulated by the network (the current base station) sending power control commands to the module. These power control commands are logically divided into a slot of 0.5 ms (time length of one Resource Block), thus the rate of power change can reach a maximum rate of 2 kHz. Figure 4 shows an example of SARA-R4/N4 series modules’ current consumption profile versus time in connected mode: transmission is enabled for one sub-frame (1 ms) according to LTE Category M1 half-duplex connected mode. Detailed current consumption values can be found in the SARA-R4/N4 series Data Sheet [1]. Current [mA] 500 400 300 Current consumption value depends on TX power and actual antenna load 200 100 0 1 Slot 1 Resource Block (0.5 ms) 1 LTE Radio Frame (10 ms) 1 Slot 1 Resource Block (0.5 ms) 1 LTE Radio Frame (10 ms) Time [ms] Figure 4: VCC current consumption profile versus time during LTE Cat M1 half-duplex connection 1.5.1.3 VCC current consumption in 2G connected mode When a 2G call is established, the VCC consumption is determined by the current consumption profile typical of the 2G transmitting and receiving bursts. The current consumption peak during a transmission slot is strictly dependent on the transmitted power, which is regulated by the network. The transmitted power in the transmit slot is also the more relevant factor for determining the average current consumption. If the module is transmitting in 2G single-slot mode in the 850 or 900 MHz bands at the maximum RF power control level (approximately 2 W or 33 dBm in the Tx slot/burst), then the current consumption can reach a high peak / pulse (see the SARA-R4/N4 series Data Sheet [1]) for 576.9 µs (width of the transmit slot/burst) with a periodicity of 4.615 ms (width of 1 frame = 8 slots/burst), that is, with a 1/8 duty cycle according to GSM TDMA (Time Division Multiple Access). If the module is transmitting in 2G single-slot mode in the 1800 or 1900 MHz bands, the current consumption figures are much lower than during transmission in the low bands, due to the 3GPP transmitter output power specifications. During a 2G call, current consumption is not significantly high while receiving or in monitor bursts, and it is low in the bursts unused to transmit / receive. UBX-16029218 - R11 System description Page 19 of 116 SARA-R4/N4 series - System Integration Manual Figure 5 shows an example of the module current consumption profile versus time in 2G single-slot. Current [A] 2.0 1900 mA 1.5 Peak current depends on TX power and actual antenna load 1.0 0.5 60-120 mA 0.0 RX slot 200 mA 60-120 mA 10-40 mA unused unused slot slot TX slot unused unused MON unused slot slot slot slot RX slot unused unused slot slot GSM frame 4.615 ms (1 frame = 8 slots) TX slot unused unused MON unused slot slot slot slot Time [ms] GSM frame 4.615 ms (1 frame = 8 slots) Figure 5: VCC current consumption profile versus time during a GSM call (1 TX slot, 1 RX slot) Figure 6 illustrates the VCC voltage profile versus time during a 2G single-slot call, according to the related VCC current consumption profile described in Figure 5. Voltage overshoot 3.8 V (typ) drop ripple RX slot unused unused slot slot TX slot unused unused MON unused slot slot slot slot GSM frame 4.615 ms (1 frame = 8 slots) undershoot RX slot unused unused slot slot TX slot unused unused MON unused slot slot slot slot GSM frame 4.615 ms (1 frame = 8 slots) Time Figure 6: Description of the VCC voltage profile versus time during a 2G single-slot call (1 TX slot, 1 RX slot) When a GPRS connection is established, more than one slot can be used to transmit and/or more than one slot can be used to receive. The transmitted power depends on network conditions, which set the peak current consumption. But according to GPRS specifications, the maximum transmitted RF power is reduced if more than one slot is used to transmit, so the maximum peak of current is not as high as it can be in the case of a GSM call. If the module transmits in GPRS multi-slot class 12, in 850 or 900 MHz bands, at maximum RF power level, the consumption can reach a quite a high peak but lower than the one achievable in 2G singleslot mode. This happens for 2.308 ms (width of the 4 Tx slots/bursts) in the case of multi-slot class 12, with a periodicity of 4.615 ms (width of 1 frame = 8 slots/bursts), so with a 1/2 duty cycle, according to GSM TDMA. If the module is in GPRS connected mode in the 1800 or 1900 MHz bands, consumption figures are lower than in the 850 or 900 MHz band because of the 3GPP Tx power specifications. UBX-16029218 - R11 System description Page 20 of 116 SARA-R4/N4 series - System Integration Manual Figure 7 illustrates the current consumption profiles in GPRS connected mode, in 850 or 900 MHz bands, with 4 slots used to transmit and 1 slot used to receive, as for the GPRS multi-slot class 12. Current [A] 1600 mA 1.5 Peak current depends on TX power and actual antenna load 1.0 0.5 200mA 60-120mA 0.0 60-120mA 10-40mA RX slot unused slot TX slot TX slot TX slot TX slot GSM frame 4.615 ms (1 frame = 8 slots) MON unused slot slot RX slot unused slot TX slot TX slot TX slot TX slot GSM frame 4.615 ms (1 frame = 8 slots) MON unused slot slot Time [ms] Figure 7: VCC current consumption profile versus time during a GPRS multi-slot class 12 connection (4 TX slots, 1 RX slot) In case of EGPRS (i.e. EDGE) connections, the VCC current consumption profile is very similar to the one during GPRS connections: the current consumption profile in GPRS multi-slot class 12 connected mode illustrated in the Figure 7 is representative for the EDGE multi-slot class 12 connected mode as well. 1.5.1.4 VCC current consumption in low power deep sleep mode (PSM enabled) The power saving mode configuration is by default disabled, but it can be enabled using the AT+CPSMS command (see the SARA-R4/N4 series AT Commands Manual [2] and section 1.13.9). When power saving mode is enabled, the module automatically enters the PSM low power deep sleep mode whenever possible, reducing current consumption down to a steady value in the µA range: only the RTC runs with internal 32 kHz reference clock frequency. Detailed current consumption values can be found in the SARA-R4/N4 series Data Sheet [1]. ☞ Due to RTC running during PSM mode, the Cal-RC turns on the crystal every ~10 s to calibrate the RC oscillator, as a consequence, a very low spike in current consumption will be observed. 1.5.1.5 VCC current consumption in low power idle mode (low power enabled) The low power idle mode configuration is by default disabled, but it can be enabled using the AT+UPSV command (see the SARA-R4/N4 series AT Commands Manual [2]). When low power idle mode is enabled, the module automatically enters the low power mode whenever possible, but it must periodically monitor the paging channel of the current base station (paging block reception), in accordance to the 2G / LTE system requirements, even if connected mode is not enabled by the application. When the module monitors the paging channel, it wakes up to the active mode to enable the reception of the paging block. In between, the module switches to low power mode. This is known as discontinuous reception (DRX) or extended discontinuous reception (eDRX). Detailed current consumption values can be found in the SARA-R4/N4 series Data Sheet [1]. UBX-16029218 - R11 System description Page 21 of 116 SARA-R4/N4 series - System Integration Manual 1.5.1.6 VCC current consumption in active mode (PSM / low power disabled) The active mode is the state where the module is switched on and ready to communicate with an external device by means of the application interfaces (as the USB or the UART serial interface). The module processor core is active, and the 19.2 MHz reference clock frequency is used. If power saving mode and/or low power mode configurations are disabled, as it is by default (see the SARA-R4/N4 series AT Commands Manual [2], +CPSMS, +UPSV AT commands for details), the module remains in active mode. Otherwise, if PSM mode and/or low power mode configurations are enabled, the module enters PSM mode and/or low power mode whenever possible. Figure 8 illustrates a typical example of the module current consumption profile when the module is in active mode. In such case, the module is registered with the network and, while active mode is maintained, the receiver is periodically activated to monitor the paging channel for paging block reception. Detailed current consumption values can be found in the SARA-R4/N4 series Data Sheet [1]. Current [mA] 100 0 Current [mA] Time [s] Paging period 100 0 Time [ms] RX Enabled ACTIVE MODE Figure 8: VCC current consumption profile with power saving disabled and module registered with the network: active mode is always held and the receiver is periodically activated to monitor the paging channel for paging block reception 1.5.2 Generic digital interfaces supply output (V_INT) The V_INT output pin of the SARA-R4/N4 series modules is generated by the module internal power management circuitry when the module is switched on and it is not in the deep sleep power saving mode. The typical operating voltage is 1.8 V, whereas the current capability is specified in the SARA-R4/N4 series Data Sheet [1]. The V_INT voltage domain can be used in place of an external discrete regulator as a reference voltage rail for external components. UBX-16029218 - R11 System description Page 22 of 116 SARA-R4/N4 series - System Integration Manual 1.6 System function interfaces 1.6.1 Module power-on When the SARA-R4/N4 series modules are in the not-powered mode (i.e. the VCC module supply is not applied), they can be switched on as follows: Rising edge on the VCC input pins to a valid voltage level, and then a low logic level needs to be set at the PWR_ON input pin for a valid time. When the SARA-R4/N4 series modules are in the power-off mode (i.e. switched off) or in the Power Saving Mode (PSM), with a valid VCC supply applied, they can be switched on as follows: Low pulse on the PWR_ON pin for a valid time period The PWR_ON input pin is equipped with an internal active pull-up resistor. Detailed electrical characteristics with voltages and timings are described in the SARA-R4/N4 series Data Sheet [1]. Figure 9 shows the module switch-on sequence from the not-powered mode, with following phases: The external power supply is applied to the VCC module pins The PWR_ON pin is held low for a valid time All the generic digital pins are tri-stated until the switch-on of their supply source (V_INT). The internal reset signal is held low: the baseband core and all digital pins are held in reset state. When the internal reset signal is released, any digital pin is set in the correct sequence from the reset state to the default operational configured state. The duration of this phase differs within generic digital interfaces and USB interface due to host / device enumeration timings. The module is fully ready to operate after all interfaces are configured. Start-up event Start of interface configuration Module interfaces are configured VCC PWR_ON RESET_N V_INT Internal Reset GPIO OFF System State BB Pads State Tristate / Floating ON Internal Reset Internal Reset → Operational 0s Operational ~4.5 s Figure 9: SARA-R4/N4 series switch-on sequence description ☞ The Internal Reset signal is not available on a module pin, but it is highly recommended to monitor: o the V_INT pin, to sense the start of the SARA-R4/N4 series module switch-on sequence o the GPIO pin configured to provide the module operating status indication (see SARA-R4/N4 series Commands Manual [2], AT+UGPIOC), to sense when the module is ready to operate ☞ Before the switch-on of the generic digital interface supply (V_INT) of the module, no voltage driven by an external application should be applied to any generic digital interface of the module. ☞ Before the SARA-R4/N4 series module is fully ready to operate, the host application processor should not send any AT command over AT communication interfaces (USB, UART) of the module. UBX-16029218 - R11 System description Page 23 of 116 SARA-R4/N4 series - System Integration Manual ☞ The duration of the SARA-R4/N4 series modules’ switch-on routine can vary depending on the application / network settings and the concurrent module activities. ⚠ An abrupt removal of the VCC supply or forcing a low level on the RESET_N input once the boot of SARA-R4/N4 series modules has been triggered may lead to an unrecoverable faulty state! 1.6.2 Module power-off SARA-R4/N4 series modules can be cleanly switched off by: AT+CPWROFF command (see SARA-R4/N4 series AT Commands Manual [2]). Low pulse on the PWR_ON pin for a valid time period (see the SARA-R4/N4 series Data Sheet [1]). These events listed above trigger the storage of the current parameter settings in the non-volatile memory of the module, and a clean network detach procedure. An abrupt under-voltage shutdown occurs on SARA-R4/N4 series modules when the VCC module supply is removed. If this occurs, it is not possible to perform the storing of the current parameter settings in the module’s non-volatile memory or to perform the clean network detach. ☞ It is highly recommended to avoid an abrupt removal of the VCC supply during SARA-R4/N4 series modules normal operations. ⚠ An abrupt removal of the VCC supply during SARA-R4/N4 series modules normal operations may lead to an unrecoverable faulty state! An abrupt hardware shutdown occurs on SARA-R4/N4 series modules when a low level is applied on RESET_N pin. In this case, the current parameter settings are not saved in the module’s non-volatile memory and a clean network detach is not performed. ☞ It is highly recommended to avoid an abrupt hardware shutdown of the module by forcing a low level on the RESET_N input pin during module normal operation: the RESET_N line should be set low only if reset or shutdown via AT commands fails or if the module does not reply to a specific AT command after a time period longer than the one defined in SARA-R4/N4 series AT Commands Manual [2]. ⚠ Forcing a low level on the RESET_N input during SARA-R4/N4 series modules normal operations may lead to an unrecoverable faulty state! UBX-16029218 - R11 System description Page 24 of 116 SARA-R4/N4 series - System Integration Manual Figure 10 and Figure 11 describe the SARA-R4/N4 series modules switch-off sequence started by means of the AT+CPWROFF command and by means of the PWR_ON input pin respectively, allowing storage of current parameter settings in the module’s non-volatile memory and a clean network detach, with the following phases: When the +CPWROFF AT command is sent, or when a low pulse with appropriate time duration (see the SARA-R4/N4 series Data Sheet [1]) is applied at the PWR_ON input pin, the module starts the switch-off routine. Then, if the +CPWROFF AT command has been sent, the module replies OK on the AT interface: the switch-off routine is in progress. At the end of the switch-off routine, all the digital pins are tri-stated and all the internal voltage regulators are turned off, including the generic digital interfaces supply (V_INT). Then, the module remains in switch-off mode as long as a switch on event does not occur (e.g. applying a low level to PWR_ON), and enters not-powered mode if the VCC supply is removed. AT+CPWROFF sent to the module OK replied by the module VCC can be removed VCC PWR_ON RESET_N V_INT Internal Reset ON System State BB Pads State Operational OFF Operational → Tristate Tristate / Floating Figure 10: SARA-R4/N4 series modules switch-off sequence by means of AT+CPWROFF command VCC can be removed The module starts the switch-off routine VCC PWR_ON RESET_N V_INT Internal Reset ON System State BB Pads State Operational OFF Operational -> Tristate Tristate / Floating 0 s modules switch-off ~2.5 s ~5 sby means of PWR_ON pin Figure 11: SARA-R4/N4 series sequence ☞ The Internal Reset signal is not available on a module pin, but it is highly recommended to monitor the V_INT pin to sense the end of the switch-off sequence. ⚠ VCC supply can be removed only after V_INT goes low: an abrupt removal of the VCC supply during SARA-R4/N4 series modules normal operations may lead to an unrecoverable faulty state! ☞ The duration of each phase in the SARA-R4/N4 series modules’ switch-off routines can largely vary depending on the application / network settings and the concurrent module activities. UBX-16029218 - R11 System description Page 25 of 116 SARA-R4/N4 series - System Integration Manual 1.6.3 Module reset SARA-R4/N4 series modules can be cleanly reset (rebooted) by: AT+CFUN command (see the SARA-R4/N4 series AT Commands Manual [2]). In the case above an “internal” or “software” reset of the module is executed: the current parameter settings are saved in the module’s non-volatile memory and a clean network detach is performed. An abrupt hardware shutdown occurs on SARA-R4/N4 series modules when a low level is applied on RESET_N input pin for a valid time period. In this case, the current parameter settings are not saved in the module’s non-volatile memory and a clean network detach is not performed. Then, the module remains in power-off mode as long as a switch on event does not occur applying an appropriate low level to the PWR_ON input. ☞ It is highly recommended to avoid an abrupt hardware shutdown of the module by forcing a low level on the RESET_N input during modules normal operation: the RESET_N line should be set low only if reset or shutdown via AT commands fails or if the module does not provide a reply to a specific AT command after a time period longer than the one defined in the SARA-R4/N4 series AT Commands Manual [2]. ⚠ Forcing a low level on the RESET_N input during SARA-R4/N4 series modules normal operations may lead to an unrecoverable faulty state! The RESET_N input pin is directly connected to the Power Management Unit IC, with an integrated pull-up to a 1.8 V supply domain, in order to perform an abrupt hardware shutdown when asserted. Detailed electrical characteristics with voltages and timings are described in the SARA-R4/N4 series Data Sheet [1]. SARA-R4/N4 Power Management Unit 1.8V RESET_N 18 Reset Shutdown Figure 12: RESET_N input description UBX-16029218 - R11 System description Page 26 of 116 SARA-R4/N4 series - System Integration Manual 1.7 Antenna interface 1.7.1 Antenna RF interface (ANT) SARA-R4/N4 series modules provide an RF interface for connecting the external antenna. The ANT pin represents the primary RF input/output for transmission and reception of LTE RF signals. The ANT pin has a nominal characteristic impedance of 50 and must be connected to the primary Tx / Rx antenna through a 50 transmission line to allow clear RF transmission and reception. 1.7.1.1 Antenna RF interfaces requirements Table 7 summarizes the requirements for the antenna RF interface. See section 2.4.1 for suggestions to correctly design antennas circuits compliant with these requirements. ⚠ The antenna circuits affect the RF compliance of the device integrating SARA-R4/N4 series modules with applicable required certification schemes (for more details see section 4). Compliance is guaranteed if the antenna RF interface requirements summarized in Table 7 are fulfilled. Item Requirements Remarks Impedance 50 nominal characteristic impedance The impedance of the antenna RF connection must match the 50 impedance of the ANT port. Frequency Range See the SARA-R4/N4 series Data Sheet [1] The required frequency range of the antenna connected to ANT port depends on the operating bands of the used cellular module and the used mobile network. Return Loss S11 < -10 dB (VSWR < 2:1) recommended S11 < -6 dB (VSWR < 3:1) acceptable The Return loss or the S11, as the VSWR, refers to the amount of reflected power, measuring how well the antenna RF connection matches the 50 characteristic impedance of the ANT port. The impedance of the antenna termination must match as much as possible the 50 nominal impedance of the ANT port over the operating frequency range, reducing as much as possible the amount of reflected power. Efficiency > -1.5 dB ( > 70% ) recommended > -3.0 dB ( > 50% ) acceptable The radiation efficiency is the ratio of the radiated power to the power delivered to antenna input: the efficiency is a measure of how well an antenna receives or transmits. The radiation efficiency of the antenna connected to the ANT port needs to be enough high over the operating frequency range to comply with the Over-The-Air (OTA) radiated performance requirements, as Total Radiated Power (TRP) and the Total Isotropic Sensitivity (TIS), specified by applicable related certification schemes. Maximum Gain According to radiation exposure limits The power gain of an antenna is the radiation efficiency multiplied by the directivity: the gain describes how much power is transmitted in the direction of peak radiation to that of an isotropic source. The maximum gain of the antenna connected to ANT port must not exceed the herein stated value to comply with regulatory agencies radiation exposure limits. For additional info see sections 4.2.2. Input Power > 24 dBm ( > 0.25 W ) for R404M / R410M / N410 > 33 dBm ( > 2.0 W ) for R412M The antenna connected to the ANT port must support with adequate margin the maximum power transmitted by the modules. Table 7: Summary of Tx/Rx antenna RF interface requirements UBX-16029218 - R11 System description Page 27 of 116 SARA-R4/N4 series - System Integration Manual 1.7.2 Antenna detection interface (ANT_DET) The antenna detection is based on ADC measurement. The ANT_DET pin is an Analog to Digital Converter (ADC) provided to sense the antenna presence. The antenna detection function provided by ANT_DET pin is an optional feature that can be implemented if the application requires it. The antenna detection is forced by the +UANTR AT command. See the SARA-R4/N4 series AT Commands Manual [2] for more details on this feature. The ANT_DET pin generates a DC current (for detailed characteristics see the SARA-R4/N4 series Data Sheet [1]) and measures the resulting DC voltage, thus determining the resistance from the antenna connector provided on the application board to GND. So, the requirements to achieve antenna detection functionality are the following: an RF antenna assembly with a built-in resistor (diagnostic circuit) must be used an antenna detection circuit must be implemented on the application board See section 2.4.2 for antenna detection circuit on application board and diagnostic circuit on antenna assembly design-in guidelines. 1.8 SIM interface 1.8.1 SIM interface SARA-R4/N4 series modules provide high-speed SIM/ME interface including automatic detection and configuration of the voltage required by the connected SIM card or chip. Both 1.8 V and 3 V SIM types are supported. Activation and deactivation with automatic voltage switch from 1.8 V to 3 V are implemented, according to ISO-IEC 7816-3 specifications. The VSIM supply output provides internal short circuit protection to limit start-up current and protect the SIM to short circuits. The SIM driver supports the PPS (Protocol and Parameter Selection) procedure for baud-rate selection, according to the values determined by the SIM card or chip. 1.8.2 SIM detection interface The GPIO5 pin is configured as an external interrupt to detect the SIM card mechanical / physical presence. The pin is configured as input with an internal active pull-down enabled, and it can sense SIM card presence only if cleanly connected to the mechanical switch of a SIM card holder as described in section 2.5: Low logic level at GPIO5 input pin is recognized as SIM card not present High logic level at GPIO5 input pin is recognized as SIM card present For more details, see the SARA-R4/N4 series AT Commands Manual [2], +UGPIOC, +CIND and +CMER AT commands. UBX-16029218 - R11 System description Page 28 of 116 SARA-R4/N4 series - System Integration Manual 1.9 Data communication interfaces SARA-R4/N4 series modules provide the following serial communication interface: USB interface: Universal Serial Bus 2.0 compliant interface available for the communication with a host application processor (AT commands, data, FW update by means of the FOAT feature), for FW update by means of the u-blox dedicated tool and for diagnostics. See section 1.9.2. SPI interface: Serial Peripheral Interface available for communication with an external compatible device. See section 1.9.3. SDIO interface: Secure Digital Input Output interface available for communication with a compatible device. See section 1.9.4. DDC interface: I2C bus compatible interface available for the communication with u-blox GNSS positioning chips or modules and with external I2C devices. See section 1.9.5. 1.9.1 UART interface 1.9.1.1 UART features The UART interface is a 9-wire 1.8 V unbalanced asynchronous serial interface available on all the SARA-R4/N4 series modules, supporting: ☞ AT command mode7 Data mode and Online command mode7 Multiplexer protocol functionality FW upgrades by means of the FOAT feature (see 1.13.7) The UART is available only if the USB is not enabled as AT command / data communication interface: UART and USB cannot be concurrently used for this purpose. UART interface provides RS-232 functionality conforming to the ITU-T V.24 Recommendation [5], with CMOS compatible signal levels: 0 V for low data bit or ON state, and 1.8 V for high data bit or OFF state (for electrical characteristics see the SARA-R4/N4 series Data Sheet [1]), providing: data lines (RXD as output, TXD as input) hardware flow control lines (CTS as output, RTS as input) modem status and control lines (DTR as input, DSR as output, DCD as output, RI as output) SARA-R4/N4 series modules are designed to operate as cellular modems, i.e. as the data circuitterminating equipment (DCE) according to the ITU-T V.24 Recommendation [5]. A host application processor connected to the module UART interface represents the data terminal equipment (DTE). ☞ UART signal names of the cellular modules conform to the ITU-T V.24 Recommendation [5]: e.g. TXD line represents data transmitted by the DTE (host processor output) and received by the DCE (module input). ☞ Hardware flow control is not supported by the “00”, “01” and SARA-R410M-02B product versions, but the RTS input line of the module must be set low (= ON state) to communicate over UART interface on the “00” and “01” product versions. ☞ DTR input of the module must be set low (= ON state) to have URCs presented over UART interface. 7 For the definition of the interface data mode, command mode and online command mode see SARA-R4/N4 series AT Commands Manual [1] UBX-16029218 - R11 System description Page 29 of 116 SARA-R4/N4 series - System Integration Manual SARA-R4/N4 series modules’ UART interface is by default configured in AT command mode, if the USB interface is not enabled as AT command / data communication interface (UART and USB cannot be concurrently used for this purpose): the module waits for AT command instructions and interprets all the characters received as commands to execute. All the functionalities supported by SARA-R4/N4 series modules can be in general set and configured by AT commands: AT commands according to 3GPP TS 27.007 [6], 3GPP TS 27.005 [7], 3GPP TS 27.010 [8] u-blox AT commands (see the SARA-R4/N4 series AT Commands Manual [2]) The default baud rate is 115200 b/s, while the default frame format is 8N1 (8 data bits, No parity, 1 stop bit: see Figure 13). Baud rates can be configured by AT command (see the SARA-R4/N4 series AT Commands Manual [2]). ☞ Automatic baud rate detection and automatic frame format recognition are not supported. Normal Transfer, 8N1 Start of 1-Byte transfer D0 D1 Possible Start of next transfer D2 D3 D4 D5 Start Bit (Always 0) D6 D7 Stop Bit (Always 1) tbit = 1/(Baudrate) Figure 13: Description of UART 8N1 frame format (8 data bits, no parity, 1 stop bit) 1.9.1.2 UART signals behavior At the end of the module boot sequence (see Figure 9), the module is by default in active mode, and the UART interface is initialized and enabled as AT commands interface only if the USB interface is not enabled as AT command / data communication interface: UART and USB cannot be concurrently used for this purpose. The configuration and the behavior of the UART signals after the boot sequence are described below: The module data output line (RXD) is set by default to the OFF state (high level) at UART initialization. The module holds RXD in the OFF state until the module transmits some data. The module data input line (TXD) is assumed to be controlled by the external host once UART is initialized and if UART is used in the application. The TXD data input line has an internal active pull-down enabled on the “00” and SARA-R410M-02B product versions, and an internal active pull-up enabled on the other product version. 1.9.1.3 UART multiplexer protocol SARA-R4/N4 series modules include multiplexer functionality as per 3GPP TS 27.010 [8], on the UART physical link. This is a data link protocol which uses HDLC-like framing and operates between the module (DCE) and the application processor (DTE) and allows a number of simultaneous sessions over the used physical link (UART). The following virtual channels are defined: Channel 0: for Multiplexer control Channel 1: for all AT commands, and non-Dial Up Network (non-DUN) data connections. UDP, TCP data socket / data call connections via relevant AT commands. Channel 2: for Dial Up Network (DUN) data connection. It requires the host to have and use its own TCP/IP stack. The DUN can be initiated on modem side or terminal/host side. Channel 3: for u-blox GNSS data tunneling (not supported by “00” and “01” product versions). UBX-16029218 - R11 System description Page 30 of 116 SARA-R4/N4 series - System Integration Manual 1.9.2 USB interface 1.9.2.1 USB features SARA-R4/N4 series modules include a High-Speed USB 2.0 compliant interface with 480 Mb/s maximum data rate, representing the main interface for transferring high speed data with a host application processor, supporting: AT command mode8 Data mode and Online command mode8 FW upgrades by means of the FOAT feature (see 1.13.7) FW upgrades by means of the u-blox EasyFlash dedicated tool Trace log capture (diagnostic purposes) The module itself acts as a USB device and can be connected to a USB host such as a Personal Computer or an embedded application microprocessor equipped with compatible drivers. The USB_D+/USB_D- lines carry USB serial bus data and signaling according to the Universal Serial Bus Revision 2.0 specification [4], while the VUSB_DET input pin senses the VBUS USB supply presence (nominally 5 V at the source) to detect the host connection and enable the interface. Neither the USB interface, nor the whole module is supplied by the VUSB_DET input, which senses the USB supply voltage and absorbs few microamperes. ☞ The USB interface is available as AT command / data communication interface only if an external valid USB VBUS supply voltage (5.0 V typical) is applied at the VUSB_DET input of the module since the switch-on of the module, and then held during normal operations. In this case, the UART will be not available. ☞ If the USB interface is enabled, the module does not enter the low power deep sleep mode: the external USB VBUS supply voltage needs to be removed from the VUSB_DET input of the module to let it enter the Power Saving Mode defined in 3GPP Rel.13. The USB interface is controlled and operated with: AT commands according to 3GPP TS 27.007 [6], 3GPP TS 27.005 [7] u-blox AT commands (see the SARA-R4/N4 series AT Commands Manual [2]) The USB interface of SARA-R4/N4 series modules can provide the following USB functions: AT commands and data communication Diagnostic log The USB profile of SARA-R4/N4 series modules identifies itself by the following VID (Vendor ID) and PID (Product ID) combination, included in the USB device descriptor according to the USB 2.0 specifications [4]. VID = 0x05C6 PID = 0x90B2 8 For the definition of the interface data mode, command mode and online command mode see SARA-R4/N4 series AT Commands Manual [2] UBX-16029218 - R11 System description Page 31 of 116 SARA-R4/N4 series - System Integration Manual 1.9.3 ☞ SPI interface The SPI interface is not supported by “00”, “01”, “02” and “52” product versions: the SPI interface pins should not be driven by any external device. SARA-R4/N4 series modules include a Serial Peripheral Interface for communication with compatible external device. The SPI interface can be made available as alternative function, in mutually exclusive way, over the digital audio interface pins (I2S_WA / SPI_MOSI, I2S_RXD / SPI_MISO, I2S_CLK / SPI_CLK, I2S_TXD / SPI_CS). 1.9.4 ☞ SDIO interface The SDIO interface is not supported by “00”, “01”, “02” and “52” product versions: the SDIO interface pins should not be driven by any external device. SARA-R4/N4 series modules include a 4-bit Secure Digital Input Output interface (SDIO_D0, SDIO_D1, SDIO_D2, SDIO_D3, SDIO_CLK, and SDIO_CMD) designed to communicate with external compatible SDIO devices. 1.9.5 ☞ DDC (I2C) interface The I2C interface is not supported by “00” and “01” product versions: the I 2C interface pins should not be driven by any external device. SARA-R4/N4 series modules include an I2C-bus compatible DDC interface (SDA, SCL lines) available to communicate with a u-blox GNSS receiver and with external I2C devices as an audio codec: the SARA-R4/N4 series module acts as an I2C master which can communicate with I2C slaves in accordance with the I2C bus specifications [9]. The SDA and SCL pins have internal pull-up to V_INT, so there is no need of additional pull-up resistors on the external application board. 1.10 Audio ☞ Audio is not supported by “00”, “01”, “02” and “52” ” product versions: the I2S interface pins should not be driven by any external device. SARA-R4/N4 series modules support VoLTE (Voice over LTE Cat M1 radio bearer) for providing audio services. SARA-R4/N4 series modules include an I2S digital audio interface to transfer digital audio data to/from an external compatible audio device. The digital audio interface can be made available as alternative function, in mutually exclusive way, over the SPI interface pins (I2S_WA / SPI_MOSI, I2S_RXD / SPI_MISO, I2S_CLK / SPI_CLK, I2S_TXD / SPI_CS). UBX-16029218 - R11 System description Page 32 of 116 SARA-R4/N4 series - System Integration Manual 1.11 General Purpose Input/Output SARA-R4/N4 series modules include six pins (GPIO1-GPIO6) which can be configured as General Purpose Input/Output or to provide custom functions via u-blox AT commands (for more details see the SARA-R4/N4 series AT Commands Manual [2], +UGPIOC, +UGPIOR, +UGPIOW AT commands), as summarized in Table 8. Function Description Default GPIO Configurable GPIOs Network status indication Network status: registered / data transmission, no service -- GPIO1 GNSS supply enable 9 Enable/disable the supply of a u-blox GNSS receiver connected to the cellular module by the DDC (I2C) interface -- GPIO2 GNSS data ready 9 Sense when a u-blox GNSS receiver connected to the module is ready for sending data by the DDC (I2C) interface -- GPIO3 SIM card detection SIM card physical presence detection -- GPIO5 Module status indication Module switched off or in PSM low power deep sleep mode, versus active or connected mode -- GPIO1, GPIO2, GPIO3, GPIO4, GPIO5, GPIO6 Last gasp 10 Input to trigger last gasp notification -- GPIO3, GPIO4, GPIO6 General purpose input Input to sense high or low digital level -- GPIO1, GPIO2, GPIO3, GPIO4, GPIO5, GPIO6 General purpose output Output to set the high or the low digital level -- GPIO1, GPIO2, GPIO3, GPIO4, GPIO6 Pin disabled GPIO1, GPIO2, GPIO3, GPIO1, GPIO2, GPIO3, GPIO4, GPIO5, GPIO6 GPIO4, GPIO5, GPIO6 Tri-state with an internal active pull-down enabled Table 8: SARA-R4/N4 series modules GPIO custom functions configuration 1.12 Reserved pins (RSVD) SARA-R4/N4 series modules have pins reserved for future use, marked as RSVD. All the RSVD pins are to be left unconnected on the application board, except for the RSVD pin number 33 that can be externally connected to ground. 9 Not supported by “00” and “01” product versions Not supported by “00”, “01” and SARA-R410M-02B product versions 10 UBX-16029218 - R11 System description Page 33 of 116 SARA-R4/N4 series - System Integration Manual 1.13 System features 1.13.1 Network indication GPIOs can be configured by the AT command to indicate network status (for further details see section 1.11 and the SARA-R4/N4 series AT Commands Manual [2]): No service (no network coverage or not registered) Registered / Data call enabled (RF data transmission / reception) 1.13.2 Antenna supervisor The antenna detection function provided by the ANT_DET pin is based on an ADC measurement as optional feature that can be implemented if the application requires it. The antenna supervisor is forced by the +UANTR AT command (see the SARA-R4/N4 series AT Commands Manual [2] for more details). The requirements to achieve antenna detection functionality are the following: an RF antenna assembly with a built-in resistor (diagnostic circuit) must be used an antenna detection circuit must be implemented on the application board See section 1.7.2 for detailed antenna detection interface functional description and see section 2.4.2 for detection circuit on application board and diagnostic circuit on antenna assembly design-in guidelines. 1.13.3 Dual stack IPv4/IPv6 SARA-R4/N4 series support both Internet Protocol version 4 and Internet Protocol version 6 in parallel. For more details about dual stack IPv4/IPv6 see the SARA-R4/N4 series AT Commands Manual [2]. 1.13.4 TCP/IP and UDP/IP SARA-R4/N4 series modules provide embedded TCP/IP and UDP/IP protocol stack: a PDP context can be configured established and handled via the data connection management packet switched data commands. SARA-R4/N4 series modules provide Direct Link mode to establish a transparent end-to-end communication with an already connected TCP or UDP socket via serial interfaces (USB, UART). In Direct Link mode, data sent to the serial interface from an external application processor is forwarded to the network and vice-versa. For more details on embedded TCP/IP and UDP/IP functionalities, see SARA-R4/N4 series AT Commands Manual [2]. 1.13.5 FTP SARA-R4/N4 series provide embedded File Transfer Protocol (FTP) services. Files are read and stored in the local file system of the module. FTP files can also be transferred using FTP Direct Link: FTP download: data coming from the FTP server is forwarded to the host processor via USB / UART serial interfaces (for FTP without Direct Link mode the data is always stored in the module’s flash file system) FTP upload: data coming from the host processor via USB / UART serial interface is forwarded to the FTP server (for FTP without Direct Link mode the data is read from the module’s flash file system) UBX-16029218 - R11 System description Page 34 of 116 SARA-R4/N4 series - System Integration Manual When Direct Link is used for an FTP file transfer, only the file contents passes through USB / UART serial interface, whereas all the FTP command handling is managed internally by the FTP application. For more details about embedded FTP functionalities, see the SARA-R4/N4 series AT Commands Manual [2]. 1.13.6 HTTP SARA-R4/N4 series modules provide the embedded Hypertext Transfer Protocol (HTTP) services via AT commands for sending requests to a remote HTTP server, receiving the server response and transparently storing it in the module’s flash file system. For more details, see the SARA-R4/N4 series AT Commands Manual [2]. 1.13.7 Firmware update Over AT (FOAT) This feature allows upgrading of the module firmware over the AT interface, using AT commands. The +UFWUPD AT command enables a code download to the device from the host via the Xmodem protocol. The +UFWINSTALL AT command then triggers a reboot, and upon reboot initiates a firmware installation on the device via a special boot loader on the module. The bootloader first authenticates the downloaded image, then installs it, and then reboots the module. Firmware authenticity verification is performed via a security signature. The firmware is then installed, overwriting the current version. In case of power loss during this phase, the boot loader detects a fault at the next wake-up, and restarts the firmware installation. After completing the upgrade, the module is reset again and wakes-up in normal boot. For more details about Firmware update Over AT procedure, see the SARA-R4/N4 series AT Commands Manual [2], +UFWUPD AT command. 1.13.8 Firmware update Over The Air (uFOTA) This feature allows upgrading the module firmware over the air interface, based on u-blox client/server solution (uFOTA), using LWM2M. For more details about firmware update over-the-air procedure, see the SARA-R4/N4 series AT Commands Manual [2]. 1.13.9 Power saving 1.13.9.1 Guidelines to optimize power consumption The LTE Cat M1 / NB1 technology is mainly intended for applications that only require a small amount of data exchange per day (i.e. a few bytes in uplink and downlink per day). Depending on the application type, the battery may be required to last for a few years. For these reasons, the whole application board should be optimized in terms of current consumption and should carefully take into account the following aspects: Enable the low power mode configuration using the AT+UPSV command (for the complete description of the AT+UPSV command, see the SARA-R4/N4 series AT Commands Manual [2]). Enable the power saving mode configuration using the AT+CPSMS command (for the complete description of the AT+CPSMS command, see the SARA-R4/N4 series AT Commands Manual [2]). Use the UART interface instead of the USB interface as a serial communication interface, because the current consumption of the module is ~20 mA higher when the USB interface is enabled. Use an application processor with a UART interface working at the same voltage level (1.8 V) as the module. In this way it is possible to avoid voltage translators, which helps to minimize current leakage. UBX-16029218 - R11 System description Page 35 of 116 SARA-R4/N4 series - System Integration Manual If the USB interface is implemented in the design, remove the external USB VBUS voltage from the VUSB_DET input when serial communication is not necessary, letting the module enter the Power Saving Mode defined in 3GPP Rel.13: the module does not enter the deep sleep power saving mode if the USB interface is enabled. Minimize current leakage on the power supply line. Optimize the antenna matching, since a mismatched antenna leads to higher current consumption. Monitor V_INT level to sense when the module enters power-off mode or deep sleep power saving mode. Disconnect the VCC supply source from the module when it is switched off (see 2.2.1.9). Disconnect the VCC supply source from the module during deep sleep power saving mode (see 2.2.1.9): using a host application processor equipped with a RTC, the module can execute a standard PSM procedure and store the NAS protocol context in non-volatile memory, and then rely on the host application processor for running its RTC and triggering wake-up upon need11. 1.13.9.2 Functionality When power saving is enabled using the AT+CPSMS command, the module automatically enters the low power deep sleep mode whenever possible, reducing current consumption (see the section 1.5.1.4 and the SARA-R4/N4 series Data Sheet [1]). For the definition and the description of the SARA-R4/N4 series operating modes, including the events forcing transitions between the different operating modes, see section 1.4. The SARA-R4/N4 series modules achieve the low power deep sleep mode by powering down all the Hardware components with the exception of the 32 kHz reference internally generated. ☞ From the host application point of view, the serial port will not be available during low power deep sleep mode, as the SARA-R4/N4 series module will act as if it is in Power-Off mode. 1.13.9.3 Timers and network interaction The SARA-R4/N4 series modules goes in low power deep sleep mode entering in the Power Saving Mode (PSM) defined in 3GPP Release 13. Two timers have been specified on the PSM Signaling: the “Periodic Update Timer” and “Active Timer”. The “Active Timer” is the time defined by the network where the SARA-R4/N4 series module will keep listening for any active operation, during this time the module is in Active mode. The “Periodic Update Timer” is the Extended Tracking Area Update (TAU) used by the SARA-R4/N4 series module to periodically notify the network of its availability. The SARA-R4/N4 series module requests the PSM by including the “Active Timer” with the desired value in the Attach, TAU or Routing Area Update (RAU) messages. The “Active Timer” is the time the module listens to the Paging Channel after having transitioned from connected to active mode. When the “Active Timer” expires, the module enters PSM low power deep sleep mode. SARA-R4/N4 series module can also request an extended “Periodic Update Timer” value to remain in PSM low power deep sleep mode for longer than the original “Periodic Update Timer” broadcasted by the network. The grant of PSM is a negotiation between SARA-R4/N4 series module and the attached network: the network accepts PSM by providing the actual value of the “Active Timer” (and “Periodic Update Timer”) to be used in the Attach/TAU/RAU accept procedure. The maximum duration, including the 11 The use of an external RTC during deep sleep power saving mode is not supported by the “00”, “01” and “x2” product versions UBX-16029218 - R11 System description Page 36 of 116 SARA-R4/N4 series - System Integration Manual “Periodic Update Timer”, is about 413 days. The SARA-R4/N4 series module enters PSM low power deep sleep mode only after the “Active Timer” expires. Current Connected mode: Data Tx / Rx PSM low power deep sleep mode Active mode (periodic update timer) (active timer) Time Figure 14: Description of the PSM timing 1.13.9.4 Timers and AT interaction The SARA-R4/N4 series modules go into low power deep sleep mode and enter the Power Saving Mode (PSM) only after the 6 s “AT Inactivity Timer” expires: If the UART interface is used, when the host application stops sending AT commands for 6 s – the “AT Inactivity Timer” expiration – then the module enters deep sleep power saving mode according to “Active Timer” expiration. If the USB interface is enabled, the module does not enter the deep sleep power saving mode. 1.13.9.5 AT commands The module uses the +CPSMS AT command with its defined parameters to request PSM timers to the network. ☞ See the SARA-R4/N4 series AT Commands Manual [2] for details of the +CPSMS operation and features. 1.13.9.6 Host application The PSM low power deep sleep mode implementation allows the SARA-R4/N4 series module to help extend the battery life of the application. The Host Application should be aware that the SARA-R4/N4 series module is PSM-capable. ☞ The host application needs to sense the V_INT supply output of the module to get the notification when the module has entered into PSM low power deep sleep mode. ☞ If the host application receives an event that needs to be reported by the SARA-R4/N4 series module interrupting the PSM low power deep sleep mode, it can be done so by setting the module into Active mode using the appropriate power-on event (see 1.6.1). ☞ From the host application point of view, the module will look as it is in Power-Off mode. 1.13.9.7 Normal operation The Host Application can force the SARA-R4/N4 series module to transition from PSM low power deep sleep mode to Active mode by using the Power-Up procedure specified in section 1.6.1. ☞ Be aware that when the host application transitions from low power deep sleep mode to active mode, it will cause the SARA-R4/N4 series module to consume the same amount of power as in active mode, thereby shortening the battery life of the host application. UBX-16029218 - R11 System description Page 37 of 116 SARA-R4/N4 series - System Integration Manual 2 Design-in 2.1 Overview For an optimal integration of the SARA-R4/N4 series modules in the final application board, follow the design guidelines stated in this section. Every application circuit must be suitably designed to guarantee the correct functionality of the relative interface, but a number of points require particular attention during the design of the application device. The following list provides a rank of importance in the application design, starting from the highest relevance: 1. Module antenna connection: ANT and ANT_DET pins. Antenna circuit directly affects the RF compliance of the device integrating a SARA-R4/N4 series module with applicable certification schemes. Follow the suggestions provided in the relative section 2.4 for the schematic and layout design. 2. Module supply: VCC and GND pins. The supply circuit affects the RF compliance of the device integrating a SARA-R4/N4 series module with the applicable required certification schemes as well as the antenna circuit design. Very carefully follow the suggestions provided in the relative section 2.2.1 for the schematic and layout design. 3. USB interface: USB_D+, USB_D- and VUSB_DET pins. Accurate design is required to guarantee USB 2.0 high-speed interface functionality. Carefully follow the suggestions provided in the relative section 2.6.2 for the schematic and layout design. 4. SIM interface: VSIM, SIM_CLK, SIM_IO, SIM_RST pins. Accurate design is required to guarantee SIM card functionality reducing the risk of RF coupling. Carefully follow the suggestions provided in relative section 2.5 for schematic and layout design. 5. System functions: RESET_N and PWR_ON pins. Accurate design is required to guarantee that the voltage level is well defined during operation. Carefully follow the suggestions provided in relative section 2.3 for schematic and layout design. 6. Other digital interfaces: UART, SPI, SDIO, I2C, I2S, GPIOs and reserved pins. Accurate design is required to guarantee correct functionality and reduce the risk of digital data frequency harmonics coupling. Follow the suggestions provided in sections 2.6.1, 2.6.2, 2.6.3, 2.6.4, 2.6.5, 2.7, 2.8 and 2.9 for the schematic and layout design. 7. Other supplies: V_INT generic digital interfaces supply. Accurate design is required to guarantee correct functionality. Follow the suggestions provided in the corresponding section 2.2.2 for the schematic and layout design. ☞ It is recommended to follow the specific design guidelines provided by each manufacturer of any external part selected for the application board integrating the u-blox cellular modules. UBX-16029218 - R11 Design-in Page 38 of 116 SARA-R4/N4 series - System Integration Manual 2.2 Supply interfaces 2.2.1 Module supply (VCC) 2.2.1.1 General guidelines for VCC supply circuit selection and design All the available VCC pins have to be connected to the external supply minimizing the power loss due to series resistance. GND pins are internally connected. Application design shall connect all the available pads to solid ground on the application board, since a good (low impedance) connection to external ground can minimize power loss and improve RF and thermal performance. SARA-R4/N4 series modules must be sourced through the VCC pins with a suitable DC power supply that should meet the following prerequisites to comply with the modules’ VCC requirements summarized in Table 6. The appropriate DC power supply can be selected according to the application requirements (see Figure 15) between the different possible supply sources types, which most common ones are the following: Switching regulator Low Drop-Out (LDO) linear regulator Rechargeable Lithium-ion (Li-Ion) or Lithium-ion polymer (Li-Pol) battery Primary (disposable) battery Main Supply Available? No, portable device Battery Li-Ion 3.7 V Yes, always available Main Supply Voltage > 5V? No, less than 5 V Yes, greater than 5 V Linear LDO Regulator Switching Step-Down Regulator Figure 15: VCC supply concept selection The switching step-down regulator is the typical choice when primary supply source has a nominal voltage much higher (e.g. greater than 5 V) than the operating supply voltage of SARA-R4/N4 series. The use of switching step-down provides the best power efficiency for the overall application and minimizes current drawn from the main supply source. See section 2.2.1.2 for design-in. The use of an LDO linear regulator becomes convenient for a primary supply with a relatively low voltage (e.g. less or equal than 5 V). In this case, the typical 90% efficiency of the switching regulator diminishes the benefit of voltage step-down and no true advantage is gained in input current savings. On the opposite side, linear regulators are not recommended for high voltage step-down as they dissipate a considerable amount of energy in thermal power. See section 2.2.1.3 for design-in. If SARA-R4/N4 series modules are deployed in a mobile unit where no permanent primary supply source is available, then a battery will be required to provide VCC. A standard 3-cell Li-Ion or Li-Pol battery pack directly connected to VCC is the usual choice for battery-powered devices. During charging, batteries with Ni-MH chemistry typically reach a maximum voltage that is above the maximum rating for VCC, and should therefore be avoided. See sections 2.2.1.4, 2.2.1.5, 2.2.1.6 and 2.2.1.7 for specific design-in. Keep in mind that the use of rechargeable batteries requires the implementation of a suitable charger circuit, which is not included in the modules. The charger circuit needs to be designed to prevent overUBX-16029218 - R11 Design-in Page 39 of 116 SARA-R4/N4 series - System Integration Manual voltage on VCC pins, and it should be selected according to the application requirements. A DC/DC switching charger is the typical choice when the charging source has a high nominal voltage (e.g. ~12 V), whereas a linear charger is the typical choice when the charging source has a relatively low nominal voltage (~5 V). If both a permanent primary supply / charging source (e.g. ~12 V) and a rechargeable back-up battery (e.g. 3.7 V Li-Pol) are available at the same time as possible supply source, then a suitable charger / regulator with integrated power path management function can be selected to supply the module while simultaneously and independently charging the battery. See sections 2.2.1.6 and 2.2.1.7 for specific design-in. An appropriate primary (not rechargeable) battery can be selected taking into account the maximum current specified in the SARA-R4/N4 series Data Sheet [1] during connected mode, considering that primary cells might have weak power capability. See section 2.2.1.5 for specific design-in. The usage of more than one DC supply at the same time should be carefully evaluated: depending on the supply source characteristics, different DC supply systems can result as mutually exclusive. The selected regulator or battery must be able to support with adequate margin the highest averaged current consumption value specified in the SARA-R4/N4 series Data Sheet [1]. The following sections highlight some design aspects for each of the supplies listed above providing application circuit design-in compliant with the module VCC requirements summarized in Table 6. 2.2.1.2 Guidelines for VCC supply circuit design using a switching regulator The use of a switching regulator is suggested when the difference from the available supply rail source to the VCC value is high, since switching regulators provide good efficiency transforming a 12 V or greater voltage supply to the typical 3.8 V value of the VCC supply. The characteristics of the switching regulator connected to VCC pins should meet the following prerequisites to comply with the module VCC requirements summarized in Table 6: Power capability: the switching regulator with its output circuit must be capable of providing a voltage value to the VCC pins within the specified operating range and must be capable of delivering to VCC pins the maximum current consumption occurring during transmissions at the maximum power, as specified in the SARA-R4/N4 series Data Sheet [1]. Low output ripple: the switching regulator together with its output circuit must be capable of providing a clean (low noise) VCC voltage profile. High switching frequency: for best performance and for smaller applications it is recommended to select a switching frequency ≥ 600 kHz (since L-C output filter is typically smaller for high switching frequency). The use of a switching regulator with a variable switching frequency or with a switching frequency lower than 600 kHz must be carefully evaluated since this can produce noise in the VCC profile and therefore negatively impact modulation spectrum performance. PWM mode operation: it is preferable to select regulators with Pulse Width Modulation (PWM) mode. While in connected mode, the Pulse Frequency Modulation (PFM) mode and PFM/PWM modes transitions must be avoided to reduce noise on VCC voltage profile. Switching regulators can be used that are able to switch between low ripple PWM mode and high ripple PFM mode, provided that the mode transition occurs when the module changes status from the active mode to connected mode. It is permissible to use a regulator that switches from the PWM mode to the burst or PFM mode at an appropriate current threshold. UBX-16029218 - R11 Design-in Page 40 of 116 SARA-R4/N4 series - System Integration Manual Figure 16 and the components listed in Table 9 show an example of a high reliability power supply circuit for the SARA-R412M modules that support 2G radio access technology. This circuit is also suitable for the other SARA-R4/N4 series modules, where the module VCC input is supplied by a stepdown switching regulator capable of delivering the highest peak / pulse current specified for the 2G use-case, with low output ripple and with fixed switching frequency in PWM mode operation greater than 1 MHz. 12V SARA-R4/N4 R2 C2 BD 1 BOOST 2 5 RUN 9 VC R1 C1 4 VIN R3 C3 C4 6 C5 C6 L1 SW 3 10 RT 7 PG D1 U1 SYNC 51 VCC 52 VCC 53 VCC C8 R4 FB 8 C9 C10 C11 C7 GND 11 R5 GND Figure 16: Example of high reliability VCC supply circuit for SARA-R4/N4 series modules, using a step-down regulator Reference Description Part Number - Manufacturer C1 10 µF Capacitor Ceramic X7R 5750 15% 50 V Generic manufacturer C2 10 nF Capacitor Ceramic X7R 0402 10% 16 V Generic manufacturer C3 680 pF Capacitor Ceramic X7R 0402 10% 16 V Generic manufacturer C4 22 pF Capacitor Ceramic C0G 0402 5% 25 V Generic manufacturer C5 10 nF Capacitor Ceramic X7R 0402 10% 16 V Generic manufacturer C6 470 nF Capacitor Ceramic X7R 0603 10% 25 V Generic manufacturer C7 100 µF Capacitor Tantalum B_SIZE 20% 6.3V 15m T520B107M006ATE015 – Kemet C8 100 nF Capacitor Ceramic X7R 16 V GRM155R71C104KA01 - Murata C9 10 nF Capacitor Ceramic X7R 16 V GRM155R71C103KA01 - Murata C10 68 pF Capacitor Ceramic C0G 0402 5% 50 V GRM1555C1E680JA01 - Murata C11 15 pF Capacitor Ceramic C0G 0402 5% 50 V GRM1555C1E150JA01 - Murata D1 Schottky Diode 40 V 3 A MBRA340T3G - ON Semiconductor L1 10 µH Inductor 744066100 30% 3.6 A 744066100 - Wurth Electronics R1 470 k Resistor 0402 5% 0.1 W Generic manufacturer R2 15 k Resistor 0402 5% 0.1 W Generic manufacturer R3 22 k Resistor 0402 5% 0.1 W Generic manufacturer R4 390 k Resistor 0402 1% 0.063 W Generic manufacturer R5 100 k Resistor 0402 5% 0.1 W Generic manufacturer U1 Step-Down Regulator MSOP10 3.5 A 2.4 MHz LT3972IMSE#PBF - Linear Technology Table 9: Components for high reliability VCC supply circuit for SARA-R4/N4 series modules, using a step-down regulator ☞ See the section 2.2.1.10, and in particular Figure 27 / Table 19, for the parts recommended to be provided if the application device integrates an internal antenna. UBX-16029218 - R11 Design-in Page 41 of 116 SARA-R4/N4 series - System Integration Manual Figure 17 and the components listed in Table 10 show an example of a high reliability power supply circuit for SARA-R404M, SARA-R410M and SARA-N410 modules, which do not support the 2G radio access technology. In this example, the module VCC is supplied by a step-down switching regulator capable of delivering the maximum peak / pulse current specified for the LTE use-case, with low output ripple and with fixed switching frequency in PWM mode operation greater than 1 MHz. SARA-R404M SARA-R410M SARA-N410 12V 2 9 C1 C2 3V8 VCC EN 8 PG VSW U1 BST 51 1 10 C3 D1 FB 5 PGND GND 4 11 VCC 52 VCC 53 VCC L1 R1 C6 C4 C7 C8 C9 C5 GND R2 Figure 17: Example of high reliability VCC supply circuit for SARA-R404M /-R410M /-N410, using a step-down regulator Reference Description Part Number - Manufacturer C1 10 µF Capacitor Ceramic X7R 50 V Generic manufacturer C2 10 nF Capacitor Ceramic X7R 16 V Generic manufacturer C3 22 nF Capacitor Ceramic X7R 16 V Generic manufacturer C4 22 µF Capacitor Ceramic X5R 25 V Generic manufacturer C5 22 µF Capacitor Ceramic X5R 25 V Generic manufacturer C6 100 nF Capacitor Ceramic X7R 16 V GRM155R71C104KA01 - Murata C7 10 nF Capacitor Ceramic X7R 16 V GRM155R71C103KA01 - Murata C8 68 pF Capacitor Ceramic C0G 0402 5% 50 V GRM1555C1E680JA01 - Murata C9 15 pF Capacitor Ceramic C0G 0402 5% 50 V GRM1555C1E150JA01 - Murata D1 Schottky Diode 30 V 2 A MBR230LSFT1G - ON Semiconductor L1 4.7 µH Inductor 20% 2 A SLF7045T-4R7M2R0-PF - TDK R1 470 k Resistor 0.1 W Generic manufacturer R2 150 k Resistor 0.1 W Generic manufacturer U1 Step-Down Regulator 1 A 1 MHz TS30041 - Semtech Table 10: High reliability VCC supply circuit components for SARA-R404M /-R410M /-N410, using a step-down regulator ☞ See the section 2.2.1.10, and in particular Figure 27 / Table 19, for the parts recommended to be provided if the application device integrates an internal antenna. UBX-16029218 - R11 Design-in Page 42 of 116 SARA-R4/N4 series - System Integration Manual Figure 18 and the components listed in Table 11 show an example of a low cost power supply circuit suitable for all the SARA-R4/N4 series modules, where the module VCC is supplied by a step-down switching regulator capable of delivering the highest peak / pulse current specified for the 2G use-case, transforming a 12 V supply input. 12V SARA-R4/N4 8 VCC 3 INH OUT 1 L1 D1 C1 U1 6 FSW C2 2 SYNC R5 FB 5 COMP 4 51 VCC 52 VCC 53 VCC R1 R3 C7 C3 R4 GND 7 C8 C9 C10 C4 C6 C5 R2 GND Figure 18: Example of low cost VCC supply circuit for SARA-R4/N4 series modules, using a step-down regulator Reference Description Part Number - Manufacturer C1 22 µF Capacitor Ceramic X5R 1210 10% 25 V Generic manufacturer C2 220 nF Capacitor Ceramic X7R 0603 10% 25 V Generic manufacturer C3 5.6 nF Capacitor Ceramic X7R 0402 10% 50 V Generic manufacturer C4 6.8 nF Capacitor Ceramic X7R 0402 10% 50 V Generic manufacturer C5 56 pF Capacitor Ceramic C0G 0402 5% 50 V Generic manufacturer C6 100 µF Capacitor Tantalum B_SIZE 20% 6.3V 15m T520B107M006ATE015 – Kemet C7 100 nF Capacitor Ceramic X7R 16 V GRM155R71C104KA01 - Murata C8 10 nF Capacitor Ceramic X7R 16 V GRM155R71C103KA01 - Murata C9 68 pF Capacitor Ceramic C0G 0402 5% 50 V GRM1555C1E680JA01 - Murata C10 15 pF Capacitor Ceramic C0G 0402 5% 50 V GRM1555C1E150JA01 - Murata D1 Schottky Diode 25V 2 A STPS2L25 – STMicroelectronics L1 5.2 µH Inductor 30% 5.28A 22 m MSS1038-522NL – Coilcraft R1 4.7 k Resistor 0402 1% 0.063 W Generic manufacturer R2 910 Resistor 0402 1% 0.063 W Generic manufacturer R3 82 Resistor 0402 5% 0.063 W Generic manufacturer R4 8.2 k Resistor 0402 5% 0.063 W Generic manufacturer R5 39 k Resistor 0402 5% 0.063 W Generic manufacturer U1 Step-Down Regulator 8-VFQFPN 3 A 1 MHz L5987TR – ST Microelectronics Table 11: Suggested components for low cost VCC circuit for SARA-R4/N4 series modules, using a step-down regulator ☞ See the section 2.2.1.10, and in particular Figure 27 / Table 19, for the parts recommended to be provided if the application device integrates an internal antenna. UBX-16029218 - R11 Design-in Page 43 of 116 SARA-R4/N4 series - System Integration Manual 2.2.1.3 Guidelines for VCC supply circuit design using low drop-out linear regulator The use of a linear regulator is suggested when the difference from the available supply rail source and the VCC value is low. The linear regulators provide high efficiency when transforming a 5 VDC supply to a voltage value within the module VCC normal operating range. The characteristics of the Low Drop-Out (LDO) linear regulator connected to VCC pins should meet the following prerequisites to comply with the module VCC requirements summarized in Table 6: Power capabilities: the LDO linear regulator with its output circuit must be capable of providing a voltage value to the VCC pins within the specified operating range and must be capable of delivering to VCC pins the maximum current consumption occurring during a transmission at the maximum Tx power, as specified in the SARA-R4/N4 series Data Sheet [1]. Power dissipation: the power handling capability of the LDO linear regulator must be checked to limit its junction temperature to the rated range (i.e. check the voltage drop from the maximum input voltage to the minimum output voltage to evaluate the power dissipation of the regulator). Figure 19 and the components listed in Table 12 show an example of a high reliability power supply circuit for the SARA-R412M modules supporting the 2G radio access technology. This example is also suitable for the other SARA-R4/N4 series modules, where the VCC module supply is provided by an LDO linear regulator capable of delivering the highest peak / pulse current specified for the 2G usecase, with an appropriate power handling capability. The regulator described in this example supports a wide input voltage range, and it includes internal circuitry for reverse battery protection, current limiting, thermal limiting and reverse current protection. It is recommended to configure the LDO linear regulator to generate a voltage supply value slightly below the maximum limit of the module VCC normal operating range (e.g. ~4.1 V as in the circuit described in Figure 20 and Table 13). This reduces the power on the linear regulator and improves the whole thermal design of the supply circuit. SARA-R4/N4 5V 2 IN OUT 51 VCC 52 VCC 53 VCC 4 U1 R1 1 C1 SHDN ADJ C3 5 GND 3 C4 C5 C6 C2 GND R2 Figure 19: Example of high reliability VCC supply circuit for SARA-R4/N4 series modules, using an LDO linear regulator Reference Description Part Number - Manufacturer C1 10 µF Capacitor Ceramic X5R 0603 20% 6.3 V Generic manufacturer C2 100 µF Capacitor Tantalum B_SIZE 20% 6.3V 15m T520B107M006ATE015 – Kemet C3 100 nF Capacitor Ceramic X7R 16 V GRM155R71C104KA01 - Murata C4 10 nF Capacitor Ceramic X7R 16 V GRM155R71C103KA01 - Murata C5 68 pF Capacitor Ceramic C0G 0402 5% 50 V GRM1555C1E680JA01 - Murata C6 15 pF Capacitor Ceramic C0G 0402 5% 50 V GRM1555C1E150JA01 - Murata R1 9.1 k Resistor 0402 5% 0.1 W Generic manufacturer R2 3.9 k Resistor 0402 5% 0.1 W Generic manufacturer U1 LDO Linear Regulator ADJ 3.0 A LT1764AEQ#PBF - Linear Technology Table 12: Suggested components for high reliability VCC circuit for SARA-R4/N4 series modules, using an LDO regulator UBX-16029218 - R11 Design-in Page 44 of 116 SARA-R4/N4 series - System Integration Manual ☞ See the section 2.2.1.10, and in particular Figure 27 / Table 19, for the parts recommended to be provided if the application device integrates an internal antenna. Figure 20 and the components listed in Table 13 show an example of a high reliability power supply circuit for SARA-R404M, SARA-R410M and SARA-N410 modules, which do not support the 2G radio access technology, where the module VCC is supplied by an LDO linear regulator capable of delivering maximum peak / pulse current specified for LTE use-case, with suitable power handling capability. It is recommended to configure the LDO linear regulator to generate a voltage supply value slightly below the maximum limit of the module VCC normal operating range (e.g. ~4.1 V for the VCC, as in the circuits described in Figure 20 and Table 13). This reduces the power on the linear regulator and improves the thermal design of the circuit. SARA-R404M SARA-R410M SARA-N410 5V 8 IN OUT 51 1 U1 R1 C1 5 EN ADJ 3 GND 4 VCC 52 VCC 53 VCC R2 C3 C4 C5 C6 C2 GND R3 Figure 20: Example of high reliability VCC supply circuit for SARA-R404M /-R410M /-N410, using an LDO linear regulator Reference Description Part Number - Manufacturer C1 1 µF Capacitor Ceramic X5R 6.3 V Generic manufacturer C2 22 µF Capacitor Ceramic X5R 25 V Generic manufacturer C3 100 nF Capacitor Ceramic X7R 16 V GRM155R71C104KA01 - Murata C4 10 nF Capacitor Ceramic X7R 16 V GRM155R71C103KA01 - Murata C5 68 pF Capacitor Ceramic C0G 0402 5% 50 V GRM1555C1E680JA01 - Murata C6 15 pF Capacitor Ceramic C0G 0402 5% 50 V GRM1555C1E150JA01 - Murata R1 47 k Resistor 0.1 W Generic manufacturer R2 41 k Resistor 0.1 W Generic manufacturer R3 10 k Resistor 0.1 W Generic manufacturer U1 LDO Linear Regulator 1.0 A AP7361 – Diodes Incorporated Table 13: Components for high reliability VCC supply circuit for SARA-R404M /-R410M /-N410, using an LDO linear regulator ☞ See the section 2.2.1.10, and in particular Figure 27 / Table 19, for the parts recommended to be provided if the application device integrates an internal antenna. UBX-16029218 - R11 Design-in Page 45 of 116 SARA-R4/N4 series - System Integration Manual Figure 21 and the components listed in Table 14 show an example of a low cost power supply circuit, where the VCC module supply is provided by an LDO linear regulator capable of delivering the specified highest peak / pulse current, with an appropriate power handling capability. The regulator described in this example supports a limited input voltage range and it includes internal circuitry for current and thermal protection. It is recommended to configure the LDO linear regulator to generate a voltage supply value slightly below the maximum limit of the module VCC normal operating range (e.g. ~4.1 V as in the circuit described in Figure 21 and Table 14). This reduces the power on the linear regulator and improves the whole thermal design of the supply circuit. SARA-R4/N4 5V 2 IN OUT 51 VCC 52 VCC 53 VCC 4 U1 R1 1 C1 EN ADJ C3 5 GND 3 C4 C5 C6 C2 GND R2 Figure 21: Example of low cost VCC supply circuit for SARA-R4/N4 series modules, using an LDO linear regulator Reference Description Part Number - Manufacturer C1 10 µF Capacitor Ceramic X5R 0603 20% 6.3 V Generic manufacturer C2 100 µF Capacitor Tantalum B_SIZE 20% 6.3V 15m T520B107M006ATE015 – Kemet C3 100 nF Capacitor Ceramic X7R 16 V GRM155R71C104KA01 - Murata C4 10 nF Capacitor Ceramic X7R 16 V GRM155R71C103KA01 - Murata C5 68 pF Capacitor Ceramic C0G 0402 5% 50 V GRM1555C1E680JA01 - Murata C6 15 pF Capacitor Ceramic C0G 0402 5% 50 V GRM1555C1E150JA01 - Murata R1 27 k Resistor 0402 5% 0.1 W Generic manufacturer R2 4.7 k Resistor 0402 5% 0.1 W Generic manufacturer U1 LDO Linear Regulator ADJ 3.0 A LP38501ATJ-ADJ/NOPB - Texas Instrument Table 14: Suggested components for low cost VCC supply circuit for SARA-R4/N4 modules, using an LDO linear regulator ☞ See the section 2.2.1.10, and in particular Figure 27 / Table 19, for the parts recommended to be provided if the application device integrates an internal antenna. UBX-16029218 - R11 Design-in Page 46 of 116 SARA-R4/N4 series - System Integration Manual 2.2.1.4 Guidelines for VCC supply circuit design using a rechargeable battery Rechargeable Li-Ion or Li-Pol batteries connected to the VCC pins should meet the following prerequisites to comply with the module VCC requirements summarized in Table 6: Maximum pulse and DC discharge current: the rechargeable Li-Ion battery with its related output circuit connected to the VCC pins must be capable of delivering the maximum current occurring during a transmission at maximum Tx power, as specified in the SARA-R4/N4 series Data Sheet [1]. The maximum discharge current is not always reported in the data sheets of batteries, but the maximum DC discharge current is typically almost equal to the battery capacity in Amphours divided by 1 hour. DC series resistance: the rechargeable Li-Ion battery with its output circuit must be capable of avoiding a VCC voltage drop below the operating range summarized in Table 6 during transmit bursts. 2.2.1.5 Guidelines for VCC supply circuit design using a primary battery The characteristics of a primary (non-rechargeable) battery connected to VCC pins should meet the following prerequisites to comply with the module VCC requirements summarized in Table 6: Maximum pulse and DC discharge current: the non-rechargeable battery with its related output circuit connected to the VCC pins must be capable of delivering the maximum current consumption occurring during a transmission at maximum Tx power, as specified in SARA-R4/N4 series Data Sheet [1]. The maximum discharge current is not always reported in the data sheets of batteries, but the maximum DC discharge current is typically almost equal to the battery capacity in Amp-hours divided by 1 hour. DC series resistance: the non-rechargeable battery with its output circuit must be capable of avoiding a VCC voltage drop below the operating range summarized in Table 6 during transmit bursts. 2.2.1.6 Guidelines for external battery charging circuit SARA-R4/N4 series modules do not have an on-board charging circuit. Figure 22 provides an example of a battery charger design, suitable for applications that are battery powered with a Li-Ion (or LiPolymer) cell. In the application circuit, a rechargeable Li-Ion (or Li-Polymer) battery cell, that features the correct pulse and DC discharge current capabilities and the appropriate DC series resistance, is directly connected to the VCC supply input of the module. Battery charging is completely managed by the Battery Charger IC, which from a USB power source (5.0 V typ.), linearly charges the battery in three phases: Pre-charge constant current (active when the battery is deeply discharged): the battery is charged with a low current. Fast-charge constant current: the battery is charged with the maximum current, configured by the value of an external resistor. Constant voltage: when the battery voltage reaches the regulated output voltage, the Battery Charger IC starts to reduce the current until the charge termination is done. The charging process ends when the charging current reaches the value configured by an external resistor or when the charging timer reaches the factory set value. Using a battery pack with an internal NTC resistor, the Battery Charger IC can monitor the battery temperature to protect the battery from operating under unsafe thermal conditions. UBX-16029218 - R11 Design-in Page 47 of 116 SARA-R4/N4 series - System Integration Manual The Battery Charger IC, as linear charger, is more suitable for applications where the charging source has a relatively low nominal voltage (~5 V), so that a switching charger is suggested for applications where the charging source has a relatively high nominal voltage (e.g. ~12 V, see section 2.2.1.7 for the specific design-in). Li-Ion/Li-Polymer Battery Charger IC 5V0 USB Supply VDD SARA-R4/N4 Vbat C2 PG 51 VCC 52 VCC Li-Ion/Li-Pol Battery Pack 53 VCC THERM C1 θ STAT2 PROG C3 C4 C5 C6 R1 STA1 Vss B1 D1 GND D2 U1 Figure 22: Li-Ion (or Li-Polymer) battery charging application circuit Reference Description Part Number - Manufacturer B1 Li-Ion (or Li-Polymer) battery pack with 470 NTC Generic manufacturer C1 1 µF Capacitor Ceramic X7R 16 V Generic manufacturer C2 100 µF Capacitor Tantalum B_SIZE 20% 6.3V 15m T520B107M006ATE015 – Kemet C3 15 pF Capacitor Ceramic C0G 0402 5% 50 V GRM1555C1H150JA01 - Murata C4 68 pF Capacitor Ceramic C0G 0402 5% 50 V GRM1555C1H680JA01 - Murata C5 10 nF Capacitor Ceramic X7R 0402 10% 16 V GRM155R71C103KA01 - Murata C6 100 nF Capacitor Ceramic X7R 0402 10% 16 V GRM155R71C104KA01 - Murata D1, D2 Low Capacitance ESD Protection CG0402MLE-18G - Bourns R1 10 k Resistor 0.1 W Generic manufacturer U1 Single Cell Li-Ion (or Li-Polymer) Battery Charger IC MCP73833 - Microchip Table 15: Suggested components for the Li-Ion (or Li-Polymer) battery charging application circuit ☞ See the section 2.2.1.10, and in particular Figure 27 / Table 19, for the parts recommended to be provided if the application device integrates an internal antenna. 2.2.1.7 Guidelines for external charging and power path management circuit Application devices where both a permanent primary supply / charging source (e.g. ~12 V) and a rechargeable back-up battery (e.g. 3.7 V Li-Pol) are available at the same time as a possible supply source, should implement a suitable charger / regulator with integrated power path management function to supply the module and the whole device while simultaneously and independently charging the battery. Figure 23 reports a simplified block diagram circuit showing the working principle of a charger / regulator with integrated power path management function. This component allows the system to be powered by a permanent primary supply source (e.g. ~12 V) using the integrated regulator, which simultaneously and independently recharges the battery (e.g. 3.7 V Li-Pol) that represents the backup supply source of the system. The power path management feature permits the battery to supplement the system current requirements when the primary supply source is not available or cannot deliver the peak system currents. UBX-16029218 - R11 Design-in Page 48 of 116 SARA-R4/N4 series - System Integration Manual A power management IC should meet the following prerequisites to comply with the module VCC requirements summarized in Table 6: High efficiency internal step down converter, with characteristics as indicated in section 2.2.1.2 Low internal resistance in the active path Vout – Vbat, typically lower than 50 m High efficiency switch mode charger with separate power path control Power path management IC 12 V Primary Source Vin System Vout DC/DC converter and battery FET control logic Vbat Li-Ion/Li-Pol Battery Pack Charge controller GND GND θ Figure 23: Charger / regulator with integrated power path management circuit block diagram Figure 24 and the parts listed in Table 16 provide an application circuit example where the MPS MP2617H switching charger / regulator with integrated power path management function provides the supply to the cellular module. At the same time it also concurrently and autonomously charges a suitable Li-Ion (or Li-Polymer) battery with the correct pulse and DC discharge current capabilities and the appropriate DC series resistance according to the rechargeable battery recommendations described in section 2.2.1.4. The MP2617H IC constantly monitors the battery voltage and selects whether to use the external main primary supply / charging source or the battery as supply source for the module, and starts a charging phase accordingly. The MP2617H IC normally provides a supply voltage to the module regulated from the external main primary source allowing immediate system operation even under missing or deeply discharged battery: the integrated switching step-down regulator is capable to provide up to 3 A output current with low output ripple and fixed 1.6 MHz switching frequency in PWM mode operation. The module load is satisfied in priority, then the integrated switching charger will take the remaining current to charge the battery. Additionally, the power path control allows an internal connection from battery to the module with a low series internal ON resistance (40 m typical), in order to supplement additional power to the module when the current demand increases over the external main primary source or when this external source is removed. Battery charging is managed in three phases: Pre-charge constant current (active when the battery is deeply discharged): the battery is charged with a low current, set to 10% of the fast-charge current Fast-charge constant current: the battery is charged with the maximum current, configured by the value of an external resistor to a value suitable for the application Constant voltage: when the battery voltage reaches the regulated output voltage (4.2 V), the current is progressively reduced until the charge termination is done. The charging process ends when the charging current reaches the 10% of the fast-charge current or when the charging timer reaches the value configured by an external capacitor UBX-16029218 - R11 Design-in Page 49 of 116 SARA-R4/N4 series - System Integration Manual Using a battery pack with an internal NTC resistor, the MP2617H can monitor the battery temperature to protect the battery from operating under unsafe thermal conditions. Several parameters as the charging current, the charging timings, the input current limit, the input voltage limit, the system output voltage can be easily set according to the specific application requirements, as the actual electrical characteristics of the battery and the external supply / charging source: suitable resistors or capacitors must be accordingly connected to the related pins of the IC. Li-Ion/Li-Polymer Battery Charger / Regulator with Power Path Managment BST 12V Primary Source VIN C4 D3 R4 VLIM SYS R7 R1 R2 ENn BAT ILIM NTC ISET VCC TMR C2 AGND PGND 51 VCC 52 VCC 53 VCC + SYSFB R5 C1 SARA-R4/N4 L1 SW R6 C5 Li-Ion/Li-Pol Battery Pack C10 C11 C12 C13 θ R3 C3 C6 C7 C8 D1 D2 GND B1 U1 Figure 24: Li-Ion (or Li-Polymer) battery charging and power path management application circuit Reference Description Part Number - Manufacturer B1 Li-Ion (or Li-Polymer) battery pack with 10 k NTC Various manufacturer C1, C6 22 µF Capacitor Ceramic X5R 1210 10% 25 V GRM32ER61E226KE15 - Murata C2, C4, C10 100 nF Capacitor Ceramic X7R 0402 10% 16 V GRM155R61A104KA01 - Murata C3 1 µF Capacitor Ceramic X7R 0603 10% 25 V GRM188R71E105KA12 - Murata C5 330 µF Capacitor Tantalum D_SIZE 6.3 V 45 m T520D337M006ATE045 - KEMET C7, C12 68 pF Capacitor Ceramic C0G 0402 5% 50 V GRM1555C1H680JA01 - Murata C8, C13 15 pF Capacitor Ceramic C0G 0402 5% 25 V GRM1555C1E150JA01 - Murata C11 10 nF Capacitor Ceramic X7R 0402 10% 16 V GRM155R71C103KA01 - Murata D1, D2 Low Capacitance ESD Protection CG0402MLE-18G - Bourns D3 Schottky Diode 40 V 3 A MBRA340T3G - ON Semiconductor R1, R3, R5, R7 10 k Resistor 0402 1% 1/16 W Generic manufacturer R2 1.05 k Resistor 0402 1% 0.1 W Generic manufacturer R4 22 k Resistor 0402 1% 1/16 W Generic manufacturer R6 26.5 k Resistor 0402 1% 1/16 W Generic manufacturer L1 2.2 µH Inductor 7.4 A 13 m 20% SRN8040-2R2Y - Bourns U1 Li-Ion/Li-Polymer Battery DC/DC Charger / Regulator with integrated Power Path Management function MP2617H - Monolithic Power Systems (MPS) Table 16: Suggested components for battery charging and power path management application circuit ☞ See the section 2.2.1.10, and in particular Figure 27 / Table 19, for the parts recommended to be provided if the application device integrates an internal antenna. UBX-16029218 - R11 Design-in Page 50 of 116 SARA-R4/N4 series - System Integration Manual 2.2.1.8 Guidelines for particular VCC supply circuit design for SARA-R412M SARA-R412M modules have separate supply inputs over the VCC pins (see Figure 3): VCC pins #52 and #53: supply input for the internal RF Power Amplifier, demanding most of the total current drawn of the module when RF transmission is enabled during a call VCC pin #51: supply input for the internal Power Management Unit, Base-Band and Transceiver parts, demanding minor current Generally, all the VCC pins are intended to be connected to the same external power supply circuit, but separate supply sources can be implemented for specific (e.g. battery-powered) applications. The voltage at the VCC pins #52 and #53 can drop to a value lower than the one at the VCC pin #51, keeping the module still switched-on and functional. Figure 25 illustrates a possible application circuit. L1 D1 SARA-R412M Step-up Regulator VIN SW SHDNn C6 51 R1 FB C8 C7 R2 GND U1 Li-Ion/Li-Pol Battery VCC 52 VCC 53 VCC + C1 C2 C3 C4 C5 GND Figure 25: VCC circuit example with separate supply for SARA-R412M modules Reference Description Part Number - Manufacturer C1 100 µF Capacitor Tantalum B_SIZE 20% 6.3V 15m T520B107M006ATE015 – Kemet C2 100 nF Capacitor Ceramic X7R 0402 10% 16 V GRM155R61A104KA01 - Murata C3 10 nF Capacitor Ceramic X7R 0402 10% 16 V GRM155R71C103KA01 - Murata C4 56 pF Capacitor Ceramic C0G 0402 5% 25 V GRM1555C1E560JA01 - Murata C5 15 pF Capacitor Ceramic C0G 0402 5% 25 V GRM1555C1E150JA01 - Murata C6 10 µF Capacitor Ceramic X5R 0603 20% 6.3 V GRM188R60J106ME47 - Murata C7 22 µF Capacitor Ceramic X5R 1210 10% 25 V GRM32ER61E226KE15 - Murata C8 10 pF Capacitor Ceramic C0G 0402 5% 25 V GRM1555C1E100JA01 - Murata D1 Schottky Diode 40 V 1 A SS14 - Vishay General Semiconductor L1 10 µH Inductor 20% 1 A 276 m SRN3015-100M - Bourns Inc. R1 1 M Resistor 0402 5% 0.063 W Generic manufacturer R2 412 k Resistor 0402 5% 0.063 W Generic manufacturer U1 Step-up Regulator 350 mA AP3015 - Diodes Incorporated Table 17: Examples of components for the VCC circuit with separate supply for SARA-R412M modules ☞ See the section 2.2.1.10, and in particular Figure 27 / Table 19, for the parts recommended to be provided if the application device integrates an internal antenna. UBX-16029218 - R11 Design-in Page 51 of 116 SARA-R4/N4 series - System Integration Manual 2.2.1.9 Guidelines for removing VCC supply Removing the VCC power can be useful to minimize the current consumption when the SARA-R4/N4 series modules are switched off or when the modules are in deep sleep Power Saving Mode. In applications in which the module is paired to a host application processor equipped with a RTC, the module can execute standard PSM procedures, store NAS protocol context in non-volatile memory, and rely on the host application processor to run its RTC and to trigger wake-up upon need. The application processor can disconnect the VCC supply source from the module and zero out the module’s PSM current. The VCC supply source can be removed using an appropriate low-leakage load switch or p-channel MOSFET controlled by the application processor as shown in Figure 26, given that the external switch has provide: Very low leakage current (for example, less than 1 µA), to minimize the current consumption Very low RDS(ON) series resistance (for example, less than 50 m), to minimize voltage drops Adequate maximum Drain current (see the SARA-R4/N4 series Data Sheet [1] for module current consumption figures) SARA-R4/N4 U1 VCC Supply Source VIN VOUT VBIAS GPIO Application Processor CT ON GND + C1 C2 C3 C4 C5 GPIO GPIO GND 51 VCC 52 VCC 53 VCC 4 V_INT 15 PWR_ON R2 T1 R1 GND Figure 26: Example of application circuit for VCC supply removal Reference Description Part Number - Manufacturer C1 100 µF Capacitor Tantalum B_SIZE 20% 6.3V 15m T520B107M006ATE015 – Kemet C2 10 nF Capacitor Ceramic X7R 0402 10% 16 V GRM155R71C103KA01 - Murata C3 100 nF Capacitor Ceramic X7R 0402 10% 16 V GRM155R61A104KA01 - Murata C4 68 pF Capacitor Ceramic C0G 0402 5% 50 V GRM1555C1H680JA01 - Murata C5 15 pF Capacitor Ceramic C0G 0402 5% 25 V GRM1555C1E150JA01 - Murata R1, R3 47 k Resistor 0402 5% 0.1 W RC0402JR-0747KL - Yageo Phycomp R2 10 k Resistor 0402 5% 0.1 W RC0402JR-0710KL - Yageo Phycomp T1 NPN BJT Transistor BC847 - Infineon U1 Ultra-Low Resistance Load Switch TPS22967 - Texas Instruments Table 18: Components for VCC supply removal application circuit ☞ It is highly recommended to avoid an abrupt removal of the VCC supply during SARA-R4/N4 series normal operations: the VCC supply can be removed only after V_INT goes low, indicating that the module has entered Deep-Sleep Power Saving Mode or Power-Off Mode. ☞ See the section 2.2.1.10, and in particular Figure 27 / Table 19, for the parts recommended to be provided if the application device integrates an internal antenna. UBX-16029218 - R11 Design-in Page 52 of 116 SARA-R4/N4 series - System Integration Manual 2.2.1.10 Additional guidelines for VCC supply circuit design To reduce voltage drops, use a low impedance power source. The series resistance of the supply lines (connected to the modules’ VCC and GND pins) on the application board and battery pack should also be considered and minimized: cabling and routing must be as short as possible to minimize losses. Three pins are allocated to VCC supply connection. Several pins are designated for GND connection. It is recommended to correctly connect all of them to supply the module minimizing series resistance. To reduce voltage ripple and noise, improving RF performance especially if the application device integrates an internal antenna, place the following bypass capacitors near the VCC pins: 68 pF capacitor with Self-Resonant Frequency in the 800/900 MHz range (e.g. Murata GRM1555C1H680J), to filter EMI in the low cellular frequency bands 15 pF capacitor with Self-Resonant Frequency in the 1800/1900 MHz range (as Murata GRM1555C1H150J), to filter EMI in the high cellular frequency bands 10 nF capacitor (e.g. Murata GRM155R71C103K), to filter digital logic noise from clocks and data 100 nF capacitor (e.g. Murata GRM155R61C104K), to filter digital logic noise from clocks and data An additional capacitor is recommended to avoid undershoot and overshoot at the start and at the end of RF transmission: 100 µF low ESR capacitor (e.g Kemet T520B107M006ATE015), for SARA-R412M supporting 2G 10 µF capacitor (or greater), for the other SARA-R4/N4 series modules that do not support 2G An additional series ferrite bead is recommended for additional RF noise filtering, in particular if the application device integrates an internal antenna: Ferrite bead specifically designed for EMI suppression in GHz band (e.g. Murata BLM18EG221SN1), placed as close as possible to the VCC pins of the module, implementing the circuit described in Figure 27, to filter out EMI in all the cellular bands SARA-R4/N4 VCC 51 VCC 52 VCC 53 C5 Capacitor with SRF ~900 MHz 3V8 FB1 + C1 C2 C3 C4 Ferrite Bead for GHz noise SARA FB1 C5 Capacitor with SRF ~1900 MHz GND plane C1 C2 C3 C4 VCC line GND Figure 27: Suggested design to reduce ripple / noise on VCC, highly recommended when using an integrated antenna Reference Description Part Number - Manufacturer C1 68 pF Capacitor Ceramic C0G 0402 5% 50 V GRM1555C1H680JA01 - Murata C2 15 pF Capacitor Ceramic C0G 0402 5% 50 V GRM1555C1H150JA01 - Murata C3 10 nF Capacitor Ceramic X7R 0402 10% 16 V GRM155R71C103KA01 - Murata C4 100 nF Capacitor Ceramic X7R 0402 10% 16 V GRM155R71C104KA01 - Murata C5 100 µF Capacitor Tantalum B_SIZE 20% 6.3V 15m T520B107M006ATE015 – Kemet 10 µF Capacitor Ceramic X5R 0603 20% 6.3 V GRM188R60J106ME47 - Murata Chip Ferrite Bead EMI Filter for GHz Band Noise 220 at 100 MHz, 260 at 1 GHz, 2000 mA BLM18EG221SN1 - Murata FB1 Table 19: Suggested components to reduce ripple / noise on VCC ☞ The necessity of each part depends on the specific design, but it is recommended to provide all the parts described in Figure 27 / Table 19 if the application device integrates an internal antenna. UBX-16029218 - R11 Design-in Page 53 of 116 SARA-R4/N4 series - System Integration Manual ☞ ESD sensitivity rating of the VCC supply pins is 1 kV (HBM according to JESD22-A114). Higher protection level can be required if the line is externally accessible on the application board, e.g. if accessible battery connector is directly connected to the supply pins. Higher protection level can be achieved by mounting an ESD protection (e.g. EPCOS CA05P4S14THSG varistor) close to accessible point. 2.2.1.11 Guidelines for VCC supply layout design Good connection of the module VCC pins with DC supply source is required for correct RF performance. Guidelines are summarized in the following list: All the available VCC pins must be connected to the DC source VCC connection must be as wide as possible and as short as possible Any series component with Equivalent Series Resistance (ESR) greater than few milliohms must be avoided VCC connection must be routed through a PCB area separated from RF lines / parts, sensitive analog signals and sensitive functional units: it is good practice to interpose at least one layer of PCB ground between the VCC track and other signal routing VCC connection must be routed as far as possible from the antenna, in particular if embedded in the application device: see Figure 28 Coupling between VCC and digital lines, especially USB, must be avoided. The tank bypass capacitor with low ESR for current spikes smoothing described in section 2.2.1.10 should be placed close to the VCC pins. If the main DC source is a switching DC-DC converter, place the large capacitor close to the DC-DC output and minimize VCC track length. Otherwise consider using separate capacitors for DC-DC converter and module tank capacitor The bypass capacitors in the pF range described in Figure 27 and Table 19 should be placed as close as possible to the VCC pins, where the VCC line narrows close to the module input pins, improving the RF noise rejection in the band centered on the Self-Resonant Frequency of the pF capacitors. This is highly recommended if the application device integrates an internal antenna Since VCC input provide the supply to RF Power Amplifiers, voltage ripple at high frequency may result in unwanted spurious modulation of transmitter RF signal. This is more likely to happen with switching DC-DC converters, in which case it is better to select the highest operating frequency for the switcher and add a large L-C filter before connecting to the SARA-R4/N4 series modules in the worst case Shielding of switching DC-DC converter circuit, or at least the use of shielded inductors for the switching DC-DC converter, may be considered since all switching power supplies may potentially generate interfering signals as a result of high-frequency high-power switching. If VCC is protected by transient voltage suppressor to ensure that the voltage maximum ratings are not exceeded, place the protecting device along the path from the DC source toward the module, preferably closer to the DC source (otherwise protection function may be compromised) Antenna Antenna ANT VCC VCC ANT Antenna SARA SARA NOT OK NOT OK SARA ANT VCC OK Figure 28: VCC line routing guideline for designs integrating an embedded antenna UBX-16029218 - R11 Design-in Page 54 of 116 SARA-R4/N4 series - System Integration Manual 2.2.1.12 Guidelines for grounding layout design Good connection of the module GND pins with application board solid ground layer is required for correct RF performance. It significantly reduces EMC issues and provides a thermal heat sink for the module. Connect each GND pin with application board solid GND layer. It is strongly recommended that each GND pad surrounding VCC pins have one or more dedicated via down to the application board solid ground layer The VCC supply current flows back to main DC source through GND as ground current: provide adequate return path with suitable uninterrupted ground plane to main DC source It is recommended to implement one layer of the application board as ground plane as wide as possible If the application board is a multilayer PCB, then all the board layers should be filled with GND plane as much as possible and each GND area should be connected together with complete via stack down to the main ground layer of the board. Use as many vias as possible to connect the ground planes Provide a dense line of vias at the edges of each ground area, in particular along RF and high speed lines If the whole application device is composed by more than one PCB, then it is required to provide a good and solid ground connection between the GND areas of all the different PCBs Good grounding of GND pads also ensures thermal heat sink. This is critical during connection, when the real network commands the module to transmit at maximum power: correct grounding helps prevent module overheating. 2.2.2 Generic digital interfaces supply output (V_INT) 2.2.2.1 Guidelines for V_INT circuit design SARA-R4/N4 series modules provide the V_INT generic digital interfaces 1.8 V supply output, which can be mainly used to: Indicate when the module is switched on and it is not in the deep sleep power saving mode (as described in sections 1.6.1, 1.6.2) Pull-up SIM detection signal (see section 2.5 for more details) Supply voltage translators to connect 1.8 V module generic digital interfaces to 3.0 V devices (e.g. see 2.6.1) Enable external voltage regulators providing supply for external devices ☞ Do not apply loads which might exceed the maximum available current from V_INT supply (see SARA-R4/N4 series Data Sheet [1]) as this can cause malfunctions in internal circuitry. ☞ ☞ V_INT can only be used as an output: do not connect any external supply source on V_INT. ☞ It is recommended to monitor the V_INT pin to sense the end of the internal switch-off sequence of SARA-R4/N4 series modules: VCC supply can be removed only after V_INT goes low. ☞ It is recommended to provide direct access to the V_INT pin on the application board by means of an accessible test point directly connected to the V_INT pin. ESD sensitivity rating of the V_INT supply pin is 1 kV (HBM according to JESD22-A114). Higher protection level could be required if the line is externally accessible and it can be achieved by mounting an ESD protection (e.g. EPCOS CA05P4S14THSG) close to accessible point. UBX-16029218 - R11 Design-in Page 55 of 116 SARA-R4/N4 series - System Integration Manual 2.3 System functions interfaces 2.3.1 Module power-on (PWR_ON) 2.3.1.1 Guidelines for PWR_ON circuit design SARA-R4/N4 series PWR_ON input is equipped with an internal active pull-up resistor; an external pull-up resistor is not required and should not be provided. If connecting the PWR_ON input to a push button, the pin will be externally accessible on the application device. According to EMC/ESD requirements of the application, an additional ESD protection should be provided close to the accessible point, as described in Figure 29 and Table 20. ☞ ESD sensitivity rating of the PWR_ON pin is 1 kV (Human Body Model according to JESD22-A114). Higher protection level can be required if the line is externally accessible on the application board, e.g. if an accessible push button is directly connected to PWR_ON pin, and it can be achieved by mounting an ESD protection (e.g. EPCOS CA05P4S14THSG varistor) close to the accessible point. An open drain or open collector output is suitable to drive the PWR_ON input from an application processor, as described in Figure 29. ☞ PWR_ON input pin should not be driven high by an external device, as it may cause start up issues. SARA-R4/N4 Power-on push button TP Application Processor Open Drain Output 15 PWR_ON SARA-R4/N4 TP 15 PWR_ON ESD Figure 29: PWR_ON application circuits using a push button and an open drain output of an application processor Reference Description Remarks ESD CT0402S14AHSG - EPCOS Varistor array for ESD protection Table 20: Example ESD protection component for the PWR_ON application circuit ☞ It is recommended to provide direct access to the PWR_ON pin on the application board by means of an accessible test point directly connected to the PWR_ON pin. 2.3.1.2 Guidelines for PWR_ON layout design The power-on circuit (PWR_ON) requires careful layout since it is the sensitive input available to switch on and switch off the SARA-R4/N4 series modules. It is required to ensure that the voltage level is well defined during operation and no transient noise is coupled on this line, otherwise the module might detect a spurious power-on request. UBX-16029218 - R11 Design-in Page 56 of 116 SARA-R4/N4 series - System Integration Manual 2.3.2 Module reset (RESET_N) 2.3.2.1 Guidelines for RESET_N circuit design SARA-R4/N4 series RESET_N is equipped with an internal pull-up; an external pull-up resistor is not required. If connecting the RESET_N input to a push button, the pin will be externally accessible on the application device. According to EMC/ESD requirements of the application, an additional ESD protection device (e.g. the EPCOS CA05P4S14THSG varistor) should be provided close to accessible point on the line connected to this pin, as described in Figure 30 and Table 21. ☞ ESD sensitivity rating of the RESET_N pin is 1 kV (HBM according to JESD22-A114). Higher protection level can be required if the line is externally accessible on the application board, e.g. if an accessible push button is directly connected to the RESET_N pin, and it can be achieved by mounting an ESD protection (e.g. EPCOS CA05P4S14THSG varistor) close to accessible point. An open drain output or open collector output is suitable to drive the RESET_N input from an application processor, as described in Figure 30. ☞ RESET_N input pin should not be driven high by an external device, as it may cause start up issues. SARA-R4/N4 Power-on push button TP 18 Application Processor Open Drain Output RESET_N SARA-R4/N4 TP 18 RESET_N ESD Figure 30: RESET_N application circuits using a push button and an open drain output of an application processor Reference Description Remarks ESD Varistor for ESD protection CT0402S14AHSG - EPCOS Table 21: Example of ESD protection component for the RESET_N application circuits ☞ If the external reset function is not required by the customer application, the RESET_N input pin can be left unconnected to external components, but it is recommended providing direct access on the application board by means of an accessible test point directly connected to the RESET_N pin. 2.3.2.2 Guidelines for RESET_N layout design The RESET_N circuit require careful layout due to the pin function: ensure that the voltage level is well defined during operation and no transient noise is coupled on this line, otherwise the module might detect a spurious reset request. It is recommended to keep the connection line to RESET_N pin as short as possible. UBX-16029218 - R11 Design-in Page 57 of 116 SARA-R4/N4 series - System Integration Manual 2.4 Antenna interface SARA-R4/N4 series modules provide an RF interface for connecting the external antenna: the ANT pin represents the RF input/output for RF signals transmission and reception. The ANT pin has a nominal characteristic impedance of 50 and must be connected to the physical antenna through a 50 transmission line to allow clean transmission / reception of RF signals. 2.4.1 Antenna RF interface (ANT) 2.4.1.1 General guidelines for antenna selection and design The antenna is the most critical component to be evaluated. Designers must take care of the antenna from all perspective at the very start of the design phase when the physical dimensions of the application board are under analysis/decision, since the RF compliance of the device integrating SARA-R4/N4 series modules with all the applicable required certification schemes depends on antenna’s radiating performance. Cellular antennas are typically available as: External antennas (e.g. linear monopole): o External antennas basically do not imply physical restriction to the design of the PCB where the SARA-R4/N4 series module is mounted. o The radiation performance mainly depends on the antennas. It is required to select antennas with optimal radiating performance in the operating bands. o RF cables should be carefully selected to have minimum insertion losses. Additional insertion loss will be introduced by low quality or long cable. Large insertion loss reduces both transmit and receive radiation performance. o A high quality 50 RF connector provides a clean PCB-to-RF-cable transition. It is recommended to strictly follow the layout and cable termination guidelines provided by the connector manufacturer. Integrated antennas (e.g. PCB antennas such as patches or ceramic SMT elements): o Internal integrated antennas imply physical restriction to the design of the PCB: Integrated antenna excites RF currents on its counterpoise, typically the PCB ground plane of the device that becomes part of the antenna: its dimension defines the minimum frequency that can be radiated. Therefore, the ground plane can be reduced down to a minimum size that should be similar to the quarter of the wavelength of the minimum frequency that needs to be radiated, given that the orientation of the ground plane relative to the antenna element must be considered. As numerical example, the physical restriction to the PCB design can be considered as following: Frequency = 750 MHz Wavelength = 40 cm Minimum GND plane size = 10 cm o Radiation performance depends on the whole PCB and antenna system design, including product mechanical design and usage. Antennas should be selected with optimal radiating performance in the operating bands according to the mechanical specifications of the PCB and the whole product. o It is recommended to select a custom antenna designed by an antennas’ manufacturer if the required ground plane dimensions are very small (e.g. less than 6.5 cm long and 4 cm wide). The antenna design process should begin at the start of the whole product design process o It is highly recommended to strictly follow the detailed and specific guidelines provided by the antenna manufacturer regarding correct installation and deployment of the antenna system, including PCB layout and matching circuitry o Further to the custom PCB and product restrictions, antennas may require tuning to obtain the required performance for compliance with all the applicable required certification schemes. It is recommended to consult the antenna manufacturer for the design-in guidelines for antenna matching relative to the custom application UBX-16029218 - R11 Design-in Page 58 of 116 SARA-R4/N4 series - System Integration Manual In both of cases, selecting external or internal antennas, these recommendations should be observed: Select an antenna providing optimal return loss (or VSWR) figure over all the operating frequencies. Select an antenna providing optimal efficiency figure over all the operating frequencies. Select an antenna providing appropriate gain figure (i.e. combined antenna directivity and efficiency figure) so that the electromagnetic field radiation intensity do not exceed the regulatory limits specified in some countries (e.g. by FCC in the United States, as reported in the section 4.2.2). 2.4.1.2 Guidelines for antenna RF interface design Guidelines for ANT pin RF connection design A clean transition between the ANT pad and the application board PCB must be provided, implementing the following design-in guidelines for the layout of the application PCB close to the ANT pad: On a multilayer board, the whole layer stack below the RF connection should be free of digital lines Increase GND keep-out (i.e. clearance, a void area) around the ANT pad, on the top layer of the application PCB, to at least 250 µm up to adjacent pads metal definition and up to 400 µm on the area below the module, to reduce parasitic capacitance to ground, as described in the left picture in Figure 31 Add GND keep-out (i.e. clearance, a void area) on the buried metal layer below the ANT pad if the top-layer to buried layer dielectric thickness is below 200 µm, to reduce parasitic capacitance to ground, as described in the right picture in Figure 31 GND clearance on top layer around ANT pad GND clearance on buried layer very close to top layer below ANT pad Min. 250 µm ANT Min. 400 µm GND Figure 31: GND keep-out area on top layer around ANT pad and on very close buried layer below ANT pad Guidelines for RF transmission line design Any RF transmission line, such as the ones from the ANT pad up to the related antenna connector or up to the related internal antenna pad, must be designed so that the characteristic impedance is as close as possible to 50 . RF transmission lines can be designed as a micro strip (consists of a conducting strip separated from a ground plane by a dielectric material) or a strip line (consists of a flat strip of metal which is sandwiched between two parallel ground planes within a dielectric material). The micro strip, implemented as a coplanar waveguide, is the most common configuration for printed circuit board. Figure 32 and Figure 33 provide two examples of suitable 50 coplanar waveguide designs. The first example of RF transmission line can be implemented in case of 4-layer PCB stack-up herein described, and the second example of RF transmission line can be implemented in case of 2-layer PCB stack-up herein described. UBX-16029218 - R11 Design-in Page 59 of 116 SARA-R4/N4 series - System Integration Manual 500 µm 380 µm 500 µm L1 Copper 35 µm FR-4 dielectric 270 µm L2 Copper 35 µm FR-4 dielectric 760 µm L3 Copper 35 µm FR-4 dielectric 270 µm L4 Copper 35 µm Figure 32: Example of 50 coplanar waveguide transmission line design for the described 4-layer board layup 400 µm 1200 µm 400 µm L1 Copper 35 µm FR-4 dielectric 1510 µm L2 Copper 35 µm Figure 33: Example of 50 coplanar waveguide transmission line design for the described 2-layer board layup If the two examples do not match the application PCB stack-up, then the 50 characteristic impedance calculation can be made using the HFSS commercial finite element method solver for electromagnetic structures from Ansys Corporation, or using freeware tools like Avago / Broadcom AppCAD (https://www.broadcom.com/appcad) taking care of the approximation formulas used by the tools for the impedance computation. To achieve a 50 characteristic impedance, the width of the transmission line must be chosen depending on: the thickness of the transmission line itself (e.g. 35 µm in the example of Figure 32 and Figure 33) the thickness of the dielectric material between the top layer (where the transmission line is routed) and the inner closer layer implementing the ground plane (e.g. 270 µm in Figure 32, 1510 µm in Figure 33) the dielectric constant of the dielectric material (e.g. dielectric constant of the FR-4 dielectric material in Figure 32 and Figure 33) the gap from the transmission line to the adjacent ground plane on the same layer of the transmission line (e.g. 500 µm in Figure 32, 400 µm in Figure 33) If the distance between the transmission line and the adjacent GND area (on the same layer) does not exceed 5 times the track width of the micro strip, use the “Coplanar Waveguide” model for the 50 calculation. Additionally to the 50 impedance, the following guidelines are recommended for transmission lines design: Minimize the transmission line length: the insertion loss should be minimized as much as possible, in the order of a few tenths of a dB, UBX-16029218 - R11 Design-in Page 60 of 116 SARA-R4/N4 series - System Integration Manual Add GND keep-out (i.e. clearance, a void area) on buried metal layers below any pad of component present on the RF transmission lines, if top-layer to buried layer dielectric thickness is below 200 µm, to reduce parasitic capacitance to ground, The transmission lines width and spacing to GND must be uniform and routed as smoothly as possible: avoid abrupt changes of width and spacing to GND, Add GND stitching vias around transmission lines, as described in Figure 34, Ensure solid metal connection of the adjacent metal layer on the PCB stack-up to main ground layer, providing enough vias on the adjacent metal layer, as described in Figure 34, Route RF transmission lines far from any noise source (as switching supplies and digital lines) and from any sensitive circuit (as USB), Avoid stubs on the transmission lines, Avoid signal routing in parallel to transmission lines or crossing the transmission lines on buried metal layer, Do not route microstrip lines below discrete component or other mechanics placed on top layer Two examples of a suitable RF circuit design are illustrated in Figure 34, where the antenna detection circuit is not implemented (if the antenna detection function is required by the application, follow the guidelines for circuit and layout implementation detailed in section 2.4.2): In the first example shown on the left, the ANT pin is directly connected to an SMA connector by means of a suitable 50 transmission line, designed with the appropriate layout. In the second example shown on the right, the ANT pin is connected to an SMA connector by means of a suitable 50 transmission line, designed with the appropriate layout, with an additional high pass filter to improve the ESD immunity at the antenna port. (The filter consists of a suitable series capacitor and shunt inductor, for example the Murata GRM1555C1H150JA01 15 pF capacitor and the Murata LQG15HN39NJ02 39 nH inductor with Self-Resonant Frequency ~1 GHz.). SARA module SARA module High-pass filter to improve ESD immunity SMA connector SMA connector Figure 34: Example of circuit and layout for antenna RF circuits on the application board Guidelines for RF termination design The RF termination must provide a characteristic impedance of 50 as well as the RF transmission line up to the RF termination, to match the characteristic impedance of the ANT port. However, real antennas do not have a perfect 50 load on all the supported frequency bands. So to reduce as much as possible any performance degradation due to antenna mismatching, the RF termination must provide optimal return loss (or VSWR) figures over all the operating frequencies, as summarized in Table 7. UBX-16029218 - R11 Design-in Page 61 of 116 SARA-R4/N4 series - System Integration Manual If an external antenna is used, the antenna connector represents the RF termination on the PCB: Use suitable a 50 connector providing a clean PCB-to-RF-cable transition. Strictly follow the connector manufacturer’s recommended layout, for example: o SMA Pin-Through-Hole connectors require a GND keep-out (i.e. clearance, a void area) on all the layers around the central pin up to the annular pads of the four GND posts, as shown in Figure 34 o U.FL surface mounted connectors require no conductive traces (i.e. clearance, a void area) in the area below the connector between the GND land pads. Cut out the GND layer under the RF connector and close to any buried vias, to remove stray capacitance and thus keep the RF line at 50 , e.g. the active pad of UFL connector needs to have a GND keep-out (i.e. clearance, a void area) at least on the first inner layer to reduce parasitic capacitance to ground. If an integrated antenna is used, the integrated antenna represents the RF terminations. The following guidelines should be followed: Use an antenna designed by an antenna manufacturer providing the best possible return loss (or VSWR). Provide a ground plane large enough according to the relative integrated antenna requirements. The ground plane of the application PCB can be reduced down to a minimum size that must be similar to one quarter of wavelength of the minimum frequency that needs to be radiated. As numerical example, Frequency = 750 MHz Wavelength = 40 cm Minimum GND plane size = 10 cm It is highly recommended to strictly follow the detailed and specific guidelines provided by the antenna manufacturer regarding correct installation and deployment of the antenna system, including the PCB layout and matching circuitry. Further to the custom PCB and product restrictions, the antenna may require a tuning to comply with all the applicable required certification schemes. It is recommended to consult the antenna manufacturer for the design-in guidelines for the antenna matching relative to the custom application. Additionally, these recommendations regarding the antenna system placement must be followed: Do not place the antenna within a closed metal case. Do not place the antenna in close vicinity to the end user since the emitted radiation in human tissue is restricted by regulatory requirements. Place the antenna as far as possible from VCC supply line and related parts (refer to Figure 28), from high speed digital lines (as USB) and from any possible noise source. Place the antenna far from sensitive analog systems or employ countermeasures to reduce EMC or EMI issues. Be aware of interaction between co-located RF systems since the LTE transmitted power may interact or disturb the performance of companion systems. UBX-16029218 - R11 Design-in Page 62 of 116 SARA-R4/N4 series - System Integration Manual Examples of antennas Table 22 lists some examples of possible internal on-board surface-mount antennas. Manufacturer Part Number Product Name Description Taoglas PA.710.A Warrior GSM / WCDMA / LTE SMD Antenna 698..960 MHz, 1710..2170 MHz, 2300..2400 MHz, 2490..2690 MHz 40.0 x 6.0 x 5.0 mm Taoglas PCS.06.A Havok GSM / WCDMA / LTE SMD Antenna 698..960 MHz, 1710..2170 MHz, 2500..2690 MHz 42.0 x 10.0 x 3.0 mm Taoglas MCS6.A Antenova SR4L002 Ethertronics P822601 GSM / WCDMA / LTE SMD Antenna 698..960 MHz, 1710..2170 MHz, 2490..2700 MHz 50.0 x 8.0 x 3.2 mm Ethertronics P822602 GSM / WCDMA / LTE SMD Antenna 698..960 MHz, 1710..2170 MHz, 2490..2700 MHz 50.0 x 8.0 x 3.2 mm Ethertronics 1002436 GSM / WCDMA / LTE Vertical Mount Antenna 698..960 MHz, 1710..2700 MHz 50.6 x 19.6 x 1.6 mm Pulse W3796 GSM / WCDMA / LTE SMD Antenna 698..960 MHz, 1710..2690 MHz 42.0 x 10.0 x 3.0 mm Lucida Domino GSM / WCDMA / LTE SMD Antenna 698..960 MHz, 1710..2170 MHz, 2300..2400 MHz, 2490..2690 MHz 35.0 x 8.5 x 3.2 mm GSM / WCDMA / LTE SMD Antenna 698..960 MHz, 1427..1661 MHz, 1695..2200 MHz, 2300..2700 MHz 42.0 x 10.0 x 3.0 mm TE Connectivity 2118310-1 GSM / WCDMA / LTE Vertical Mount Antenna 698..960 MHz, 1710..2170 MHz, 2300..2700 MHz 74.0 x 10.6 x 1.6 mm Molex 1462000001 GSM / WCDMA / LTE SMD Antenna 698..960 MHz, 1700..2700 MHz 40.0 x 5.0 x 5.0 mm Cirocomm DPAN0S07 GSM / WCDMA / LTE SMD Antenna 698..960 MHz, 1710..2170 MHz, 2500..2700 MHz 37.0 x 5.0 x 5.0 mm Table 22: Examples of internal surface-mount antennas UBX-16029218 - R11 Design-in Page 63 of 116 SARA-R4/N4 series - System Integration Manual Table 23 lists some examples of possible internal off-board PCB-type antennas with cable and connector. Manufacturer Part Number Product Name Description Taoglas FXUB63.07.0150C GSM / WCDMA / LTE PCB Antenna with cable and U.FL 698..960 MHz, 1575.42 MHz, 1710..2170 MHz, 2400..2690 MHz 96.0 x 21.0 mm Taoglas FXUB66.07.0150C Maximus GSM / WCDMA / LTE PCB Antenna with cable and U.FL 698..960 MHz, 1390..1435 MHz, 1575.42 MHz, 1710..2170 MHz, 2400..2700 MHz, 3400..3600 MHz, 4800..6000 MHz 120.2 x 50.4 mm Antenova SRFL029 Moseni GSM / WCDMA / LTE Antenna on flexible PCB with cable and U.FL 689..960 MHz, 1710..2170 MHz, 2300..2400 MHz, 2500..2690 MHz 110.0 x 20.0 mm Antenova SRFL026 Mitis GSM / WCDMA / LTE Antenna on flexible PCB with cable and U.FL 689..960 MHz, 1710..2170 MHz, 2300..2400 MHz, 2500..2690 MHz 110.0 x 20.0 mm Ethertronics 1002289 GSM / WCDMA / LTE Antenna on flexible PCB with cable and U.FL 698..960 MHz, 1710..2700 MHz 140.0 x 75.0 mm EAD FSQS35241-UF-10 SQ7 GSM / WCDMA / LTE PCB Antenna with cable and U.FL 690..960 MHz, 1710..2170 MHz, 2500..2700 MHz 110.0 x 21.0 mm Table 23: Examples of internal antennas with cable and connector Table 24 lists some examples of possible external antennas. Manufacturer Part Number Product Name Taoglas GSA.8827.A.101111 Phoenix GSM / WCDMA / LTE adhesive-mount antenna with cable and SMA(M) 698..960 MHz, 1575.42 MHz, 1710..2170 MHz, 2490..2690 MHz 105 x 30 x 7.7 mm Taoglas TG.30.8112 GSM / WCDMA / LTE swivel dipole antenna with SMA(M) 698..960 MHz, 1575.42 MHz, 1710..2170 MHz, 2400..2700 MHz 148.6 x 49 x 10 mm Taoglas MA241.BI.001 Laird Tech. TRA6927M3PW001 GSM / WCDMA / LTE screw-mount antenna with N-type(F) 698..960 MHz, 1710..2170 MHz, 2300..2700 MHz 83.8 x Ø 36.5 mm Laird Tech. CMS69273 GSM / WCDMA / LTE ceiling-mount antenna with cable and N-type(F) 698..960 MHz, 1575.42 MHz, 1710..2700 MHz 86 x Ø 199 mm Laird Tech. OC69271-FNM GSM / WCDMA / LTE pole-mount antenna with N-type(M) 698..960 MHz, 1710..2690 MHz 248 x Ø 24.5 mm Pulse Electronics WA700/2700SMA GSM / WCDMA / LTE clip-mount MIMO antenna with cables and SMA(M) 698..960 MHz,1710..2700 MHz 149 x 127 x 5.1 mm Genesis Description GSM / WCDMA / LTE MIMO 2in1 adhesive-mount combination antenna waterproof IP67 rated with cable and SMA(M) 698..960 MHz, 1710..2170 MHz, 2400..2700 MHz 205.8 x 58 x 12.4 mm Table 24: Examples of external antennas UBX-16029218 - R11 Design-in Page 64 of 116 SARA-R4/N4 series - System Integration Manual 2.4.2 Antenna detection interface (ANT_DET) 2.4.2.1 Guidelines for ANT_DET circuit design Figure 35 and Table 25 describe the recommended schematic / components for the antenna detection circuit that must be provided on the application board and for the diagnostic circuit that must be provided on the antenna’s assembly to achieve antenna detection functionality. Diagnostic Circuit SARA-R4/N4 ANT 56 Z0 = 50 Ω C3 C2 L2 ANT_DET 62 Z0 = 50 ohm Z0 = 50 Ω J1 R1 Antenna Cable Radiating Element C4 L3 L1 R2 C1 D1 GND Application Board Antenna Assembly Figure 35: Suggested schematic for antenna detection circuit on application PCB and diagnostic circuit on antenna assembly Reference Description Part Number - Manufacturer C1 27 pF Capacitor Ceramic C0G 0402 5% 50 V GRM1555C1H270J - Murata C2 33 pF Capacitor Ceramic C0G 0402 5% 50 V GRM1555C1H330J - Murata D1 Very Low Capacitance ESD Protection PESD0402-140 - Tyco Electronics L1 68 nH Multilayer Inductor 0402 (SRF ~1 GHz) LQG15HS68NJ02 - Murata R1 10 k Resistor 0402 1% 0.063 W RK73H1ETTP1002F - KOA Speer J1 SMA Connector 50 Through Hole Jack SMA6251A1-3GT50G-50 - Amphenol C3 15 pF Capacitor Ceramic C0G 0402 5% 50 V GRM1555C1H150J - Murata L2 39 nH Multilayer Inductor 0402 (SRF ~1 GHz) LQG15HN39NJ02 - Murata C4 22 pF Capacitor Ceramic C0G 0402 5% 25 V GRM1555C1H220J - Murata L3 68 nH Multilayer Inductor 0402 (SRF ~1 GHz) LQG15HS68NJ02 - Murata R2 15 k Resistor for Diagnostics Various Manufacturers Table 25: Suggested parts for antenna detection circuit on application PCB and diagnostic circuit on antennas assembly The antenna detection circuit and diagnostic circuit suggested in Figure 35 and Table 25 are here explained: When antenna detection is forced by the +UANTR AT command, the ANT_DET pin generates a DC current measuring the resistance (R2) from the antenna connector (J1) provided on the application board to GND. DC blocking capacitors are needed at the ANT pin (C2) and at the antenna radiating element (C4) to decouple the DC current generated by the ANT_DET pin. Choke inductors with a Self Resonance Frequency (SRF) in the range of 1 GHz are needed in series at the ANT_DET pin (L1) and in series at the diagnostic resistor (L3), to avoid a reduction of the RF performance of the system, improving the RF isolation of the load resistor. Resistor on the ANT_DET path (R1) is needed for accurate measurements through the +UANTR AT command. It also acts as an ESD protection. Additional components (C1 and D1 in Figure 35) are needed at the ANT_DET pin as ESD protection. Additional high pass filter (C3 and L2 in Figure 35) is provided at the ANT pin as ESD immunity improvement The ANT pin must be connected to the antenna connector by means of a transmission line with nominal characteristics impedance as close as possible to 50 . UBX-16029218 - R11 Design-in Page 65 of 116 SARA-R4/N4 series - System Integration Manual The DC impedance at RF port for some antennas may be a DC open (e.g. linear monopole) or a DC short to reference GND (e.g. PIFA antenna). For those antennas, without the diagnostic circuit of Figure 35, the measured DC resistance is always at the limits of the measurement range (respectively open or short), and there is no mean to distinguish between a defect on antenna path with similar characteristics (respectively: removal of linear antenna or RF cable shorted to GND for PIFA antenna). Furthermore, any other DC signal injected to the RF connection from ANT connector to radiating element will alter the measurement and produce invalid results for antenna detection. ☞ It is recommended to use an antenna with a built-in diagnostic resistor in the range from 5 k to 30 k to assure good antenna detection functionality and avoid a reduction of module RF performance. The choke inductor should exhibit a parallel Self Resonance Frequency (SRF) in the range of 1 GHz to improve the RF isolation of load resistor. For example: Consider an antenna with built-in DC load resistor of 15 k. Using the +UANTR AT command, the module reports the resistance value evaluated from the antenna connector provided on the application board to GND: ☞ Reported values close to the used diagnostic resistor nominal value (i.e. values from 13 k to 17 k if a 15 k diagnostic resistor is used) indicate that the antenna is correctly connected. Values close to the measurement range maximum limit (approximately 50 k) or an open-circuit “over range” report (see the SARA-R4/N4 series AT Commands Manual [2]) means that that the antenna is not connected or the RF cable is broken. Reported values below the measurement range minimum limit (1 k) highlights a short to GND at antenna or along the RF cable. Measurement inside the valid measurement range and outside the expected range may indicate an unclean connection, a damaged antenna or incorrect value of the antenna load resistor for diagnostics. Reported value could differ from the real resistance value of the diagnostic resistor mounted inside the antenna assembly due to antenna cable length, antenna cable capacity and the used measurement method. If the antenna detection function is not required by the customer application, the ANT_DET pin can be left not connected and the ANT pin can be directly connected to the antenna connector by means of a 50 transmission line as described in Figure 34. UBX-16029218 - R11 Design-in Page 66 of 116 SARA-R4/N4 series - System Integration Manual 2.4.2.2 Guidelines for ANT_DET layout design Figure 36 describes the recommended layout for the antenna detection circuit to be provided on the application board to achieve antenna detection functionality, implementing the recommended schematic described in the previous Figure 35 and Table 25: The ANT pin must be connected to the antenna connector by means of a 50 transmission line, implementing the design guidelines described in section 2.4.1 and the recommendations of the SMA connector manufacturer. DC blocking capacitor at ANT pin (C2) must be placed in series to the 50 RF line. The ANT_DET pin must be connected to the 50 transmission line by means of a sense line. Choke inductor in series at the ANT_DET pin (L1) must be placed so that one pad is on the 50 transmission line and the other pad represents the start of the sense line to the ANT_DET pin. The additional components (R1, C1 and D1) on the ANT_DET line must be placed as ESD protection. The additional high pass filter (C3 and L2) on the ANT line are placed as ESD immunity improvement SARA module R1 D1 C1 C3 L2 C2 L1 J1 Figure 36: Suggested layout for antenna detection circuit on application board UBX-16029218 - R11 Design-in Page 67 of 116 SARA-R4/N4 series - System Integration Manual 2.5 SIM interface 2.5.1 Guidelines for SIM circuit design 2.5.1.1 Guidelines for SIM cards, SIM connectors and SIM chips selection The ISO/IEC 7816, the ETSI TS 102 221 and the ETSI TS 102 671 specifications define the physical, electrical and functional characteristics of Universal Integrated Circuit Cards (UICC), which contains the Subscriber Identification Module (SIM) integrated circuit that securely stores all the information needed to identify and authenticate subscribers over the LTE network. Removable UICC / SIM card contacts mapping is defined by ISO/IEC 7816 and ETSI TS 102 221 as follows: Contact C1 = VCC (Supply) Contact C2 = RST (Reset) Contact C3 = CLK (Clock) Contact C4 = AUX1 (Auxiliary contact) Contact C5 = GND (Ground) Contact C6 = VPP (Programming supply) Contact C7 = I/O (Data input/output) Contact C8 = AUX2 (Auxiliary contact) It must be connected to VSIM It must be connected to SIM_RST It must be connected to SIM_CLK It must be left not connected It must be connected to GND It can be left not connected It must be connected to SIM_IO It must be left not connected A removable SIM card can have 6 contacts (C1, C2, C3, C5, C6, C7) or 8 contacts, also including the auxiliary contacts C4 and C8. Only 6 contacts are required and must be connected to the module SIM interface. Removable SIM cards are suitable for applications requiring a change of SIM card during the product lifetime. A SIM card holder can have 6 or 8 positions if a mechanical card presence detector is not provided, or it can have 6+2 or 8+2 positions if two additional pins relative to the normally-open mechanical switch integrated in the SIM connector for the mechanical card presence detection are provided. Select a SIM connector providing 6+2 or 8+2 positions if the optional SIM detection feature is required by the custom application, otherwise a connector without integrated mechanical presence switch can be selected. Solderable UICC / SIM chip contact mapping (M2M UICC Form Factor) is defined by ETSI TS 102 671 as: Case Pin 8 = UICC Contact C1 = VCC (Supply) Case Pin 7 = UICC Contact C2 = RST (Reset) Case Pin 6 = UICC Contact C3 = CLK (Clock) Case Pin 5 = UICC Contact C4 = AUX1 (Aux.contact) Case Pin 1 = UICC Contact C5 = GND (Ground) Case Pin 2 = UICC Contact C6 = VPP (Progr. supply) Case Pin 3 = UICC Contact C7 = I/O (Data I/O) Case Pin 4 = UICC Contact C8 = AUX2 (Aux. contact) It must be connected to VSIM It must be connected to SIM_RST It must be connected to SIM_CLK It must be left not connected It must be connected to GND It can be left not connected It must be connected to SIM_IO It must be left not connected A solderable SIM chip has 8 contacts and can also include the auxiliary contacts C4 and C8 for other uses, but only 6 contacts are required and must be connected to the module SIM card interface as described above. Solderable SIM chips are suitable for M2M applications where it is not required to change the SIM once installed. UBX-16029218 - R11 Design-in Page 68 of 116 SARA-R4/N4 series - System Integration Manual 2.5.1.2 Guidelines for single SIM card connection without detection A removable SIM card placed in a SIM card holder must be connected to the SIM card interface of SARA-R4/N4 series modules as described in Figure 37, where the optional SIM detection feature is not implemented. Follow these guidelines to connect the module to a SIM connector without SIM presence detection: Connect the UICC / SIM contacts C1 (VCC) to the VSIM pin of the module. Connect the UICC / SIM contact C7 (I/O) to the SIM_IO pin of the module. Connect the UICC / SIM contact C3 (CLK) to the SIM_CLK pin of the module. Connect the UICC / SIM contact C2 (RST) to the SIM_RST pin of the module. Connect the UICC / SIM contact C5 (GND) to ground. Provide a 100 nF bypass capacitor (e.g. Murata GRM155R71C104K) on SIM supply line, close to the relative pad of the SIM connector, to prevent digital noise. Provide a bypass capacitor of about 22 pF to 47 pF (e.g. Murata GRM1555C1H470J) on each SIM line, very close to each related pad of the SIM connector, to prevent RF coupling especially in case the RF antenna is placed closer than 10 - 30 cm from the SIM card holder. Provide a very low capacitance (i.e. less than 10 pF) ESD protection (e.g. Tyco PESD0402-140) on each externally accessible SIM line, close to each relative pad of the SIM connector. ESD sensitivity rating of the SIM interface pins is 1 kV (HBM). So that, according to EMC/ESD requirements of the custom application, higher protection level can be required if the lines are externally accessible on the application device. Limit capacitance and series resistance on each SIM signal to match the SIM requirements (18.7 ns is the maximum allowed rise time on clock line, 1.0 µs is the maximum allowed rise time on data and reset lines). SIM CARD HOLDER SARA-R4/N4 VPP (C6) VSIM 41 VCC (C1) SIM_IO 39 C C C C 5 6 7 8 IO (C7) SIM_CLK 38 CLK (C3) SIM_RST 40 RST (C2) C1 C2 C3 C4 C5 GND (C5) D1 D2 D3 D4 C C C C 1 2 3 4 SIM Card Bottom View (contacts side) J1 Figure 37: Application circuits for the connection to a single removable SIM card, with SIM detection not implemented Reference Description Part Number - Manufacturer C1, C2, C3, C4 47 pF Capacitor Ceramic C0G 0402 5% 50 V GRM1555C1H470JA01 - Murata C5 100 nF Capacitor Ceramic X7R 0402 10% 16 V GRM155R71C104KA01 - Murata D1, D2, D3, D4 Very Low Capacitance ESD Protection PESD0402-140 - Tyco Electronics J1 SIM Card Holder, 6 p, without card presence switch Various manufacturers, as C707 10M006 136 2 Amphenol Table 26: Example of components for the connection to a single removable SIM card, with SIM detection not implemented UBX-16029218 - R11 Design-in Page 69 of 116 SARA-R4/N4 series - System Integration Manual 2.5.1.3 Guidelines for single SIM chip connection A solderable SIM chip (M2M UICC Form Factor) must be connected the SIM card interface of the SARA-R4/N4 series modules as described in Figure 38. Follow these guidelines to connect the module to a solderable SIM chip without SIM presence detection: Connect the UICC / SIM contacts C1 (VCC) to the VSIM pin of the module. Connect the UICC / SIM contact C7 (I/O) to the SIM_IO pin of the module. Connect the UICC / SIM contact C3 (CLK) to the SIM_CLK pin of the module. Connect the UICC / SIM contact C2 (RST) to the SIM_RST pin of the module. Connect the UICC / SIM contact C5 (GND) to ground. Provide a 100 nF bypass capacitor (e.g. Murata GRM155R71C104K) at the SIM supply line close to the relative pad of the SIM chip, to prevent digital noise. Provide a bypass capacitor of about 22 pF to 47 pF (e.g. Murata GRM1555C1H470J) on each SIM line, to prevent RF coupling especially in case the RF antenna is placed closer than 10 - 30 cm from the SIM lines. Limit capacitance and series resistance on each SIM signal to match the SIM requirements (18.7 ns is the maximum allowed rise time on clock line, 1.0 µs is the maximum allowed rise time on data and reset lines). SARA-R4/N4 SIM CHIP 2 VSIM 41 8 SIM_IO 39 3 SIM_CLK 38 6 SIM_RST 40 7 1 C1 C2 C3 C4 C5 VPP (C6) VCC (C1) IO (C7) CLK (C3) RST (C2) GND (C5) 8 C1 C5 1 7 C2 C6 2 6 C3 C7 3 5 C4 C8 4 SIM Chip Bottom View (contacts side) U1 Figure 38: Application circuits for the connection to a single solderable SIM chip, with SIM detection not implemented Reference Description Part Number - Manufacturer C1, C2, C3, C4 47 pF Capacitor Ceramic C0G 0402 5% 50 V GRM1555C1H470JA01 - Murata C5 100 nF Capacitor Ceramic X7R 0402 10% 16 V GRM155R71C104KA01 - Murata U1 SIM chip (M2M UICC Form Factor) Various Manufacturers Table 27: Example of components for the connection to a single solderable SIM chip, with SIM detection not implemented 2.5.1.4 Guidelines for single SIM card connection with detection An application circuit for the connection to a single removable SIM card placed in a SIM card holder is described in Figure 39, where the optional SIM card detection feature is implemented. Follow these guidelines connecting the module to a SIM connector implementing SIM presence detection: Connect the UICC / SIM contacts C1 (VCC) to the VSIM pin of the module. Connect the UICC / SIM contact C7 (I/O) to the SIM_IO pin of the module. Connect the UICC / SIM contact C3 (CLK) to the SIM_CLK pin of the module. Connect the UICC / SIM contact C2 (RST) to the SIM_RST pin of the module. Connect the UICC / SIM contact C5 (GND) to ground. UBX-16029218 - R11 Design-in Page 70 of 116 SARA-R4/N4 series - System Integration Manual Connect one pin of the normally-open mechanical switch integrated in the SIM connector (as the SW2 pin in Figure 39) to the GPIO5 input pin, providing a weak pull-down resistor (e.g. 470 k, as R2 in Figure 39). Connect the other pin of the normally-open mechanical switch integrated in the SIM connector (SW1 pin in Figure 39) to V_INT 1.8 V supply output by means of a strong pull-up resistor (e.g. 1 k, as R1 in Figure 39) Provide a 100 nF bypass capacitor (e.g. Murata GRM155R71C104K) at the SIM supply line (VSIM), close to the related pad of the SIM connector, to prevent digital noise. Provide a bypass capacitor of about 22 pF to 47 pF (e.g. Murata GRM1555C1H470J) on each SIM line (VSIM, SIM_CLK, SIM_IO, SIM_RST), very close to each related pad of the SIM connector, to prevent RF coupling especially in case the RF antenna is placed closer than 10 - 30 cm from the SIM card holder. Provide a low capacitance (i.e. less than 10 pF) ESD protection (e.g. Tyco Electronics PESD0402-140) on each externally accessible SIM line, close to each related pad of the SIM connector. The ESD sensitivity rating of SIM interface pins is 1 kV (HBM according to JESD22-A114), so that, according to the EMC/ESD requirements of the custom application, higher protection level can be required if the lines are externally accessible. Limit capacitance and series resistance on each SIM signal to match the requirements for the SIM interface (18.7 ns = maximum rise time on SIM_CLK, 1.0 µs = maximum rise time on SIM_IO and SIM_RST). SIM CARD HOLDER SARA-R4/N4 V_INT TP 4 R1 GPIO5 42 R2 VSIM 41 SW1 SW2 VPP (C6) VCC (C1) SIM_IO 39 IO (C7) SIM_CLK 38 CLK (C3) SIM_RST 40 RST (C2) C1 C2 C3 C4 C5 GND (C5) D1 D2 D3 D4 D5 D6 C C C C 5 6 7 8 C C C C 1 2 3 4 SIM Card Bottom View (contacts side) J1 Figure 39: Application circuit for the connection to a single removable SIM card, with SIM detection implemented Reference Description Part Number - Manufacturer C1, C2, C3, C4 47 pF Capacitor Ceramic C0G 0402 5% 50 V GRM1555C1H470JA01 - Murata C5 100 nF Capacitor Ceramic X7R 0402 10% 16 V GRM155R71C104KA01 - Murata D1 – D6 Very Low Capacitance ESD Protection PESD0402-140 - Tyco Electronics R1 1 k Resistor 0402 5% 0.1 W RC0402JR-071KL - Yageo Phycomp R2 470 k Resistor 0402 5% 0.1 W RC0402JR-07470KL- Yageo Phycomp J1 SIM Card Holder 6 + 2 positions, with card presence switch Various Manufacturers, CCM03-3013LFT R102 - C&K Components Table 28: Example of components for the connection to a single removable SIM card, with SIM detection implemented UBX-16029218 - R11 Design-in Page 71 of 116 SARA-R4/N4 series - System Integration Manual 2.5.2 Guidelines for SIM layout design The layout of the SIM card interface lines (VSIM, SIM_CLK, SIM_IO, SIM_RST may be critical if the SIM card is placed far away from the SARA-R4/N4 series modules or in close proximity to the RF antenna: these two cases should be avoided or at least mitigated as described below. In the first case, the long connection can cause the radiation of some harmonics of the digital data frequency as any other digital interface. It is recommended to keep the traces short and avoid coupling with RF line or sensitive analog inputs. In the second case, the same harmonics can be picked up and create self-interference that can reduce the sensitivity of LTE receiver channels whose carrier frequency is coincidental with harmonic frequencies. It is strongly recommended to place the RF bypass capacitors suggested in Figure 37 near the SIM connector. In addition, since the SIM card is typically accessed by the end user, it can be subjected to ESD discharges. Add adequate ESD protection as suggested to protect module SIM pins near the SIM connector. Limit capacitance and series resistance on each SIM signal to match the SIM specifications. The connections should always be kept as short as possible. Avoid coupling with any sensitive analog circuit, since the SIM signals can cause the radiation of some harmonics of the digital data frequency. UBX-16029218 - R11 Design-in Page 72 of 116 SARA-R4/N4 series - System Integration Manual 2.6 Data communication interfaces 2.6.1 UART interface 2.6.1.1 Guidelines for UART circuit design Providing the full RS-232 functionality (using the complete V.24 link)12 If RS-232 compatible signal levels are needed, two different external voltage translators can be used to provide full RS-232 (9 lines) functionality: e.g. using the Texas Instruments SN74AVC8T245PW for the translation from 1.8 V to 3.3 V, and the Maxim MAX3237E for the translation from 3.3 V to RS-232 compatible signal level. If a 1.8 V Application Processor (DTE) is used and complete RS-232 functionality is required, then the complete 1.8 V UART of the module (DCE) should be connected to a 1.8 V DTE, as in Figure 40. Application Processor (1.8V DTE) SARA-R4/N4 (1.8V DCE) TxD 0Ω TP 0Ω TP 0Ω TP 0Ω TP 12 TXD 13 RXD 10 RTS 11 CTS DTR 9 DTR DSR 6 DSR RI 7 RI DCD 8 DCD RxD RTS CTS GND GND Figure 40: UART interface application circuit with complete V.24 link in DTE/DCE serial communication (1.8V DTE) If a 3.0 V Application Processor (DTE) is used, then it is recommended to connect the 1.8 V UART of the module (DCE) by means of appropriate unidirectional voltage translators using the module V_INT output as 1.8 V supply for the voltage translators on the module side, as described in Figure 41. Application Processor (3.0V DTE) Unidirectional Voltage Translator 3V0 VCC C1 VCCA DIR1 DIR3 VCCB TxD A1 B1 RxD A2 B2 RTS A3 B3 CTS A4 DIR2 DIR4 B4 C3 VCCA TP C2 0Ω TP 0Ω TP 0Ω TP 0Ω TP 4 V_INT 12 TXD 13 RXD 10 RTS 11 CTS OE GND U1 Unidirectional Voltage Translator 3V0 SARA-R4/N4 (1.8V DCE) 1V8 VCCB DIR1 1V8 C4 DTR A1 B1 9 DTR DSR A2 B2 6 DSR RI A3 B3 7 RI DCD A4 B4 8 DCD GND DIR2 DIR3 DIR4 OE GND GND U2 Figure 41: UART interface application circuit with complete V.24 link in DTE/DCE serial communication (3.0 V DTE) Reference Description Part Number - Manufacturer C1, C2, C3, C4 100 nF Capacitor Ceramic X7R 0402 10% 16 V GRM155R61A104KA01 - Murata U1, U2 Unidirectional Voltage Translator SN74AVC4T77413 - Texas Instruments Table 29: Component for UART application circuit with complete V.24 link in DTE/DCE serial communication (3.0 V DTE) 12 Flow control is not supported by ‘00’, ‘01’ and SARA-R410M-02B product versions, but the RTS input must be set low to use the UART on ‘00’ and ‘01’ versions. The DTR input must be set low to have URCs presented over UART on ‘00’, ‘01’ and ‘x2’ product versions. 13 Voltage translator providing partial power down feature so that the DTE 3 V supply can be also ramped up before V_INT 1.8 V supply UBX-16029218 - R11 Design-in Page 73 of 116 SARA-R4/N4 series - System Integration Manual Providing the TXD, RXD, RTS, CTS and DTR lines only 14 If the functionality of the DSR, DCD and RI lines is not required, or the lines are not available: Leave DSR, DCD and RI lines of the module floating, with a test-point on DCD If RS-232 compatible signal levels are needed, two different external voltage translators (e.g. Maxim MAX3237E and Texas Instruments SN74AVC4T774) can be used. The Texas Instruments chips provide the translation from 1.8 V to 3.3 V, while the Maxim chip provides the translation from 3.3 V to RS-232 compatible signal level. Figure 42 describes the circuit that should be implemented as if a 1.8 V Application Processor (DTE) is used, given that the DTE will behave correctly regardless of the DSR input setting. Application Processor (1.8V DTE) SARA-R4/N4 (1.8V DCE) TxD RxD RTS CTS 0Ω TP 0Ω TP 0Ω TP 0Ω TP 12 TXD 13 RXD 10 RTS 11 CTS DTR 9 DTR DSR 6 DSR RI 7 RI DCD 8 DCD GND GND Figure 42: UART interface application circuit with partial V.24 link (6-wire) in the DTE/DCE serial communication (1.8 V DTE) If a 3.0 V Application Processor (DTE) is used, then it is recommended to connect the 1.8 V UART interface of the module (DCE) by means of appropriate unidirectional voltage translators using the module V_INT output as 1.8 V supply for the voltage translators on the module side, as described in Figure 43, given that the DTE will behave correctly regardless of the DSR input setting. Application Processor (3.0V DTE) VCC Unidirectional Voltage Translator 3V0 VCCA DIR1 DIR3 C1 VCCB TxD A1 B1 RxD A2 B2 RTS A3 B3 CTS A4 DIR2 DIR4 SARA-R4/N4 (1.8V DCE) 1V8 C2 0Ω TP 0Ω 0Ω TP TP 0Ω TP 4 V_INT 12 TXD 13 RXD 10 RTS 11 CTS B1 B2 9 DTR 6 DSR OE GND 7 RI 8 DCD B4 OE GND U1 Unidirectional Voltage Translator 3V0 C3 DTR DSR VCCA DIR1 A1 A2 RI DCD U2 VCCB DIR2 1V8 C4 GND GND Figure 43: UART interface application circuit with partial V.24 link (6-wire) in DTE/DCE serial communication (3.0 V DTE) Reference Description Part Number - Manufacturer C1, C2, C3, C4 100 nF Capacitor Ceramic X7R 0402 10% 16 V GRM155R61A104KA01 - Murata U1 Unidirectional Voltage Translator SN74AVC4T77415 - Texas Instruments U2 Unidirectional Voltage Translator SN74AVC2T24515 - Texas Instruments Table 30: UART application circuit components with partial V.24 link (6-wire) in DTE/DCE serial communication (3.0 V DTE) 14 Flow control is not supported by ‘00’, ‘01’ and SARA-R410M-02B product versions, but the RTS input must be set low to use the UART on ‘00’ and ‘01’ versions. The DTR input must be set low to have URCs presented over UART on ‘00’, ‘01’ and ‘x2’ product versions. 15 Voltage translator providing partial power down feature so that the DTE 3 V supply can be also ramped up before V_INT 1.8 V supply UBX-16029218 - R11 Design-in Page 74 of 116 SARA-R4/N4 series - System Integration Manual Providing the TXD, RXD, RTS and CTS lines only 16 If the functionality of the DSR, DCD, RI and DTR lines is not required, or the lines are not available: Connect the module DTR input to GND using a 0 series resistor, since it may be useful to set DTR active if not specifically handled, in particular to have URCs presented over the UART interface (see the SARA-R4/N4 series AT Commands Manual [1] for the &D, S0, +CNMI AT commands) Leave DSR, DCD and RI lines of the module floating, with a test-point on DCD If RS-232 compatible signal levels are needed, the Maxim MAX13234E voltage level translator can be used. This chip translates voltage levels from 1.8 V (module side) to the RS-232 standard. If a 1.8 V Application Processor is used, the circuit should be implemented as described in Figure 44. Application Processor (1.8V DTE) SARA-R4/N4 (1.8V DCE) TxD RxD RTS CTS 0Ω TP 0Ω TP 0Ω TP 0Ω TP 12 TXD 13 RXD 10 RTS 11 CTS DTR 9 DTR DSR 6 DSR RI 7 RI DCD 8 DCD GND GND Figure 44: UART interface application circuit with partial V.24 link (5-wire) in the DTE/DCE serial communication (1.8V DTE) If a 3.0 V Application Processor (DTE) is used, then it is recommended to connect the 1.8 V UART interface of the module (DCE) by means of appropriate unidirectional voltage translators using the module V_INT output as 1.8 V supply for the voltage translators on the module side, as in Figure 45. Application Processor (3.0V DTE) VCC Unidirectional Voltage Translator 3V0 C1 VCCA DIR1 DIR3 VCCB SARA-R4/N4 (1.8V DCE) 1V8 TP C2 0Ω TP 0Ω TP 4 V_INT 12 TXD TxD A1 B1 RxD A2 B2 RTS A3 B3 10 RTS CTS A4 B4 11 CTS DIR2 DIR4 U1 DTR 13 RXD OE GND 0Ω TP 9 DTR DSR 6 DSR RI 7 RI 8 DCD DCD TP GND GND Figure 45: UART interface application circuit with a partial V.24 link (5-wire) in DTE/DCE serial communication (3.0 V DTE) Reference Description Part Number - Manufacturer C1, C2 100 nF Capacitor Ceramic X7R 0402 10% 16 V GRM155R61A104KA01 - Murata U1 Unidirectional Voltage Translator SN74AVC4T77417 - Texas Instruments Table 31: UART application circuit components with a partial V.24 link (5-wire) in DTE/DCE serial communication (3.0 V DTE) 16 Flow control is not supported by ‘00’, ‘01’ and SARA-R410M-02B product versions, but the RTS input must be set low to use the UART on ‘00’ and ‘01’ versions. The DTR input must be set low to have URCs presented over UART on ‘00’, ‘01’ and ‘x2’ product versions. 17 Voltage translator providing partial power down feature so that the DTE 3 V supply can be also ramped up before V_INT 1.8 V supply UBX-16029218 - R11 Design-in Page 75 of 116 SARA-R4/N4 series - System Integration Manual Providing the TXD and RXD lines only 18 If the functionality of the CTS, RTS, DSR, DCD, RI and DTR lines is not required in the application, or the lines are not available, then: Connect the module RTS input line to GND or to the CTS output line of the module, since the module requires RTS active (low electrical level) if HW flow-control is enabled (AT&K3, which is the default setting) Connect the module DTR input line to GND using a 0 series resistor, because it is useful to set DTR active if not specifically handled, in particular to have URCs presented over the UART interface (see SARA-R4/N4 series AT Commands Manual [1], &D, S0, +CNMI AT commands) Leave DSR, DCD and RI lines of the module floating, with a test-point on DCD If RS-232 compatible signal levels are needed, the Maxim MAX13234E voltage level translator can be used. This chip translates voltage levels from 1.8 V (module side) to the RS-232 standard. If a 1.8 V Application Processor (DTE) is used, the circuit that should be implemented as in Figure 46. Application Processor (1.8V DTE) SARA-R4/N4 (1.8V DCE) TxD RxD RTS 0Ω TP 0Ω TP 0Ω TP TP CTS 12 TXD 13 RXD 10 RTS 11 CTS DTR 9 DTR DSR 6 DSR RI 7 RI DCD 8 DCD GND GND Figure 46: UART interface application circuit with a 3-wire link in the DTE/DCE serial communication (1.8V DTE) If a 3.0 V Application Processor (DTE) is used, then it is recommended to connect the 1.8 V UART interface of the module (DCE) by means of appropriate unidirectional voltage translators using the module V_INT output as 1.8 V supply for the voltage translators on the module side, as in Figure 47. Application Processor (3.0V DTE) VCC Unidirectional Voltage Translator 3V0 C1 VCCA VCCB TxD A1 B1 A2 B2 DIR2 U1 RTS TP C2 DIR1 RxD SARA-R4/N4 (1.8V DCE) 1V8 0Ω TP 0Ω TP 0Ω TP V_INT 12 TXD 13 RXD OE GND TP CTS 4 10 RTS 11 CTS DTR 9 DTR DSR 6 DSR RI 7 RI DCD 8 DCD GND GND Figure 47: UART interface application circuit with a partial V.24 link (3-wire) in DTE/DCE serial communication (3.0 V DTE) Reference Description Part Number - Manufacturer C1, C2 100 nF Capacitor Ceramic X7R 0402 10% 16 V GRM155R61A104KA01 - Murata U1 Unidirectional Voltage Translator SN74AVC2T24519 - Texas Instruments Table 32: UART application circuit components with partial V.24 link (3-wire) in DTE/DCE serial communication (3.0 V DTE) 18 Flow control is not supported by ‘00’, ‘01’ and SARA-R410M-02B product versions, but the RTS input must be set low to use the UART on ‘00’ and ‘01’ versions. The DTR input must be set low to have URCs presented over UART on ‘00’, ‘01’ and ‘x2’ product versions. 19 Voltage translator providing partial power down feature so that the DTE 3 V supply can be also ramped up before V_INT 1.8 V supply UBX-16029218 - R11 Design-in Page 76 of 116 SARA-R4/N4 series - System Integration Manual Additional considerations If a 3.0 V Application Processor (DTE) is used, the voltage scaling from any 3.0 V output of the DTE to the corresponding 1.8 V input of the module (DCE) can be implemented as an alternative low-cost solution, by means of an appropriate voltage divider. Consider the value of the pull-down / pull-up integrated at the input of the module (DCE) for the correct selection of the voltage divider resistance values. Make sure that any DTE signal connected to the module is tri-stated or set low when the module is in power-down mode and during the module power-on sequence (at least until the activation of the V_INT supply output of the module), to avoid latch-up of circuits and allow a clean boot of the module (see the remark below). Moreover, the voltage scaling from any 1.8 V output of the cellular module (DCE) to the corresponding 3.0 V input of the Application Processor (DTE) can be implemented by means of an appropriate lowcost non-inverting buffer with open drain output. The non-inverting buffer should be supplied by the V_INT supply output of the cellular module. Consider the value of the pull-up integrated at each input of the DTE (if any) and the baud rate required by the application for the appropriate selection of the resistance value for the external pull-up biased by the application processor supply rail. ☞ The TXD data input line has an internal active pull-down enabled on the “00” and “02” product versions, and an internal active pull-up enabled on the “01” product version. ☞ Do not apply voltage to any UART interface pin before the switch-on of the UART supply source V_INT), to avoid latch-up of circuits and allow a clean boot of the module. If the external signals connected to the cellular module cannot be tri-stated or set low, insert a multi-channel digital switch (e.g. TI SN74CB3Q16244, TS5A3159, or TS5A63157) between the two-circuit connections and set to high impedance before V_INT switch-on. ☞ ESD sensitivity rating of the UART interface pins is 1 kV (Human Body Model according to JESD22A114). Higher protection levels could be required if the lines are externally accessible and it can be achieved by mounting an ESD protection (e.g. EPCOS CA05P4S14THSG varistor array) close to the accessible points. 2.6.1.2 Guidelines for UART layout design The UART serial interface requires the same consideration regarding electro-magnetic interference as any other digital interface. Keep the traces short and avoid coupling with RF line or sensitive analog inputs, since the signals can cause the radiation of some harmonics of the digital data frequency. UBX-16029218 - R11 Design-in Page 77 of 116 SARA-R4/N4 series - System Integration Manual 2.6.2 USB interface 2.6.2.1 Guidelines for USB circuit design The USB_D+ and USB_D- lines carry the USB serial data and signaling. The lines are used in singleended mode for full speed signaling handshake, as well as in differential mode for high speed signaling and data transfer. USB pull-up or pull-down resistors and external series resistors on USB_D+ and USB_D- lines as required by the USB 2.0 specification [4] are part of the module USB pins driver and do not need to be externally provided. The USB interface of the module is enabled only if a valid voltage is detected by the VUSB_DET input (see the SARA-R4/N4 series Data Sheet [1]). Neither the USB interface nor the whole module is supplied by the VUSB_DET input: the VUSB_DET senses the USB supply voltage and absorbs few microamperes. Routing the USB pins to a connector, they will be externally accessible on the application device. According to EMC/ESD requirements of the application, an additional ESD protection device with very low capacitance should be provided close to accessible point on the line connected to this pin, as described in Figure 48 and Table 33. ☞ The USB interface pins ESD sensitivity rating is 1 kV (Human Body Model according to JESD22A114F). Higher protection level could be required if the lines are externally accessible and it can be achieved by mounting a very low capacitance (i.e. less or equal to 1 pF) ESD protection (e.g. Tyco Electronics PESD0402-140 ESD protection device) on the lines connected to these pins, close to accessible points. The USB pins of the modules can be directly connected to the USB host application processor without additional ESD protections if they are not externally accessible or according to EMC/ESD requirements. USB DEVICE CONNECTOR VBUS 17 D+ DGND USB HOST PROCESSOR SARA-R4/N4 D1 D2 D3 C1 VUSB_DET VBUS 29 USB_D+ D+ 28 USB_D- D- GND GND SARA-R4/N4 0Ω Test-Point 0Ω Test-Point 0Ω Test-Point 17 VUSB_DET 29 USB_D+ 28 USB_D- C1 GND Figure 48: USB Interface application circuits Reference Description Part Number - Manufacturer C1 100 nF Capacitor Ceramic X7R 0402 10% 16 V GRM155R61A104KA01 - Murata D1, D2, D3 Very Low Capacitance ESD Protection PESD0402-140 - Tyco Electronics Table 33: Components for USB application circuits ☞ If the USB interface is enabled, the module does not enter the low power deep sleep mode: the external USB VBUS supply voltage needs to be removed from the VUSB_DET input of the module to let it enter the Power Saving Mode defined in 3GPP Rel.13. ☞ If the USB interface pins are not used, they can be left unconnected on the application board, but it is strongly recommended to provide accessible test points directly connected to the USB interface pins (VUSB_DET, USB_D+, USB_D-). UBX-16029218 - R11 Design-in Page 78 of 116 SARA-R4/N4 series - System Integration Manual 2.6.2.2 Guidelines for USB layout design The USB_D+ / USB_D- lines require accurate layout design to achieve reliable signaling at the high speed data rate (up to 480 Mb/s) supported by the USB serial interface. The characteristic impedance of the USB_D+ / USB_D- lines is specified by the Universal Serial Bus Revision 2.0 specification [4]. The most important parameter is the differential characteristic impedance applicable for the odd-mode electromagnetic field, which should be as close as possible to 90 differential. Signal integrity may be degraded if PCB layout is not optimal, especially when the USB signaling lines are very long. Use the following general routing guidelines to minimize signal quality problems: Route USB_D+ / USB_D- lines as a differential pair Route USB_D+ / USB_D- lines as short as possible Ensure the differential characteristic impedance (Z0) is as close as possible to 90 Ensure the common mode characteristic impedance (Z CM) is as close as possible to 30 Consider design rules for USB_D+ / USB_D- similar to RF transmission lines, being them coupled differential micro-strip or buried stripline: avoid any stubs, abrupt change of layout, and route on clear PCB area Figure 49 and Figure 50 provide two examples of coplanar waveguide designs with differential characteristic impedance close to 90 and common mode characteristic impedance close to 30 . The first transmission line can be implemented in case of 4-layer PCB stack-up herein described, the second transmission line can be implemented in case of 2-layer PCB stack-up herein described. 400 µm 350 µm 400 µm 350 µm 400 µm L1 Copper 35 µm FR-4 dielectric 270 µm L2 Copper 35 µm FR-4 dielectric 760 µm L3 Copper 35 µm FR-4 dielectric 270 µm L4 Copper 35 µm Figure 49: Example of USB line design, with Z0 close to 90 and ZCM close to 30 , for the described 4-layer board layup 410 µm 740 µm 410 µm 740 µm 410 µm L1 Copper 35 µm FR-4 dielectric 1510 µm L2 Copper 35 µm Figure 50: Example of USB line design, with Z0 close to 90 and ZCM close to 30 , for the described 2-layer board layup UBX-16029218 - R11 Design-in Page 79 of 116 SARA-R4/N4 series - System Integration Manual 2.6.3 SPI interface 2.6.3.1 Guidelines for SPI circuit design ☞ The SPI interface is not supported by “00”, “01”, “02” and “52” product versions: the SPI interface pins should not be driven by any external device. 2.6.4 SDIO interface 2.6.4.1 Guidelines for SDIO circuit design ☞ The SDIO interface is not supported by “00”, “01”, “02” and “52” product versions: the SDIO interface pins should not be driven by any external device. 2.6.5 DDC (I2C) interface 2.6.5.1 Guidelines for DDC (I2C) circuit design ☞ DDC (I2C) interface is not supported by “00” and “01” product versions: the DDC (I2C) interface pins should not be driven by any external device. The DDC I2C-bus master interface can be used to communicate with u-blox GNSS receivers and other external I2C-bus slaves as an audio codec. The SDA and SCL pins of the module are open drain output as per I2C bus specifications [9], and they have internal pull-up resistors to the V_INT 1.8 V supply rail of the module, so there is no need of additional pull-up resistors on the external application board. ☞ Capacitance and series resistance must be limited on the bus to match the I 2C specifications (1.0 µs is the maximum allowed rise time on the SCL and SDA lines): route connections as short as possible. ☞ ESD sensitivity rating of the DDC (I2C) pins is 1 kV (Human Body Model according to JESD22-A114). Higher protection level could be required if the lines are externally accessible and it can be achieved by mounting an ESD protection (e.g. EPCOS CA05P4S14THSG varistor array) close to accessible points. ☞ If the pins are not used as DDC bus interface, they can be left unconnected. UBX-16029218 - R11 Design-in Page 80 of 116 SARA-R4/N4 series - System Integration Manual Connection with u-blox 1.8 V GNSS receivers Figure 51 shows an application circuit for connecting the cellular module to a u-blox 1.8 V GNSS receiver: The SDA and SCL pins of the cellular module are directly connected to the related pins of the ublox 1.8 V GNSS receiver. External pull-up resistors are not needed, as they are already integrated in the cellular module. The GPIO2 pin is connected to the active-high enable pin of the voltage regulator that supplies the u-blox 1.8 V GNSS receiver providing the “GNSS supply enable” function. A pull-down resistor is provided to avoid a switch on of the positioning receiver when the cellular module is switched off or in the reset state. The GPIO3 pin is connected to the TXD1 pin of the u-blox 1.8 V GNSS receiver providing the additional “GNSS Tx data ready” function. u-blox GNSS 1.8 V receiver SARA-R4/N4 (except ’00’,’01’ versions) GNSS LDO VMAIN Regulator 1V8 VCC IN OUT SHDN C1 GNSS supply enabled GND 23 GPIO2 R1 U1 SDA2 26 SDA SCL2 27 SCL TxD1 GNSS data ready 24 GPIO3 Figure 51: Application circuit for connecting SARA-R4/N4 series modules to u-blox 1.8 V GNSS receivers Reference Description Part Number - Manufacturer R1 47 kΩ Resistor 0402 5% 0.1 W RC0402JR-0747KL - Yageo Phycomp U1 Voltage Regulator for GNSS receiver See GNSS receiver Hardware Integration Manual Table 34: Components for connecting SARA-R4/N4 series modules to u-blox 1.8 V GNSS receivers For additional guidelines regarding the design of applications with u-blox 1.8 V GNSS receivers, see the Hardware Integration Manual of the u-blox GNSS receivers. Connection with u-blox 3.0 V GNSS receivers Figure 52 shows an application circuit for connecting the cellular module to a u-blox 3.0 V GNSS receiver: As the SDA and SCL pins of the cellular module are not tolerant up to 3.0 V, the connection to the related I2C pins of the u-blox 3.0 V GNSS receiver must be provided using a suitable I 2C-bus Bidirectional Voltage Translator (e.g. TI TCA9406, which additionally provides the partial power down feature so that the GNSS 3.0 V supply can be ramped up before the V_INT 1.8 V cellular supply). External pull-up resistors are not needed on the cellular module side, as they are already integrated in the cellular module. The GPIO2 is connected to the active-high enable pin of the voltage regulator that supplies the ublox 3.0 V GNSS receiver providing the “GNSS supply enable” function. A pull-down resistor is provided to avoid a switch on of the positioning receiver when the cellular module is switched off or in the reset state. UBX-16029218 - R11 Design-in Page 81 of 116 SARA-R4/N4 series - System Integration Manual The GPIO3 pin is connected to the TXD1 pin of the u-blox 3.0 V GNSS receiver providing the additional “GNSS Tx data ready” function, using a suitable Unidirectional General Purpose Voltage Translator (e.g. TI SN74AVC2T245, which additionally provides the partial power down feature so that the 3.0 V GNSS supply can be also ramped up before the V_INT 1.8 V cellular supply. u-blox GNSS 3.0 V receiver SARA-R4/N4 3V0 LDO Regulator VCC C1 OUT IN GND SHDNn (except ‘00’,’01’ versions) VMAIN GNSS supply enabled I2C-bus Bidirectional Voltage Translator SDA2 R1 C2 R2 SCL2 23 GPIO2 R3 U1 VCCB 1V8 VCCA 4 C3 OE V_INT SDA_B SDA_A 26 SDA SCL_B SCL_A 27 SCL GND U2 Unidirectional Voltage Translator 3V0 C4 TxD1 VCCA DIR1 VCCB A1 B1 A2 B2 1V8 C5 GNSS data ready 24 GPIO3 DIR2 GND OEn U3 Figure 52: Application circuit for connecting SARA-R4/N4 series modules to u-blox 3.0 V GNSS receivers Reference Description Part Number - Manufacturer R1, R2 4.7 kΩ Resistor 0402 5% 0.1 W RC0402JR-074K7L - Yageo Phycomp R3 47 kΩ Resistor 0402 5% 0.1 W RC0402JR-0747KL - Yageo Phycomp C2, C3, C4, C5 100 nF Capacitor Ceramic X5R 0402 10% 10V GRM155R71C104KA01 - Murata U1, C1 Voltage Regulator for GNSS receiver and related output bypass capacitor See GNSS receiver Hardware Integration Manual U2 I2C-bus Bidirectional Voltage Translator TCA9406DCUR - Texas Instruments U3 Generic Unidirectional Voltage Translator SN74AVC2T245 - Texas Instruments Table 35: Components for connecting SARA-R4/N4 series modules to u-blox 3.0 V GNSS receivers For additional guidelines regarding the design of applications with u-blox 3.0 V GNSS receivers see the Hardware Integration Manual of the u-blox GNSS receivers. 2.6.5.2 Guidelines for DDC (I2C) layout design The DDC (I2C) serial interface requires the same consideration regarding electro-magnetic interference as any other digital interface. Keep the traces short and avoid coupling with RF line or sensitive analog inputs, since the signals can cause the radiation of some harmonics of the digital data frequency. 2.7 Audio 2.7.1 ☞ Guidelines for Audio circuit design Audio is not supported by “00”, “01”, “02” and “52” product versions: the I2S interface pins should not be driven by any external device. UBX-16029218 - R11 Design-in Page 82 of 116 SARA-R4/N4 series - System Integration Manual 2.8 General Purpose Input/Output 2.8.1 Guidelines for GPIO circuit design A typical usage of SARA-R4/N4 series modules’ GPIOs can be the following: Network indication provided over GPIO1 pin (see Figure 53 / Table 36 below) GNSS supply enable function provided by the GPIO2 pin (see section 2.6.5) GNSS Tx data ready function provided by the GPIO3 pin (see section 2.6.5) Module operating status indication provided by a GPIO pin (see section 1.6.1) SIM card detection provided over GPIO5 pin (see Figure 39 / Table 28 in section 2.5) 3V8 SARA-R4/N4 GPIO1 16 R3 Network Indicator DL1 R1 T1 R2 Figure 53: Application circuit for network indication provided over GPIO1 Reference Description Part Number - Manufacturer R1 10 k Resistor 0402 5% 0.1 W Various manufacturers R2 47 k Resistor 0402 5% 0.1 W Various manufacturers R3 820 Resistor 0402 5% 0.1 W Various manufacturers DL1 LED Red SMT 0603 LTST-C190KRKT - Lite-on Technology Corporation T1 NPN BJT Transistor BC847 - Infineon Table 36: Components for network indication application circuit ☞ Use transistors with at least an integrated resistor in the base pin or otherwise put a 10 k resistor on the board in series to the GPIO of SARA-R4/N4 series modules. ☞ Do not apply voltage to any GPIO of the module before the switch-on of the GPIOs supply (V_INT), to avoid latch-up of circuits and allow a clean module boot. If the external signals connected to the module cannot be tri-stated or set low, insert a multi-channel digital switch (e.g. TI SN74CB3Q16244, TS5A3159, TS5A63157) between the two-circuit connections and set to high impedance before V_INT switch-on. ☞ ESD sensitivity rating of the GPIO pins is 1 kV (Human Body Model according to JESD22-A114). Higher protection level could be required if the lines are externally accessible and it can be achieved by mounting an ESD protection (e.g. EPCOS CA05P4S14THSG varistor array) close to accessible points. ☞ If the GPIO pins are not used, they can be left unconnected on the application board. 2.8.2 Guidelines for general purpose input/output layout design The general purpose inputs / outputs pins are generally not critical for layout. UBX-16029218 - R11 Design-in Page 83 of 116 SARA-R4/N4 series - System Integration Manual 2.9 Reserved pins (RSVD) SARA-R4/N4 series modules have pins reserved for future use, marked as RSVD. All the RSVD pins are to be left unconnected on the application board, except for the RSVD pin number 33 that can be externally connected to ground. 2.10 Module placement An optimized placement allows a minimum RF line’s length and closer path from DC source for VCC. Make sure that the module, analog parts and RF circuits are clearly separated from any possible source of radiated energy. In particular, digital circuits can radiate digital frequency harmonics, which can produce Electro-Magnetic Interference that affects the module, analog parts and RF circuits’ performance. Implement suitable countermeasures to avoid any possible Electro-Magnetic Compatibility issue. Make sure that the module, RF and analog parts / circuits, and high speed digital circuits are clearly separated from any sensitive part / circuit which may be affected by Electro-Magnetic Interference, or employ countermeasures to avoid any possible Electro-Magnetic Compatibility issue. Make sure that the module is placed in order to keep the antenna as far as possible from VCC supply line and related parts (refer to Figure 28), from high speed digital lines (as USB) and from any possible noise source. Provide enough clearance between the module and any external part: clearance of at least 0.4 mm per side is recommended to let suitable mounting of the parts. ☞ The heat dissipation during continuous transmission at maximum power can significantly raise the temperature of the application base-board below the SARA-R4/N4 series modules: avoid placing temperature sensitive devices close to the module. UBX-16029218 - R11 Design-in Page 84 of 116 SARA-R4/N4 series - System Integration Manual 2.11 Module footprint and paste mask Figure 54 and Table 37 describe the suggested footprint (i.e. copper mask) and paste mask layout for SARA modules: the proposed land pattern layout reflects the modules’ pins layout, while the proposed stencil apertures layout is slightly different (see the F’’, H’’, I’’, J’’, O’’ parameters compared to the F’, H’, I’, J’, O’ ones). The Non Solder resist Mask Defined (NSMD) pad type is recommended over the Solder resist Mask Defined (SMD) pad type, as it implements the solder resist mask opening 50 µm larger per side than the corresponding copper pad. The recommended thickness of the stencil for the soldering paste is 150 µm, according to application production process requirements. B Pin 1 E G H’ J’ B ANT pin Pin 1 E I’ K D E G H’’ ANT pin J’’ E I’’ K M1 M1 M1 M1 M2 M2 O’ O’’ G O’ Stencil: 150 µm H’ A G O’’ H’’ A J’ K D F’ J’’ K D F’’ F’ L N D F’’ L L N L Figure 54: SARA-R4/N4 series modules suggested footprint and paste mask (application board top view) Parameter Value Parameter Value Parameter Value A 26.0 mm G 1.10 mm K 2.75 mm B 16.0 mm H’ 0.80 mm L 2.75 mm C 3.00 mm H’’ 0.75 mm M1 1.80 mm D 2.00 mm I’ 1.50 mm M2 3.60 mm E 2.50 mm I’’ 1.55 mm N 2.10 mm F’ 1.05 mm J’ 0.30 mm O’ 1.10 mm F’’ 1.00 mm J’’ 0.35 mm O’’ 1.05 mm Table 37: SARA-R4/N4 series modules suggested footprint and paste mask dimensions ☞ These are recommendations only and not specifications. The exact copper, solder and paste mask geometries, distances, stencil thicknesses and solder paste volumes must be adapted to the specific production processes (e.g. soldering etc.) of the customer. UBX-16029218 - R11 Design-in Page 85 of 116 SARA-R4/N4 series - System Integration Manual 2.12 Thermal guidelines ☞ The module operating temperature range is specified in the SARA-R4/N4 series Data Sheet [1]. The most critical condition concerning module thermal performance is the uplink transmission at maximum power (data upload in connected mode), when the baseband processor runs at full speed, radio circuits are all active and the RF power amplifier is driven to higher output RF power. This scenario is not often encountered in real networks (for example, see the Terminal Tx Power distribution for WCDMA, taken from operation on a live network, described in the GSMA TS.09 Battery Life Measurement and Current Consumption Technique [10]); however the application should be correctly designed to cope with it. During transmission at maximum RF power the SARA-R4/N4 series modules generate thermal power that may exceed 0.5 W: this is an indicative value since the exact generated power strictly depends on operating condition such as the actual antenna return loss, the transmitting frequency band, etc. The generated thermal power must be adequately dissipated through the thermal and mechanical design of the application. The spreading of the Module-to-Ambient thermal resistance (Rth,M-A) depends on the module operating condition. The overall temperature distribution is influenced by the configuration of the active components during the specific mode of operation and their different thermal resistance toward the case interface. ☞ The Module-to-Ambient thermal resistance value and the relative increase of module temperature will differ according to the specific mechanical deployments of the module, e.g. application PCB with different dimensions and characteristics, mechanical shells enclosure, or forced air flow. The increase of the thermal dissipation, i.e. the reduction of the Module-to-Ambient thermal resistance, will decrease the temperature of the modules’ internal circuitry for a given operating ambient temperature. This improves the device long-term reliability in particular for applications operating at high ambient temperature. Recommended hardware techniques to be used to improve heat dissipation in the application: Connect each GND pin with solid ground layer of the application PCB and connect each ground area of the multilayer application PCB with complete thermal via stacked down to main ground layer. Provide a ground plane as wide as possible on the application board. Optimize antenna return loss, to optimize overall electrical performance of the module including a decrease of module thermal power. Optimize the thermal design of any high-power components included in the application, such as linear regulators and amplifiers, to optimize overall temperature distribution in the application. Select the material, the thickness and the surface of the box (i.e. the mechanical enclosure) of the application device that integrates the module so that it provides good thermal dissipation. Beside the reduction of the Module-to-Ambient thermal resistance implemented by correct application hardware design, the increase of module temperature can be moderated by a correspondingly correct application software implementation: Enable power saving configuration using the AT+CPSMS command Enable module connected mode for a given time period and then disable it for a time period long enough to adequately mitigate the temperature increase. UBX-16029218 - R11 Design-in Page 86 of 116 SARA-R4/N4 series - System Integration Manual 2.13 Schematic for SARA-R4/N4 series module integration 2.13.1 Schematic for SARA-R4/N4 series modules Figure 55 is an example of a schematic diagram where a SARA-R4/N4 series “00”, “01” or “x2” product version is integrated into an application board using all available module interfaces and functions. SARA-R4/N4 15pF 3V8 100uF 100nF 10nF 68pF 51 VCC 52 VCC 53 VCC 15pF ANT 39nH GND ANT_DE T 27pF TP TP Open drain output USB 2.0 host D+ ESD SIM Card Holder V_INT Open drain output D- 68nH 10k 62 Application Processor VBUS External antenna Connector 33pF 56 0Ω TP 0Ω TP 0Ω TP 15 18 PWR_ON TP 1k V_INT 4 GPIO5 42 SW1 SW2 VSIM 41 CCVCC (C1) SIM_IO 39 CCIO (C7) SIM_CLK 38 CCCLK (C3) SIM_RST 40 CCRST (C2) CCVPP (C6) RESET_N GND (C5) 470k 47pF 47pF47pF 47pF 100nF ESD ESD ESD ESD ESD ESD 17 VUSB_DET 28 USB_D- 29 USB_D+ GND GND u-blox GNSS 3.0 V receiver Not supported by ‘00’ and ‘01’ product version LDO Regulator 3V8 GPIO2 23 IN OUT SHDNn GND 3V0 VCC 100nF 47k 1.8 V DTE TXD RXD 0Ω TP 0Ω TP RTS 12 TXD 13 RXD 10 RTS CTS 11 CTS DTR 9 DTR SCL DSR 6 DSR RI 7 RI DCD 8 DCD Network Indicator 4.7k 4.7k SDA_A SDA_B SDA2 27 SCL_A GND SCL_B SCL2 SN74AVC2T245 V_INT Voltage Translator 100nF VCCB VCCA DIR1 3V0 100nF GPIO3 24 B1 A1 TxD1 GPIO4 25 B2 A2 EXTINT0 OEn 3V8 100nF OE 26 GND RSVD VCCB VCCA 100nF SDA GND TCA9406 I2C Voltage Translator V_INT 44 SDIO_D2 45 SDIO_CLK 46 SDIO_CMD 47 SDIO_D0 I2S_RXD / SPI_MISO 37 48 SDIO_D3 I2S_CLK / SPI_CLK 36 49 SDIO_D1 I2S_WA / SPI_MOSI 34 16 GPIO1 GPIO6 19 I2S_TXD / SPI_CS 35 GND DIR2 GND Figure 55: Example of schematic diagram to integrate a SARA-R4/N4 series module using all available interfaces20 20 Flow control is not supported by ‘00’, ‘01’ and SARA-R410M-02B product versions, but the RTS input must be set low to use the UART on ‘00’ and ‘01’ versions. The DTR input must be set low to have URCs presented over UART on ‘00’, ‘01’ and ‘x2’ product versions. UBX-16029218 - R11 Design-in Page 87 of 116 SARA-R4/N4 series - System Integration Manual 2.14 Design-in checklist This section provides a design-in checklist. 2.14.1 Schematic checklist The following are the most important points for a simple schematic check: DC supply must provide a nominal voltage at VCC pin within the operating range limits. VCC voltage supply should be clean, with very low ripple/noise: provide the suggested bypass capacitors, in particular if the application device integrates an internal antenna. Do not apply loads which might exceed the limit for maximum available current from V_INT supply. Check that voltage level of any connected pin does not exceed the relative operating range. Capacitance and series resistance must be limited on each SIM signal to match the SIM specifications. Insert the suggested pF capacitors on each SIM signal and low capacitance ESD protections if accessible. Check UART signals direction, as the modules’ signal names follow the ITU-T V.24 Recommendation [5]. Capacitance and series resistance must be limited on each high speed line of the USB interface. It is strongly recommended to provide accessible test points directly connected to the USB interface pins (VUSB_DET, USB_D+ and USB_D- pins). Use transistors with at least an integrated resistor in the base pin or otherwise put a 10 k resistor on the board in series to the GPIO when those are used to drive LEDs. Provide adequate precautions for EMC / ESD immunity as required on the application board. All unused pins can be left unconnected. DC supply must be capable of supporting the highest peak / pulse current consumption values and the maximum averaged current consumption values in connected mode, as specified in the SARA-R4/N4 series Data Sheet [1]. Provide accessible test points directly connected to the following pins of the SARA-R4/N4 series modules: V_INT, PWR_ON and RESET_N for diagnostic purposes. Do not apply voltage to any generic digital interface pin of SARA-R4/N4 series modules before the switch-on of the generic digital interface supply source (V_INT). 2.14.2 Layout checklist The following are the most important points for a simple layout check: Check 50 nominal characteristic impedance of the RF transmission line connected to the ANT port (antenna RF interface). Ensure no coupling occurs between the RF interface and noisy or sensitive signals (SIM signals, high-speed digital lines such as USB, and other data lines). Optimize placement for minimum length of RF line. VCC line should be enough wide and as short as possible. Check the footprint and paste mask designed for SARA-R4/N4 series module as illustrated in section 2.11. Route VCC supply line away from RF line / part (refer to Figure 28) and other sensitive analog lines / parts. UBX-16029218 - R11 Design-in Page 88 of 116 SARA-R4/N4 series - System Integration Manual The VCC bypass capacitors in the picoFarad range should be placed as close as possible to the VCC pins, in particular if the application device integrates an internal antenna. Ensure an optimal grounding connecting each GND pin with application board solid ground layer. Use as many vias as possible to connect the ground planes on multilayer application board, providing a dense line of vias at the edges of each ground area, in particular along RF and high speed lines. Keep routing short and minimize parasitic capacitance on the SIM lines to preserve signal integrity. USB_D+ / USB_D- traces should meet the characteristic impedance requirement (90 differential and 30 common mode) and should not be routed close to any RF line / part. 2.14.3 Antenna checklist Antenna termination should provide 50 characteristic impedance with V.S.W.R at least less than 3:1 (recommended 2:1) on operating bands in deployment geographical area. Follow the recommendations of the antenna producer for correct antenna installation and deployment (PCB layout and matching circuitry). Ensure compliance with any regulatory agency RF radiation requirement, as reported in section 4.2.2 for United States and in section 4.3.1 for Canada. Ensure high isolation between the cellular antenna and any other antennas or transmitters present on the end device. UBX-16029218 - R11 Design-in Page 89 of 116 SARA-R4/N4 series - System Integration Manual 3 ☞ Handling and soldering No natural rubbers, no hygroscopic materials or materials containing asbestos are employed. 3.1 Packaging, shipping, storage and moisture preconditioning For information pertaining to SARA-R4/N4 series reels / tapes, Moisture Sensitivity levels (MSD), shipment and storage information, as well as drying for preconditioning, see the SARA-R4/N4 series Data Sheet [1] and the u-blox Package Information Guide [15]. 3.2 Handling The SARA-R4/N4 series modules are Electro-Static Discharge (ESD) sensitive devices. ⚠ Ensure ESD precautions are implemented during handling of the module. Electrostatic discharge (ESD) is the sudden and momentary electric current that flows between two objects at different electrical potentials caused by direct contact or induced by an electrostatic field. The term is usually used in the electronics and other industries to describe momentary unwanted currents that may cause damage to electronic equipment. The ESD sensitivity for each pin of SARA-R4/N4 series modules (as Human Body Model according to JESD22-A114F) is specified in the SARA-R4/N4 series Data Sheet [1]. ESD prevention is based on establishing an Electrostatic Protective Area (EPA). The EPA can be a small working station or a large manufacturing area. The main principle of an EPA is that there are no highly charging materials near ESD sensitive electronics, all conductive materials are grounded, workers are grounded, and charge build-up on ESD sensitive electronics is prevented. International standards are used to define typical EPA and can be obtained for example from the International Electrotechnical Commission (IEC) or the American National Standards Institute (ANSI). In addition to standard ESD safety practices, the following measures should be taken into account whenever handling the SARA-R4/N4 series modules: Unless there is a galvanic coupling between the local GND (i.e. the work table) and the PCB GND, then the first point of contact when handling the PCB must always be between the local GND and PCB GND. Before mounting an antenna patch, connect the ground of the device. When handling the module, do not come into contact with any charged capacitors and be careful when contacting materials that can develop charges (e.g. patch antenna, coax cable, soldering iron). To prevent electrostatic discharge through the RF pin, do not touch any exposed antenna area. If there is any risk that such exposed antenna area is touched in a non-ESD protected work area, implement adequate ESD protection measures in the design. When soldering the module and patch antennas to the RF pin, make sure to use an ESD-safe soldering iron. UBX-16029218 - R11 Handling and soldering Page 90 of 116 SARA-R4/N4 series - System Integration Manual 3.3 Soldering 3.3.1 Soldering paste "No Clean" soldering paste is strongly recommended for SARA-R4/N4 series modules, as it does not require cleaning after the soldering process has taken place. The paste listed in the example below meets these criteria. Soldering Paste: OM338 SAC405 / Nr.143714 (Cookson Electronics) Alloy specification: 95.5% Sn / 3.9% Ag / 0.6% Cu (95.5% Tin / 3.9% Silver / 0.6% Copper) 95.5% Sn / 4.0% Ag / 0.5% Cu (95.5% Tin / 4.0% Silver / 0.5% Copper) Melting Temperature: 217 °C Stencil Thickness: 150 µm for base boards The final choice of the soldering paste depends on the approved manufacturing procedures. The paste-mask geometry for applying soldering paste should meet the recommendations in section 2.11. ☞ The quality of the solder joints should meet the appropriate IPC specification. 3.3.2 Reflow soldering A convection type-soldering oven is strongly recommended for SARA-R4/N4 series modules over the infrared type radiation oven. Convection heated ovens allow precise control of the temperature and all parts will be heated up evenly, regardless of material properties, thickness of components and surface color. Consider the ”IPC-7530A Guidelines for temperature profiling for mass soldering (reflow and wave) processes”. Reflow profiles are to be selected according to the following recommendations. ⚠ Failure to observe these recommendations can result in severe damage to the device! Preheat phase Initial heating of component leads and balls. Residual humidity will be dried out. Note that this preheat phase will not replace prior baking procedures. Temperature rise rate: max 3 °C/s Time: 60 – 120 s End Temperature: +150 - +200 °C If the temperature rise is too rapid in the preheat phase it may cause excessive slumping. If the preheat is insufficient, rather large solder balls tend to be generated. Conversely, if performed excessively, fine balls and large balls will be generated in clusters. If the temperature is too low, non-melting tends to be caused in areas containing large heat capacity. Heating/ reflow phase The temperature rises above the liquidus temperature of +217 °C. Avoid a sudden rise in temperature as the slump of the paste could become worse. Limit time above +217 °C liquidus temperature: 40 - 60 s Peak reflow temperature: +245 °C UBX-16029218 - R11 Handling and soldering Page 91 of 116 SARA-R4/N4 series - System Integration Manual Cooling phase A controlled cooling avoids negative metallurgical effects (solder becomes more brittle) of the solder and possible mechanical tensions in the products. Controlled cooling helps to achieve bright solder fillets with a good shape and low contact angle. Temperature fall rate: max 4 °C/s ☞ To avoid falling off, modules should be placed on the topside of the motherboard during soldering. The soldering temperature profile chosen at the factory depends on additional external factors like choice of soldering paste, size, thickness and properties of the base board, etc. ⚠ Exceeding the maximum soldering temperature and the maximum liquidus time limit in the recommended soldering profile may permanently damage the module. Preheat [°C] 250 Heating Peak Temp. 245°C Cooling [°C] 250 Liquidus Temperature 217 200 217 200 40 - 60 s End Temp. 150 - 200°C max 4°C/s 150 150 max 3°C/s 60 - 120 s Typical Leadfree Soldering Profile 100 50 100 50 Elapsed time [s] Figure 56: Recommended soldering profile ☞ The modules must not be soldered with a damp heat process. 3.3.3 Optical inspection After soldering the module, inspect it optically to verify that it is correctly aligned and centered. 3.3.4 Cleaning Cleaning the modules is not recommended. Residues underneath the modules cannot be easily removed with a washing process. Cleaning with water will lead to capillary effects where water is absorbed in the gap between the baseboard and the module. The combination of residues of soldering flux and encapsulated water leads to short circuits or resistor-like interconnections between neighboring pads. Water will also damage the sticker and the ink-jet printed text. Cleaning with alcohol or other organic solvents can result in soldering flux residues flooding into the two housings, areas that are not accessible for post-wash inspections. The solvent will also damage the sticker and the ink-jet printed text. Ultrasonic cleaning will permanently damage the module, in particular the quartz oscillators. For best results, use a "no clean" soldering paste and eliminate the cleaning step after the soldering. UBX-16029218 - R11 Handling and soldering Page 92 of 116 SARA-R4/N4 series - System Integration Manual 3.3.5 Repeated reflow soldering Repeated reflow soldering processes and soldering the module upside-down are not recommended. Boards with components on both sides may require two reflow cycles. In this case, the module should always be placed on the side of the board that is submitted into the last reflow cycle. The reason for this (besides others) is the risk of the module falling off due to the significantly higher weight in relation to other components. ☞ u-blox gives no warranty against damages to the SARA-R4/N4 series modules caused by performing more than a total of two reflow soldering processes (one reflow soldering process to mount the SARA-R4/N4 series module, plus one reflow soldering process to mount other parts). 3.3.6 Wave soldering SARA-R4/N4 series LGA modules must not be soldered with a wave soldering process. Boards with combined through-hole technology (THT) components and surface-mount technology (SMT) devices require wave soldering to solder the THT components. No more than one wave soldering process is allowed for a board with a SARA-R4/N4 series module already populated on it. ⚠ Performing a wave soldering process on the module can result in severe damage to the device! ☞ u-blox gives no warranty against damages to the SARA-R4/N4 series modules caused by performing more than a total of two soldering processes (one reflow soldering process to mount the SARA-R4/N4 series module, plus one wave soldering process to mount other THT parts on the application board). 3.3.7 Hand soldering Hand soldering is not recommended. 3.3.8 Rework Rework is not recommended. ☞ Never attempt a rework on the module itself, e.g. replacing individual components. Such actions immediately terminate the warranty. 3.3.9 Conformal coating Certain applications employ a conformal coating of the PCB using HumiSeal® or other related coating products. These materials affect the HF properties of the cellular modules and it is important to prevent them from flowing into the module. The RF shields do not provide 100% protection for the module from coating liquids with low viscosity, therefore care is required in applying the coating. ☞ Conformal Coating of the module will void the warranty. 3.3.10 Casting If casting is required, use viscose or another type of silicon pottant. The OEM is strongly advised to qualify such processes in combination with the cellular modules before implementing this in production. ☞ Casting will void the warranty. UBX-16029218 - R11 Handling and soldering Page 93 of 116 SARA-R4/N4 series - System Integration Manual 3.3.11 Grounding metal covers Attempts to improve grounding by soldering ground cables, wick or other forms of metal strips directly onto the EMI covers is done at the customer's own risk. The numerous ground pins should be sufficient to provide optimum immunity to interference and noise. ☞ u-blox gives no warranty for damages to the cellular modules caused by soldering metal cables or any other forms of metal strips directly onto the EMI covers. 3.3.12 Use of ultrasonic processes The cellular modules contain components which are sensitive to ultrasonic waves. Use of any ultrasonic processes (cleaning, welding etc.) may cause damage to the module. ☞ u-blox gives no warranty against damages to the cellular modules caused by any ultrasonic processes. UBX-16029218 - R11 Handling and soldering Page 94 of 116 SARA-R4/N4 series - System Integration Manual 4 Approvals 4.1 Product certification approval overview Product certification approval is the process of certifying that a product has passed all tests and criteria required by specifications, typically called “certification schemes”, that can be divided into: Regulatory certifications o Country-specific approval required by local government in most regions and countries, as: CE (Conformité Européenne) marking for European Union FCC (Federal Communications Commission) approval for the United States Industry certifications o Telecom industry-specific approval verifying interoperability between devices and networks: GCF (Global Certification Forum) PTCRB (PCS Type Certification Review Board) Operator certifications o Operator-specific approvals required by some mobile network operator, such as: AT&T network operator in United States Verizon Wireless network operator in United States SARA-R4/N4 series modules’ approvals are summarized in Table 38. Certification SARA-R404M PTCRB SARA-R410M-01B SARA-R410M-02B SARA-R410M-52B SARA-R412M-02B LTE Cat M1 Bands 2, 4, 5, 12 LTE Cat M1, NB1 Bands 2, 3, 4, 5, 8, 12, 13, 20, 28 LTE Cat M1 Bands 2, 4, 5, 12, 13 LTE Cat M1, NB1 Bands LTE Cat NB1 Bands 2, 4, 5, 12, 13 2, 4, 5, 12 2G Bands 850, 900, 1800, 1900 CE Europe LTE Cat M1, NB1 Bands 3, 8, 20 SARA-N410-02B LTE Cat M1, NB1 Bands 3, 8, 20 2G Bands 900, 1800 FCC US LTE Cat M1 Band 13 LTE Cat M1 Bands 2, 4, 5, 12 LTE Cat M1, NB1 Bands 2, 4, 5, 12, 13 LTE Cat M1 Bands 2, 4, 5, 12, 13 LTE Cat M1, NB1 Bands LTE Cat NB1 Bands 2, 4, 5, 12, 13 2, 4, 5, 12, 13 2G Bands 850, 1900 FCC ID XPY2AGQN1NNN XPY2AGQN4NNN XPY2AGQN4NNN XPY2AGQN4NNN XPYUBX18ZO01 ISED Canada LTE Cat M1 Bands 2, 4, 5, 12 LTE Cat M1, NB1 Bands 2, 4, 5, 12, 13 LTE Cat M1 Bands 2, 4, 5, 12, 13 LTE Cat M1, NB1 Bands LTE Cat NB1 Bands 2, 4, 5, 12, 13 2, 4, 5, 12, 13 2G Bands 850, 1900 ISED ID 8595A-2AGQN4NNN 8595A-2AGQN4NNN 8595A-2AGQN4NNN 8595A-UBX18ZO01 IFT Mexico M1 Bands 2, 4, 5, 12 RCM Australia LTE Cat M1 Bands 3, 5, 8, 28 NCC Taiwan LTE Cat M1, NB1 Bands 3, 8, 28 Verizon LTE Cat M1 Band 13 AT&T 8595A-2AGQN4NNN LTE Cat NB1 Bands 3, 8, 28 LTE Cat M1 Bands 4, 13 LTE Cat M1 Bands 2, 4, 5, 12 LTE Cat M1 Bands 2, 4, 5, 12 T-Mobile LTE Cat M1 Bands 2, 4, 5, 12 LTE Cat M1 Bands 2, 4, 5, 12 LTE Cat NB1 Bands 2, 4, 5, 12 Bell LTE Cat M1 Bands 2, 4, 5, 12 Telus LTE Cat M1 Bands 2, 4, 5, 12 Telstra XPY2AGQN4NNN LTE Cat M1 Bands 2, 4, 5, 12 LTE Cat M1 Bands 3, 5, 8, 28 Table 38: Summary of certification approvals achieved for the SARA-R4/N4 series modules, with related RAT and bands ☞ For the complete list and specific details regarding the certification approvals available for all the different SARA-R4/N4 series modules’ ordering numbers, including certificates of compliancy, please contact the u-blox office or sales representative nearest you. UBX-16029218 - R11 Approvals Page 95 of 116 SARA-R4/N4 series - System Integration Manual The manufacturer of the end-device that integrates a SARA-R4/N4 series module must take care of all certification approvals required by the specific integrating device to be deployed in the market. The required certification scheme approvals and relative testing specifications applicable to the end-device that integrates a SARA-R4/N4 series module differ depending on the country or the region where the integrating device is intended to be deployed, on the relative vertical market of the device, on type, features and functionalities of the whole application device, and on the network operators where the device is intended to operate. The SARA-R4/N4 series modules from “02” product versions onwards include the capability to configure the device by selecting the operating Mobile Network Operator Profile, Radio Access Technology, and bands. In the SARA-R4/N4 series AT Commands Manual [2], see the +UMNOPROF, +URAT, and +UBANDMASK AT commands. As these configuration decisions are made, u-blox reminds manufacturers of the end-device integrating the “02” product versions onwards of SARA-R4/N4 series modules to take care of compliance with all the certification approvals requirements applicable to the specific integrating device to be deployed in the market. ☞ Check the appropriate applicability of the SARA-R4/N4 series module’s approvals while starting the certification process of the device integrating the module: the re-use of the u-blox cellular module’s approval can significantly reduce the cost and time to market of the application device certification. ☞ The certification of the application device that integrates a SARA-R4/N4 series module and the compliance of the application device with all the applicable certification schemes, directives and standards are the sole responsibility of the application device manufacturer. SARA-R4/N4 series modules are certified according to all capabilities and options stated in the Protocol Implementation Conformance Statement document (PICS) of the module. The PICS, according to the 3GPP TS 36.521-2 [12] and 3GPP TS 36.523-2 [13], is a statement of the implemented and supported capabilities and options of a device. ☞ The PICS document of the application device integrating SARA-R4/N4 series modules must be updated from the module PICS statement if any feature stated as supported by the module in its PICS document is not implemented or disabled in the application device. For more details regarding the AT commands settings that affect the PICS, see the SARA-R4/N4 series AT Commands Manual [1]. ☞ Check the specific settings required for mobile network operators approvals as they may differ from the AT commands settings defined in the module as integrated in the application device. UBX-16029218 - R11 Approvals Page 96 of 116 SARA-R4/N4 series - System Integration Manual 4.2 US Federal Communications Commission notice United States Federal Communications Commission (FCC) IDs: u-blox SARA-R404M cellular modules: XPY2AGQN1NNN u-blox SARA-R410M and SARA-N410 cellular modules: XPY2AGQN4NNN u-blox SARA-R412M cellular modules: XPYUBX18ZO01 4.2.1 Safety warnings review the structure Equipment for building-in. The requirements for fire enclosure must be evaluated in the end product The clearance and creepage current distances required by the end product must be withheld when the module is installed The cooling of the end product shall not negatively be influenced by the installation of the module Excessive sound pressure from earphones and headphones can cause hearing loss No natural rubbers, hygroscopic materials, or materials containing asbestos are employed 4.2.2 Declaration of Conformity This device complies with Part 15 of the FCC rules. Operation is subject to the following two conditions: this device may not cause harmful interference this device must accept any interference received, including interference that may cause undesired operation ⚠ Radiofrequency radiation exposure information: this equipment complies with the radiation exposure limits prescribed for an uncontrolled environment for fixed and mobile use conditions. This equipment should be installed and operated with a minimum distance of 20 cm between the radiator and the body of the user or nearby persons. This transmitter must not be co-located or operating in conjunction with any other antenna or transmitter except as authorized in the certification of the product. ⚠ The gain of the system antenna(s) used for the SARA-R4/N4 series modules (i.e. the combined transmission line, connector, cable losses and radiating element gain) must not exceed the value specified in the FCC Grant for mobile and fixed or mobile operating configurations: SARA-R404M modules: o 13 dBi in 750 MHz, i.e. LTE FDD-13 band SARA-R410M-01B modules: o 3.67 dBi in 700 MHz, i.e. LTE FDD-12 band o 4.10 dBi in 850 MHz, i.e. LTE FDD-5 band o 6.74 dBi in 1700 MHz, i.e. LTE FDD-4 band o 7.12 dBi in 1900 MHz, i.e. LTE FDD-2 band SARA-R410M-02B, SARA-R410M-52B and SARA-N410-02B modules: o 3.66 dBi in 700 MHz, i.e. LTE FDD-12 band o 3.94 dBi in 750 MHz, i.e. LTE FDD-13 band o 4.41 dBi in 850 MHz, i.e. LTE FDD-5 band o 6.75 dBi in 1700 MHz, i.e. LTE FDD-4 band o 7.00 dBi in 1900 MHz, i.e. LTE FDD-2 band SARA-R412M-02B modules: o 8.69 dBi in 700 MHz, i.e. LTE FDD-12 band o 9.15 dBi in 750 MHz, i.e. LTE FDD-13 band o 9.41 dBi in 850 MHz, i.e. GSM 850 / LTE FDD-5 band o 12.01 dBi in 1700 MHz, i.e. LTE FDD-4 band o 12.01 dBi in 1900 MHz, i.e. GSM 1900 / LTE FDD-2 band UBX-16029218 - R11 Approvals Page 97 of 116 SARA-R4/N4 series - System Integration Manual 4.2.3 Modifications The FCC requires the user to be notified that any changes or modifications made to this device that are not expressly approved by u-blox could void the user's authority to operate the equipment. ⚠ Manufacturers of mobile or fixed devices incorporating the SARA-R4/N4 series modules are authorized to use the FCC Grants of the SARA-R4/N4 series modules for their own final products according to the conditions referenced in the certificates. ⚠ The FCC Label shall in the above case be visible from the outside, or the host device shall bear a second label stating: o o o For SARA-R404M modules: For SARA-R410M and SARA-N410 modules: For SARA-R412M cellular modules: "Contains FCC ID: XPY2AGQN1NNN" "Contains FCC ID: XPY2AGQN4NNN" "Contains FCC ID: XPYUBX18ZO01" ⚠ IMPORTANT: Manufacturers of portable applications incorporating the SARA-R4/N4 series modules are required to have their final product certified and apply for their own FCC Grant related to the specific portable device. This is mandatory to meet the SAR requirements for portable devices. Changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment. ⚠ Additional Note: as per 47CFR15.105 this equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures: o o o o Reorient or relocate the receiving antenna Increase the separation between the equipment and receiver Connect the equipment into an outlet on a circuit different from that to which the receiver is connected Consultant the dealer or an experienced radio/TV technician for help 4.3 Innovation, Science, Economic Development Canada notice ISED Canada (formerly known as IC - Industry Canada) Certification Numbers: u-blox SARA-R410M and SARA-N410 cellular modules: 8595A-2AGQN4NNN u-blox SARA-R412M cellular modules: 8595A-UBX18ZO01 4.3.1 Declaration of Conformity This device complies with the ISED Canada license-exempt RSS standard(s). Operation is subject to the following two conditions: this device may not cause harmful interference this device must accept any interference received, including interference that may cause undesired operation UBX-16029218 - R11 Approvals Page 98 of 116 SARA-R4/N4 series - System Integration Manual ⚠ Radiofrequency radiation exposure information: this equipment complies with the radiation exposure limits prescribed for an uncontrolled environment for fixed and mobile use conditions. This equipment should be installed and operated with a minimum distance of 20 cm between the radiator and the body of the user or nearby persons. This transmitter must not be co-located or operating in conjunction with any other antenna or transmitter except as authorized in the certification of the product. ⚠ The gain of the system antenna(s) used for the SARA-R4/N4 series modules (i.e. the combined transmission line, connector, cable losses and radiating element gain) must not exceed the value stated in the ISED Canada Grant for mobile and fixed or mobile operating configurations: SARA-R410M-01B modules: o 3.67 dBi in 700 MHz, i.e. LTE FDD-12 band o 4.10 dBi in 850 MHz, i.e. LTE FDD-5 band o 6.74 dBi in 1700 MHz, i.e. LTE FDD-4 band o 7.12 dBi in 1900 MHz, i.e. LTE FDD-2 band SARA-R410M-02B, SARA-R410M-52B and SARA-N410-02B modules: o 3.66 dBi in 700 MHz, i.e. LTE FDD-12 band o 3.94 dBi in 750 MHz, i.e. LTE FDD-13 band o 4.41 dBi in 850 MHz, i.e. LTE FDD-5 band o 6.75 dBi in 1700 MHz, i.e. LTE FDD-4 band o 7.00 dBi in 1900 MHz, i.e. LTE FDD-2 band SARA-R412M-02B modules: o 5.63 dBi in 700 MHz, i.e. LTE FDD-12 band o 5.94 dBi in 750 MHz, i.e. LTE FDD-13 band o 6.12 dBi in 850 MHz, i.e. GSM 850 / LTE FDD-5 band o 8.29 dBi in 1700 MHz, i.e. LTE FDD-4 band o 8.52 dBi in 1900 MHz, i.e. GSM 1900 / LTE FDD-2 band 4.3.2 Modifications ISED Canada requires the user to be notified that any changes or modifications made to this device that are not expressly approved by u-blox could void the user's authority to operate the equipment. ⚠ Manufacturers of mobile or fixed devices incorporating the SARA-R4/N4 series modules are authorized to use the ISED Canada Certificates of the SARA-R4/N4 series modules for their own final products according to the conditions referenced in the certificates. ⚠ The ISED Canada Label shall in the above case be visible from the outside, or the host device shall bear a second label stating: o o ⚠ For SARA-R410M and SARA-N410 modules: For SARA-R412M cellular modules: "Contains IC: 8595A-2AGQN4NNN" "Contains IC: 8595A-UBX18ZO01" Innovation, Science and Economic Development Canada (ISED) Notices This Class B digital apparatus complies with Canadian CAN ICES-3(B) / NMB-3(B). Operation is subject to the following two conditions: this device may not cause interference this device must accept any interference, including interference that may cause undesired operation of the device UBX-16029218 - R11 Approvals Page 99 of 116 SARA-R4/N4 series - System Integration Manual Radio Frequency (RF) Exposure Information The radiated output power of the u-blox Cellular Module is below the Innovation, Science and Economic Development Canada (ISED) radio frequency exposure limits. The u-blox Cellular Module should be used in a manner such that the potential for human contact during normal operation is minimized. This device has been evaluated and shown compliant with the IC RF Exposure limits under mobile exposure conditions (antennas are greater than 20 cm from a person's body). This device has been certified for use in Canada. Status of the listing in the Industry Canada’s REL (Radio Equipment List) can be found at the following web address: http://www.ic.gc.ca/app/sitt/reltel/srch/nwRdSrch.do?lang=eng Additional Canadian information on RF exposure also can be found at the following web address: http://www.ic.gc.ca/eic/site/smt-gst.nsf/eng/sf08792.html ⚠ IMPORTANT: Manufacturers of portable applications incorporating the SARA-R4/N4 series modules are required to have their final product certified and apply for their own Industry Canada Certificate related to the specific portable device. This is mandatory to meet the SAR requirements for portable devices. Changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment. ⚠ Avis d'Innovation, Sciences et Développement économique Canada (ISDE) Cet appareil numérique de classe B est conforme aux normes canadiennes CAN ICES-3(B) / NMB-3(B). Son fonctionnement est soumis aux deux conditions suivantes: o cet appareil ne doit pas causer d'interférence o cet appareil doit accepter toute interférence, notamment les interférences qui peuvent affecter son fonctionnement Informations concernant l'exposition aux fréquences radio (RF) La puissance de sortie émise par l’appareil de sans-fil u-blox Cellular Module est inférieure à la limite d'exposition aux fréquences radio d'Innovation, Sciences et Développement économique Canada (ISDE). Utilisez l’appareil de sans-fil u-blox Cellular Module de façon à minimiser les contacts humains lors du fonctionnement normal. Ce périphérique a été évalué et démontré conforme aux limites d'exposition aux fréquences radio (RF) d'IC lorsqu'il est installé dans des produits hôtes particuliers qui fonctionnent dans des conditions d'exposition à des appareils mobiles (les antennes se situent à plus de 20 centimètres du corps d'une personne). Ce périphérique est homologué pour l'utilisation au Canada. Pour consulter l'entrée correspondant à l’appareil dans la liste d'équipement radio (REL - Radio Equipment List) d'Industrie Canada rendez-vous sur: http://www.ic.gc.ca/app/sitt/reltel/srch/nwRdSrch.do?lang=fra Pour des informations supplémentaires concernant l'exposition aux RF au Canada rendez-vous sur: http://www.ic.gc.ca/eic/site/smt-gst.nsf/fra/sf08792.html ⚠ IMPORTANT: les fabricants d'applications portables contenant les modules de la SARA-R4/N4 series doivent faire certifier leur produit final et déposer directement leur candidature pour une certification FCC ainsi que pour un certificat ISDE Canada délivré par l'organisme chargé de ce type d'appareil portable. Ceci est obligatoire afin d'être en accord avec les exigences SAR pour les appareils portables. Tout changement ou modification non expressément approuvé par la partie responsable de la certification peut annuler le droit d'utiliser l'équipement. UBX-16029218 - R11 Approvals Page 100 of 116 SARA-R4/N4 series - System Integration Manual 4.4 European Conformance CE mark SARA-R410M-02B and SARA-R412M-02B module product versions have been evaluated against the essential requirements of the Radio Equipment Directive 2014/53/EU. In order to satisfy the essential requirements of the 2014/53/EU RED, the modules are compliant with the following standards: Radio Spectrum Efficiency (Article 3.2): o EN 301 908-1 o EN 301 908-13 o EN 301 511 Electromagnetic Compatibility (Article 3.1b): o EN 301 489-1 o EN 301 489-52 Health and Safety (Article 3.1a) o EN 62368-1 o EN 62311 ⚠ Radiofrequency radiation exposure Information: this equipment complies with radiation exposure limits prescribed for an uncontrolled environment for fixed and mobile use conditions. This equipment should be installed and operated with a minimum distance of 20 cm between the radiator and the body of the user or nearby persons. This transmitter must not be co-located or operating in conjunction with any other antenna or transmitter except as authorized in the certification of the product. ⚠ The gain of the system antenna(s) used for the SARA-R410M-02B and SARA-R412M-02B modules (i.e. the combined transmission line, connector, cable losses and radiating element gain) must not exceed the values stated in the Declaration of Conformity of the modules, for mobile and fixed or mobile operating configurations: SARA-R410M-02B modules: o 8.2 dBi in 800 MHz, i.e. LTE FDD-20 band o 8.4 dBi in 900 MHz, i.e. LTE FDD-8 band o 11.3 dBi in 1800 MHz, i.e. LTE FDD-3 band SARA-R412M-02B modules: o 8.2 dBi in 800 MHz, i.e. LTE FDD-20 band o 3.21 dBi in 900 MHz, i.e. GSM 900 / LTE FDD-8 band o 9.09 dBi in 1800 MHz, i.e. GSM 1800 / LTE FDD-3 band The conformity assessment procedure for the SARA-R410M-02B and SARA-R412M-02B modules, referred to in Article 17 and detailed in Annex II of Directive 2014/53/EU, has been followed. Thus, the following marking is included in the product: 4.5 Taiwanese National Communication Commission The SARA-R410M-02B product version has the applicable regulatory approval for Taiwan (NCC) SARA-R410M-02B modules NCC ID: CCAA18NB0010T3 CCAA18NB0010T3 UBX-16029218 - R11 Approvals Page 101 of 116 SARA-R4/N4 series - System Integration Manual 5 Product testing 5.1 u-blox in-series production test u-blox focuses on high quality for its products. All units produced are fully tested automatically on the production line. Stringent quality control processes have been implemented in the production line. Defective units are analyzed in detail to improve production quality. This is achieved with automatic test equipment (ATE) in the production line, which logs all production and measurement data. A detailed test report for each unit can be generated from the system. Figure 57 illustrates the typical automatic test equipment (ATE) in a production line. The following typical tests are among the production tests. Digital self-test (firmware download, flash firmware verification, IMEI programming) Measurement of voltages and currents Adjustment of ADC measurement interfaces Functional tests (serial interface communication, SIM card communication) Digital tests (GPIOs and other interfaces) Measurement and calibration of RF characteristics in all supported bands (such as receiver S/N verification, frequency tuning of the reference clock, calibration of transmitter and receiver power levels, etc.) Verification of the RF characteristics after calibration (i.e. modulation accuracy, power levels, spectrum, etc. are checked to ensure they are all within tolerances when calibration parameters are applied) Figure 57: Automatic test equipment for module tests UBX-16029218 - R11 Product testing Page 102 of 116 SARA-R4/N4 series - System Integration Manual 5.2 Test parameters for OEM manufacturers Because of the testing done by u-blox (with 100% coverage), an OEM manufacturer does not need to repeat the firmware tests or measurements of the module RF performance or tests over analog and digital interfaces in their production test. However, an OEM manufacturer should focus on: Module assembly on the device; it should be verified that: o The soldering and handling process did not damage the module components o All module pins are well soldered on the device board o There are no short circuits between pins Component assembly on the device; it should be verified that: o Communication with the host controller can be established o The interfaces between the module and device are working o Overall RF performance test of the device including the antenna Dedicated tests can be implemented to check the device. For example, the measurement of the module current consumption when set in a specified status can detect a short circuit if compared with a “Golden Device” result. In addition, module AT commands can be used to perform functional tests on the digital interfaces (communication with the host controller, check the SIM interface, GPIOs, etc.) or to perform RF performance tests (see the following section 5.2.2 for details). 5.2.1 “Go/No go” tests for integrated devices A “Go/No go” test is typically used to compare the signal quality with a “Golden Device” in a location with excellent network coverage and known signal quality. This test should be performed after the data connection has been established. AT+CSQ is the typical AT command used to check signal quality in term of RSSI. See the SARA-R4/N4 series AT Commands Manual [2] for detail usage of the AT command. ☞ These kinds of test may be useful as a “go/no go” test but not for RF performance measurements. This test is suitable to check the functionality of communications with the host controller, the SIM card and the power supply. It is also a means to verify if components at the antenna interface are wellsoldered. 5.2.2 RF functional tests The overall RF functional test of the device including the antenna can be performed with basic instruments such as a spectrum analyzer (or an RF power meter) and a signal generator with the assistance of the AT+UTEST command over the AT command user interface. The AT+UTEST command provides a simple interface to set the module to Rx or Tx test modes ignoring the LTE signaling protocol. The command can set the module into: ☞ transmitting mode in a specified channel and power level in all supported bands receiving mode in a specified channel to return the measured power level in all supported bands See the SARA-R4/N4 series AT Commands Manual [2] for the AT+UTEST command syntax description and detail guide of usage. UBX-16029218 - R11 Product testing Page 103 of 116 SARA-R4/N4 series - System Integration Manual This feature allows the measurement of the transmitter and receiver power levels to check the component assembly related to the module antenna interface and to check other device interfaces on which the RF performance depends. ⚠ To avoid module damage during a transmitter test, a suitable antenna according to module specifications or a 50 termination must be connected to the ANT port. ⚠ To avoid module damage during a receiver test, the maximum power level received at the ANT port must meet module specifications. ☞ The AT+UTEST command sets the module to emit RF power ignoring LTE signaling protocol. This emission can generate interference that can be prohibited by law in some countries. The use of this feature is intended for testing purposes in controlled environments by qualified users and must not be used during the normal module operation. Follow the instructions suggested in the u-blox documentation. u-blox assumes no responsibilities for the inappropriate use of this feature. Figure 58 illustrates a typical test setup for such an RF functional test. Application Processor SARA-R4/N4 AT commands Cellular antenna ANT Wideband antenna TX IN Spectrum Analyzer or Power Meter OUT Signal Generator Application Board Application Processor SARA-R4/N4 AT commands ANT Cellular antenna Wideband antenna RX Application Board Figure 58: Setup with spectrum analyzer or power meter and signal generator for SARA-R4/N4 series RF measurements UBX-16029218 - R11 Product testing Page 104 of 116 SARA-R4/N4 series - System Integration Manual Appendix A Migration between SARA modules A.1 Overview 47 MIC_GND RI 7 46 MIC_BIAS DCD 8 45 SPK_N DTR 9 RTS 10 44 SPK_P RTS 10 CTS 11 43 GND CTS 11 TXD 12 42 SIM_DET TXD 12 RXD 13 41 VSIM RXD 13 GND 14 40 SIM_RST GND 14 PWR_ON 15 39 SIM_IO PWR_ON GPIO1 16 38 SIM_CLK RSVD 17 37 RESET_N 18 RSVD 19 GND 20 GND 21 79 80 SARA-G3 Top View 81 82 83 84 Pin 65-96: GND 85 86 87 88 89 90 91 92 93 94 95 96 RSVD DSR 6 47 RSVD RI 7 46 RSVD DCD 8 45 RSVD DTR 9 44 RSVD RTS 10 43 GND CTS 11 42 SIM_DET TXD 12 41 VSIM RXD 13 40 SIM_RST GND 14 15 39 SIM_IO PWR_ON GPIO1 16 38 SIM_CLK I2S_RXD VUSB_DET 17 37 36 I2S_CLK RESET_N 18 35 I2S_TXD CODEC_CLK 19 34 I2S_WA GND 20 33 RSVD GND 21 79 80 SARA-U2 Top View 81 82 83 84 Pin 65-96: GND 85 86 87 88 89 90 91 92 93 94 95 96 4 49 SDIO_D1 GND 5 48 SDIO_D3 RSVD 6 47 SDIO_D0 RSVD 7 46 SDIO_CMD RSVD 8 45 SDIO_CLK RSVD 9 44 SDIO_D2 RTS 10 43 GND CTS 11 42 GPIO5 TXD 12 41 VSIM RXD 13 40 SIM_RST GND 14 15 39 SIM_IO RSVD GPIO1 16 38 SIM_CLK I2S_RXD VUSB_DET 17 37 I2S_RXD/SPI_MISO 36 I2S_CLK RESET_N 18 35 I2S_TXD GPIO6 19 34 I2S_WA GND 20 33 RSVD GND 21 77 78 79 80 SARA-R4/N4 Top View 81 82 83 84 Pin 65-96: GND 85 86 87 88 89 90 91 92 93 94 95 96 GND GND ANT GND GND GND GND GND ANT_DET GND GND GND GND ANT GND GND GND GND GND ANT_DET V_INT 22 23 24 25 26 27 28 29 30 31 32 GND GND GND GND GND ANT GND GND GND GND 5 GND RSVD GND TXD_AUX RXD_AUX SCL SDA GPIO4 GND GPIO2 GND GND 22 23 24 25 26 27 28 29 30 31 32 GPIO3 ANT_DET RSVD 48 53 VCC 52 VCC 51 VCC 50 GND 49 RSVD 48 RSVD 47 RSVD 46 RSVD 45 RSVD 44 RSVD 43 GND 42 RSVD 41 VSIM 40 SIM_RST 15 39 SIM_IO GPIO1 16 38 SIM_CLK RSVD 17 37 RSVD 36 I2S_CLK/SPI_CLK RESET_N 18 36 RSVD 35 I2S_TXD/SPI_CS RSVD 19 35 RSVD 34 I2S_WA/SPI_MOSI GND 20 34 RSVD 33 RSVD GND 21 33 RSVD 22 23 24 25 26 27 28 29 30 31 32 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 SARA-N2 Top View 81 82 83 84 Pin 65-96: GND 85 86 87 88 89 90 91 92 93 94 95 96 22 23 24 25 26 27 28 29 30 31 32 GND DSR GND 76 RSVD 9 49 78 50 75 GND 8 DTR 4 74 GND DCD V_INT GND 7 GND RSVD RI 50 77 3 73 RSVD MIC_N 6 GND 72 RSVD 5 VCC 71 SCL GND 51 70 SDA MIC_P 48 2 69 RSVD 49 78 1 RSVD 68 GND 4 GND VCC 67 RSVD V_INT 76 VCC 52 66 GPIO2 GND 75 64 63 62 61 60 59 58 57 56 55 54 53 65 GND 50 77 3 74 GND DSR 6 GND 73 USB_D+ 5 VCC 72 SCL GND 51 71 USB_D- 4 76 70 SDA V_INT 75 2 69 RSVD 3 74 1 RSVD 68 GND GND 73 GND VCC 67 USB_D+ VCC 72 VCC 52 66 USB_D- 51 71 64 63 62 61 60 59 58 57 56 55 54 53 65 GPIO4 3 70 SCL 2 69 SDA 1 V_BCKP 68 GPIO4 GND VCC 67 GPIO2 VCC 52 66 GPIO2 GND 64 63 62 61 60 59 58 57 56 55 54 53 65 GPIO3 1 2 GPIO3 64 63 62 61 60 59 58 57 56 55 54 GND V_BCKP GND GND GND GND ANT GND GND GND GND GND ANT_DET GND GND SARA-G3 2G modules, SARA-U2 3G / 2G modules, SARA-R4/N4 LTE Cat M1/NB1 / 2G modules and SARA-N2 LTE Cat NB1 modules have exactly the same u-blox SARA form factor (26.0 x 16.0 mm, LGA 96-pin), with compatible pin assignments, as in Figure 59. Any one of the modules can be mounted on a single application board using exactly the same copper mask, solder mask and paste mask. Figure 59: SARA-G3, SARA-U2, SARA-R4/N4 and SARA-N2 modules’ layout and pin assignment LTE M1 / NB1, 2G • • • SARA-N2 LTE NB1 • • • • • • • • • • • • • • ● = supported by available product version • • □ • □ • GNSS via modem SARA-R4/N4 • • Antenna detection • • Network indication • • GPIOs • • Other 13/26 MHz output • • Digital audio 3G, 2G • Analog audio SARA-U2 • DDC (I2C) • Audio SDIO • USB • SPI • UART AUX 2G Serial UART Switch-on input SARA-G3 SIM SIM detection 1.8 V supply Output System SIM interface RTC supply I/O Power Reset input RAT Switch-off input Modules Module supply input Table 39 summarizes the interfaces provided by the SARA-G3, SARA-U2, SARA-R4/N4, SARA-N2 modules. • • • • • • • • • • • • □ □ • • • • • • • □ = supported by future product versions Table 39: Summary of SARA-G3, SARA-U2, SARA-R4/N4 and SARA-N2 modules interfaces UBX-16029218 - R11 Appendix Page 105 of 116 SARA-R4/N4 series - System Integration Manual SARA modules are also form-factor compatible with the u-blox LISA, LARA and TOBY cellular module families: although each has a different form factor, the footprints for the TOBY, LISA, SARA and LARA modules have been developed to ensure layout compatibility. With the u-blox “nested design” solution, any TOBY, LISA, SARA or LARA module can be alternatively mounted on the same space of a single “nested” application board as described in Figure 60. Guidelines for implementing a nested application board, a description of the u-blox reference nested design and a comparison between the TOBY, LISA, SARA and LARA modules are provided in the Nested Design Application Note [21]. TOBY cellular module LISA cellular module LARA cellular module SARA cellular module Nested application board Figure 60: TOBY, LISA, SARA, LARA modules’ layout compatibility: all modules lodged on the same nested footprint UBX-16029218 - R11 Appendix Page 106 of 116 SARA-R4/N4 series - System Integration Manual A.2 Pin-out comparison Table 40 shows a pin-out comparison between the SARA-G3, SARA-U2, SARA-R4/N4, and SARA-N2 modules. No SARA-G3 Pin Name Description SARA-U2 Pin Name Description SARA-R4 Pin Name Description SARA-N2 Pin Name Description 1 GND Ground GND Ground GND Ground GND Ground 2 V_BCKP RTC Supply I/O V_BCKP RTC Supply I/O RSVD Reserved RSVD Reserved 3 GND Ground GND Ground GND Ground GND Ground 4 V_INT Interfaces Supply Output: 1.8 V typ, 70 mA max V_INT Interfaces Supply Output: 1.8 V typ, 70 mA max V_INT Interfaces Supply Output: 1.8 V typ, 70 mA max Switched-off in deep-sleep V_INT Interfaces Supply Output: 1.8 V typ, 70 mA max Switched-off if radio is off 5 GND Ground GND Ground GND Ground GND Ground 6 DSR UART DSR Output V_INT level (1.8 V) Driver strength: 6 mA DSR UART DSR Output V_INT level (1.8 V) Driver strength: 1 mA DSR UART DSR Output V_INT level (1.8 V) Driver strength: 2 mA RSVD Reserved Not supported by N2 Diverse driver strength 7 RI UART RI Output V_INT level (1.8 V) Driver strength: 6 mA RI UART RI Output V_INT level (1.8 V) Driver strength: 2 mA RI UART RI Output V_INT level (1.8 V) Driver strength: 2 mA RSVD Reserved Not supported by N2 Diverse driver strength 8 DCD UART DCD Output V_INT level (1.8 V) Driver strength: 6 mA DCD UART DCD Output V_INT level (1.8 V) Driver strength: 2 mA DCD UART DCD Output V_INT level (1.8 V) Driver strength: 2 mA RSVD Reserved Not supported by N2 Diverse driver strength 9 DTR UART DTR Input V_INT level (1.8 V) Internal pull-up: ~33 k It must be set low to have greeting text sent over UART DTR UART DTR Input V_INT level (1.8 V) Internal pull-up: ~14 k It must be set low to have greeting text sent over UART DTR UART DTR Input V_INT level (1.8 V) Internal pull-up: ~100 k It must be set low to have URCs sent over UART RSVD Reserved Not supported by N2 Diverse internal pull-up value 10 RTS UART RTS Input V_INT level (1.8 V) Internal pull-up:~58 k RTS UART RTS Input V_INT level (1.8 V) Internal pull-up: ~8 k RTS UART RTS Input21 V_INT level (1.8 V) Internal pull-up: ~100 k It must be set low to use UART on ‘00’, ‘01’ product versions RTS UART RTS Input21 VCC level (3.6 V typ.) Internal pull-up: ~78 k Diverse level (V_INT vs VCC); Diverse internal pull-up value; Diverse functions supported. 21 Remarks for migration RTC supply vs Reserved V_INT is switched off in deep sleep (R4), or if radio is off (N2). TestPoint always recommended Not supported by “00”, “01”, SARA-R410M-02B product versions and SARA-N2 modules UBX-16029218 - R11 Appendix Page 107 of 116 SARA-R4/N4 series - System Integration Manual No SARA-G3 Pin Name Description SARA-U2 Pin Name Description SARA-R4 Pin Name Description Description Remarks for migration UART CTS Output21 VCC level (3.6 V typ.) Driver strength: 1 mA Configurable as Ring Indicator or Network Indicator Diverse level (V_INT vs VCC) Diverse driver strength. Diverse functions supported. UART Data Input TXD V_INT level (1.8 V) Internal pull-up/-down: ~100k UART Data Input VCC level (3.6 V typ.) No internal pull-up/-down Diverse level (V_INT vs VCC); Diverse pull-up / pull-down; TestPoint always recommended RXD UART Data Output V_INT level (1.8 V) Driver strength: 2 mA RXD UART Data Output VCC level (3.6 V typ.) Driver strength: 1 mA Diverse level (V_INT vs VCC); Diverse driver strength; TestPoint always recommended Ground GND Ground GND Ground Power-on Input No internal pull-up L-level: -0.30 V ÷ 0.65 V H-level: 1.50 V ÷ 4.40 V ON L-level pulse time: 50 µs min / 80 µs max OFF L-level pulse time: 1 s min PWR_ON Power-on Input 200 k internal pull-up L-level: -0.30 V ÷ 0.35 V H-level: 1.17 V ÷ 2.10 V ON L-level pulse time: 0.15 s min – 3.2 s max OFF L-level pulse time: 1.5 s min RSVD Reserved GPIO1 GPIO V_INT level (1.8 V) Default: Pin disabled Driver strength: 6 mA GPIO1 GPIO V_INT level (1.8 V) Default: Pin disabled Driver strength: 2 mA GPIO1 GPIO Diverse driver strength V_INT level (1.8 V) TestPoint recommended for N2 Configurable as secondary UART data output: TestPoint recommended for diagnostic Reserved VUSB_DET 5 V, USB Supply Detect Input VUSB_DET 5 V, USB Supply Detect Input RSVD Reserved USB detection vs Reserved; TestPoint recommended for U2/R4 Reset input Internal diode & pull-up L-level: -0.30 V ÷ 0.30 V H-level: 2.00 V ÷ 4.70 V Reset L-level pulse time: 50 ms min (G340/G350) 3 s min (G300/G310) RESET_N Abrupt shutdown/reset input RESET_N 10 k internal pull-up L-level: -0.30 V ÷ 0.51 V H-level: 1.32 V ÷ 2.01 V Reset L-level pulse time: 50 ms min Abrupt shutdown input 37 k internal pull-up L-level: -0.30 V ÷ 0.35 V H-level: 1.17 V ÷ 2.10 V OFF L-level pulse time: 10 s min Reset input 78 k internal pull-up L-level: -0.30 V ÷ 0.36*VCC H-level: 0.52*VCC ÷ VCC Reset L-level pulse time: 500 ns min Diverse internal pull-up Diverse voltage levels. Diverse timings. Diverse functions supported. TestPoint always recommended 11 CTS UART CTS Output V_INT level (1.8 V) Driver strength: 6 mA CTS UART CTS Output V_INT level (1.8 V) Driver strength: 6 mA CTS UART CTS Output21 V_INT level (1.8 V) Driver strength: 2 mA 12 TXD UART Data Input V_INT level (1.8 V) Internal pull-up:~18 k TXD UART Data Input V_INT level (1.8 V) Internal pull-up: ~8 k TXD 13 RXD UART Data Output V_INT level (1.8 V) Driver strength: 6 mA RXD UART Data Output V_INT level (1.8 V) Driver strength: 6 mA 14 GND Ground GND 15 PWR_ON Power-on Input No internal pull-up L-level: -0.10 V ÷ 0.65 V H-level: 2.00 V ÷ 4.50 V ON L-level time: 5 ms min OFF L-level pulse time: Not Available PWR_ON 16 GPIO1 / RSVD GPIO (G340/G350) Reserved (G300/G310) V_INT level (1.8 V) Default: Pin disabled Driver strength: 6 mA 17 RSVD 18 RESET_N UBX-16029218 - R11 SARA-N2 Pin Name Appendix CTS RESET_N Not supported by N2; Internal vs No internal pull-up; Diverse voltage levels; Diverse timings; Diverse functions supported; TestPoint recommended for R4 Page 108 of 116 SARA-R4/N4 series - System Integration Manual No SARA-G3 Pin Name Description SARA-N2 Pin Name 19 RSVD Reserved CODEC_CLK 13 or 26 MHz Output V_INT level (1.8 V) Default: Pin disabled Driver strength: 4 mA GPIO6 Description Remarks for migration GPIO V_INT level (1.8 V) Default: Pin disabled Driver strength: 2 mA RSVD Reserved Clock / GPIO vs Reserved 20 GND Ground GND Ground 21 GND Ground GND Ground GND Ground GND Ground GND Ground GND 22 GND Ground GND Ground Ground GND Ground GND Ground 23 GPIO2 / RSVD GPIO (G340/G350) GPIO2 Reserved (G300/G310) V_INT level (1.8 V) Default: GNSS supply enable Driver strength: 6 mA GPIO GPIO2 V_INT level (1.8 V) Default: GNSS supply enable Driver strength: 1 mA GPIO V_INT level (1.8 V) Default: Pin disabled Driver strength: 2 mA RSVD Reserved GPIO vs Reserved 24 GPIO3 / 32K_OUT GPIO (G340/G350) 32 kHz Output (G300/G310) V_INT level (1.8 V) Default: GNSS data ready Driver strength: 5 mA GPIO3 GPIO V_INT level (1.8 V) Default: GNSS data ready Driver strength: 6 mA GPIO3 GPIO V_INT level (1.8 V) Default: Pin disabled Driver strength: 2 mA GPIO2 GPIO23 V_INT level (1.8 V) Default: Pin disabled Driver strength: 1 mA Diverse driver strength 25 GPIO4 / RSVD GPIO (G340/G350) Reserved (G300/G310) V_INT level (1.8 V) Default: GNSS RTC sharing Driver strength: 6 mA GPIO4 GPIO V_INT level (1.8 V) Default: GNSS RTC sharing Driver strength: 6 mA GPIO4 GPIO V_INT level (1.8 V) Default: Output/Low Driver strength: 2 mA RSVD Reserved GPIO vs Reserved 26 SDA / RSVD I2C Data I/O (G340/G350) Reserved (G300/G310) V_INT level (1.8 V) Open drain No internal pull-up SDA I2C Data I/O / AUX UART in (‘04’ version) V_INT level (1.8 V) Open drain No internal pull-up SDA I2C Data I/O22 V_INT level (1.8 V) Open drain Internal 2.2 k pull-up SDA I2C Data I/O23 V_INT level (1.8 V) Open drain No internal pull-up Internal vs No internal pull-up 27 SCL / RSVD I2C Clock Out (G340/G350) Reserved (G300/G310) V_INT level (1.8 V) Open drain No internal pull-up SCL I2C Clock Output / AUX UART out (‘04’ version) V_INT level (1.8 V) Open drain No internal pull-up SCL I2C Clock Output22 V_INT level (1.8 V) Open drain Internal 2.2 k pull-up SCL I2C Clock Output23 V_INT level (1.8 V) Open drain No internal pull-up Internal vs No internal pull-up 28 RXD_AUX Aux UART Data Out V_INT level (1.8 V) USB_D- USB Data I/O (D-) High-Speed USB 2.0 USB_D- USB Data I/O (D-) High-Speed USB 2.0 RSVD Reserved USB / AUX UART vs Reserved TestPoint recommended for SARA-G3/U2/R4 modules 22 23 SARA-U2 Pin Name Description SARA-R4 Pin Name Description Not supported by “00” and “01” product versions Not supported by “02” product versions UBX-16029218 - R11 Appendix Page 109 of 116 SARA-R4/N4 series - System Integration Manual No SARA-G3 Pin Name SARA-U2 Pin Name Description SARA-R4 Pin Name Description SARA-N2 Pin Name Description Remarks for migration 29 TXD_AUX Aux UART Data In V_INT level (1.8 V) USB_D+ USB Data I/O (D+) High-Speed USB 2.0 USB_D+ USB Data I/O (D+) High-Speed USB 2.0 RSVD Reserved USB / AUX UART vs Reserved TestPoint recommended for SARA-G3/U2/R4 modules 30 GND Ground GND Ground GND Ground GND Ground 31 RSVD / EXT32K Reserved (G340/G350) 32 kHz Input (G300/G310) RSVD Reserved RSVD Reserved RSVD Reserved 32 GND Ground GND Ground GND Ground GND Ground 33 RSVD It must be connected to GND RSVD It must be connected to GND RSVD It can be connected to GND RSVD It can be connected to GND 34 I2S_WA / RSVD I2S Word Align.(G340/G350) Reserved (G300/G310) V_INT level (1.8 V) Driver strength: 6 mA I2S_WA I2S Word Alignment V_INT level (1.8 V) Driver strength: 2 mA I2S_WA / SPI_MOSI I2S Word / SPI MOSI24 V_INT level (1.8 V) Driver strength: 2 mA RSVD Reserved I2S vs SPI vs Reserved 35 I2S_TXD / RSVD I2S Data Output (G340/G350) Reserved (G300/G310) V_INT level (1.8 V) Driver strength: 5 mA I2S_TXD I2S Data Output V_INT level (1.8 V) Driver strength: 2 mA I2S_TXD / SPI_CS I2S Data Out24 / SPI chip select24 V_INT level (1.8 V) Driver strength: 2 mA RSVD Reserved I2S vs SPI vs Reserved 36 I2S_CLK / RSVD I2S Clock (G340/G350) Reserved (G300/G310) V_INT level (1.8 V) Driver strength: 5 mA I2S_CLK I2S Clock V_INT level (1.8 V) Driver strength: 2 mA I2S_CLK / SPI_CLK I2S Clock24 / SPI clock24 V_INT level (1.8 V) Driver strength: 2 mA RSVD Reserved I2S vs SPI vs Reserved 37 I2S_RXD / RSVD I2S Data Input (G340/G350) Reserved (G300/G310) V_INT level (1.8 V) I2S_RXD I2S Data Input V_INT level (1.8 V) I2S_RXD / SPI_MISO I2S Data Input24 / SPI MISO24 RSVD V_INT level (1.8 V) Reserved I2S vs SPI vs Reserved 38 SIM_CLK 1.8V/3V SIM Clock Output SIM_CLK 1.8V/3V SIM Clock Output SIM_CLK 1.8V/3V SIM Clock Output SIM_CLK 1.8V SIM Clock Output 39 SIM_IO 1.8V/3V SIM Data I/O Internal 4.7 k pull-up SIM_IO 1.8V/3V SIM Data I/O Internal 4.7 k pull-up SIM_IO 1.8V/3V SIM Data I/O Internal 4.7 k pull-up SIM_IO 1.8V SIM Data I/O Internal 4.7 k pull-up 40 SIM_RST 1.8V/3V SIM Reset Output SIM_RST 1.8V/3V SIM Reset Output SIM_RST 1.8V/3V SIM Reset Output SIM_RST 1.8V SIM Reset Output 41 VSIM 1.8V/3V SIM Supply Output VSIM 1.8V/3V SIM Supply Output VSIM 1.8V/3V SIM Supply Output VSIM 1.8V SIM Supply Output 42 SIM_DET SIM Detection Input V_INT level (1.8 V) SIM_DET SIM Detection Input V_INT level (1.8 V) GPIO5 SIM Detection Input V_INT level (1.8 V) RSVD Reserved 43 GND Ground GND Ground GND Ground GND Ground 44 SPK_P / RSVD Analog Audio Out (+) / Reserved RSVD Reserved SDIO_D2 SDIO serial data [2]24 RSVD Reserved 24 Description Alignm24 32 kHz Input vs Reserved SIM Detection vs Reserved Analog Audio vs SDIO vs RSVD Not supported by “00”, “01” and “x2” product version UBX-16029218 - R11 Appendix Page 110 of 116 SARA-R4/N4 series - System Integration Manual No SARA-G3 Pin Name Description SARA-U2 Pin Name Description SARA-R4 Pin Name Description SARA-N2 Pin Name 45 SPK_N / RSVD Description Remarks for migration Analog Audio Out (-) / Reserved RSVD Reserved SDIO_CLK SDIO serial clock24 RSVD Reserved Analog Audio vs SDIO vs RSVD 46 MIC_BIAS / RSVD Microphone Supply Out / Reserved RSVD Reserved SDIO_CMD SDIO command24 RSVD Reserved Analog Audio vs SDIO vs RSVD 47 MIC_GND / RSVD Microphone Ground / Reserved RSVD Reserved SDIO_D0 SDIO serial data [0]24 RSVD Reserved Analog Audio vs SDIO vs RSVD 48 MIC_N / RSVD Analog Audio In (-) / Reserved RSVD Reserved SDIO_D3 SDIO serial data [3]24 RSVD Reserved Analog Audio vs SDIO vs RSVD 49 MIC_P / RSVD Analog Audio In (+) / Reserved RSVD Reserved SDIO_D1 SDIO serial data [1]24 RSVD Reserved Analog Audio vs SDIO vs RSVD 50 GND Ground GND Ground GND Ground GND Ground 51-53 VCC Module Supply Input Normal op. range: 3.35 V – 4.5 V Extended op. range: 3.00 V – 4.5 V Current consumption: ~2.0A pulse current in 2G Switch-on applying VCC VCC Module Supply Input Normal op. range: 3.3 V – 4.4 V Extended op. range: 3.1 V – 4.5 V Current consumption: ~2.0A pulse current in 2G Switch-on applying VCC VCC Module Supply Input Normal op. range: 3.2 V – 4.2 V Extended op. range: 3.0 V – 4.3 V Current consumption: ~2.0A pulse current in 2G (recommended ≥100uF) ~0.5A LTE pulse current (recommended ≥10uF) No turn-on applying VCC VCC Module Supply Input Normal op. range: 3.1 V – 4.0 V Extended op. range: 2.75 V – 4.2 V Current consumption: ~0.3A LTE pulse current (recommended ≥100uF) Switch-on applying VCC 54-55 GND Ground GND Ground GND Ground GND Ground 56 ANT RF Antenna I/O ANT RF Antenna I/O ANT RF Antenna I/O ANT RF Antenna I/O 57-61 GND Ground GND Ground GND Ground GND Ground 62 ANT_DET / RSVD Antenna Detection Input / Reserved ANT_DET Antenna Detection Input ANT_DET Antenna Detection Input ANT_DET Antenna Detection Input 25 63-96 GND Ground GND Ground GND Ground GND Ground Diverse voltage levels. Diverse current consumption. Recommended external capacitors and other parts for EMI suppression may differ. Regular pF / nF recommended. Diverse functions supported. Diverse bands supported Antenna Detection vs Reserved Table 40: SARA-G3, SARA-U2, SARA-R4/N4 and SARA-N2 series modules pin assignments with remarks for migration ☞ 25 For further details regarding the characteristics, capabilities, usage or settings applicable for each interface of the SARA-G3, SARA-U2, SARA-R4/N4 and SARA-N2 series cellular modules, see the related Data Sheet [1], [16], [17], [18], the related System Integration Manual [19], [20], and the Nested Design Application Note [21]. Not supported by “02” product version UBX-16029218 - R11 Appendix Page 111 of 116 SARA-R4/N4 series - System Integration Manual B Glossary Abbreviation Definition 2G 2nd Generation Cellular Technology (GSM, GPRS, EGPRS) 3G 3rd Generation Cellular Technology (UMTS, HSDPA, HSUPA) 3GPP 3rd Generation Partnership Project 8-PSK 8 Phase-Shift Keying modulation ADC Analog to Digital Converter AT AT Command Interpreter Software Subsystem, or attention Cat Category CE European Conformity DC Direct Current DCE Data Communication Equipment DDC Display Data Channel interface DL Down-Link (Reception) DTE Data Terminal Equipment EDGE Enhanced Data rates for GSM Evolution (EGPRS) eDRX Extended Discontinuous Reception EGPRS Enhanced General Packet Radio Service (EDGE) EMC Electro-Magnetic Compatibility EMI Electro-Magnetic Interference ESD Electro-Static Discharge ESR Equivalent Series Resistance E-UTRA Evolved Universal Terrestrial Radio Access FCC Federal Communications Commission United States FDD Frequency Division Duplex FOAT Firmware Over AT commands FOTA Firmware Over The Air FTP File Transfer Protocol FW Firmware GCF Global Certification Forum GMSK Gaussian Minimum-Shift Keying modulation GND Ground GNSS Global Navigation Satellite System GPIO General Purpose Input Output GPRS General Packet Radio Service GPS Global Positioning System HBM Human Body Model HTTP HyperText Transfer Protocol HW Hardware IFT Federal Telecommunications Institute Mexico 2 IC Inter-Integrated Circuit interface I2S Inter IC Sound interface ISED Innovation, Science and Economic Development Canada LDO Low-Dropout LGA Land Grid Array UBX-16029218 - R11 Appendix Page 112 of 116 SARA-R4/N4 series - System Integration Manual Abbreviation Definition LNA Low Noise Amplifier LPWA Low Power Wide Area LTE Long Term Evolution LWM2M Open Mobile Alliance Lightweight Machine-to-Machine protocol M2M Machine-to-Machine MQTT Message Queuing Telemetry Transport N/A Not Applicable NAS Non Access Stratum OEM Original Equipment Manufacturer device: an application device integrating a u-blox cellular module OTA Over The Air PA Power Amplifier PCM Pulse Code Modulation PCN Product Change Notification / Sample Delivery Note / Information Note PFM Pulse Frequency Modulation PSM Power Saving Mode PTCRB PCS Type Certification Review Board PWM Pulse Width Modulation QPSK Quadrature Phase Shift Keying RAT Radio Access Technology RF Radio Frequency RSE Radiated Spurious Emission RTC Real Time Clock SAW Surface Acoustic Wave SDIO Secure Digital Input Output SIM Subscriber Identification Module SMS Short Message Service SPI Serial Peripheral Interface SRF Self-Resonant Frequency SSL Secure Socket Layer TBD To Be Defined TCP Transmission Control Protocol TDD Time Division Duplex TDMA Time Division Multiple Access TIS Total Isotropic Sensitivity TP Test-Point TRP Total Radiated Power UART Universal Asynchronous Receiver-Transmitter UDP User Datagram Protocol UICC Universal Integrated Circuit Card UL Up-Link (Transmission) UMTS Universal Mobile Telecommunications System USB Universal Serial Bus VoLTE Voice over LTE VSWR Voltage Standing Wave Ratio Table 41: Explanation of the abbreviations and terms used UBX-16029218 - R11 Appendix Page 113 of 116 SARA-R4/N4 series - System Integration Manual Related documents [1] [2] [3] [4] u-blox SARA-R4/N4 series Data Sheet, document number UBX-16024152 u-blox SARA-R4/N4 series AT Commands Manual, document number UBX-17003787 u-blox EVK-R4/N4 User Guide, document number UBX-16029216 Universal Serial Bus Revision 2.0 specification, http://www.usb.org/developers/docs/usb20_docs/ [5] ITU-T Recommendation V.24 - 02-2000 - List of definitions for interchange circuits between Data Terminal Equipment (DTE) and Data Circuit-terminating Equipment (DCE), http://www.itu.int/rec/T-REC-V.24-200002-I/en [6] 3GPP TS 27.007 - AT command set for User Equipment (UE) [7] 3GPP TS 27.005 - Use of Data Terminal Equipment - Data Circuit terminating; Equipment (DTE - DCE) interface for Short Message Service (SMS) and Cell Broadcast Service (CBS) [8] 3GPP TS 27.010 - Terminal Equipment to User Equipment (TE-UE) multiplexer protocol [9] I2C-bus specification and user manual - Rev. 5 - 9 October 2012 - NXP Semiconductors, http://www.nxp.com/documents/user_manual/UM10204.pdf [10] GSM Association TS.09 - Battery Life Measurement and Current Consumption Technique, https://www.gsma.com/newsroom/wp-content/uploads/TS.09_v10.1.pdf [11] 3GPP TS 36.521-1 - Evolved Universal Terrestrial Radio Access; User Equipment conformance specification; Radio transmission and reception; Part 1: Conformance Testing [12] 3GPP TS 36.521-2 - Evolved Universal Terrestrial Radio Access (E-UTRA); User Equipment conformance specification; Radio transmission and reception; Part 2: Implementation Conformance Statement (ICS) [13] 3GPP TS 36.523-2 - Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Packet Core (EPC); User Equipment conformance specification; Part 2: Implementation Conformance Statement (ICS) [14] u-blox End user test Application Note, document number UBX-13001922 [15] u-blox Package Information Guide, document number UBX-14001652 [16] u-blox SARA-G3 series Data Sheet, document number UBX-13000993 [17] u-blox SARA-U2 series Data Sheet, document number UBX-13005287 [18] u-blox SARA-N2 series Data Sheet, document number UBX-15025564 [19] u-blox SARA-G3/SARA-U2 series System Integration Manual, document num. UBX-13000995 [20] u-blox SARA-N2 series System Integration Manual, document number UBX-17005143 [21] u-blox Nested Design Application Note, document number UBX-16007243 ☞ For regular updates to u-blox documentation and to receive product change notifications, register on our homepage (www.u-blox.com). UBX-16029218 - R11 Related documents Page 114 of 116 SARA-R4/N4 series - System Integration Manual Revision history Revision Date Name Comments R01 31-Jan-2017 sfal Initial release R02 05-May-2017 sfal / sses Updated supported features and characteristics Extended document applicability to SARA-R410M-01B product version R03 24-May-2017 sses Updated supported features and electrical characteristics R04 19-Jul-2017 sses Updated supported features and electrical characteristics Added FCC and ISED info for SARA-R410M-01B modules Extended document applicability to SARA-R410M-02B product version R05 17-Aug-2017 sses Updated supported features for “02” product version R06 30-Oct-2017 sses Updated supported features for “02” product version R07 04-Jan-2018 sses Updated SARA-R410M-02B product status Updated USB, Power Saving and GPIO features description Improved Power-on sequence guidelines description Added I2C design guidelines description R08 26-Feb-2018 sses Updated SARA-R410M-02B product status Extended document applicability to SARA-R412M-02B product version Corrected power-on sequence description Corrected UART MUX description R09 10-Aug-2018 sses Extended document applicability to SARA-R410M-52B and SARA-N410-02B product version Updated SARA-R410M-02B and SARA-R412M-02B product status Updated features support plan for the product versions Clarified supported bands Updated UART TXD and CTS info Updated Approvals info and related remarks Added description of AT Inactivity Timer to enter power saving mode Minor other corrections R10 20-Sep-2018 lpah / sses Extended document applicability to SARA-R404M-00B-01 type number Clarified mode supported in frequency bands Added further guidelines for VCC and Antenna circuits design R11 20-Feb-2019 sses Updated SARA-N410-02B and SARA-R412M-02B product status Revised supported bands Updated certification info Clarified VCC and RESET_N guidelines Minor other corrections and clarifications UBX-16029218 - R11 Revision history Page 115 of 116 SARA-R4/N4 series - System Integration Manual Contact For complete contact information, visit us at www.u-blox.com. u-blox Offices North, Central and South America u-blox America, Inc. Phone: E-mail: +1 703 483 3180 info_us@u-blox.com Regional Office West Coast: Phone: E-mail: +1 408 573 3640 info_us@u-blox.com Headquarters Europe, Middle East, Africa Asia, Australia, Pacific u-blox AG Phone: +65 6734 3811 E-mail: info_ap@u-blox.com Support: support_ap@u-blox.com Phone: +41 44 722 74 44 E-mail: info@u-blox.com Support: support@u-blox.com Regional Office Australia: Phone: +61 2 8448 2016 E-mail: info_anz@u-blox.com Support: support_ap@u-blox.com Technical Support: Phone: E-mail: u-blox Singapore Pte. Ltd. +1 703 483 3185 support@u-blox.com Regional Office China (Beijing): Phone: +86 10 68 133 545 E-mail: info_cn@u-blox.com Support: support_cn@u-blox.com Regional Office China (Chongqing): Phone: +86 23 6815 1588 E-mail: info_cn@u-blox.com Support: support_cn@u-blox.com Regional Office China (Shanghai): Phone: +86 21 6090 4832 E-mail: info_cn@u-blox.com Support: support_cn@u-blox.com Regional Office China (Shenzhen): Phone: +86 755 8627 1083 E-mail: info_cn@u-blox.com Support: support_cn@u-blox.com Regional Office India: Phone: +91 80 405 092 00 E-mail: info_in@u-blox.com Support: support_in@u-blox.com Regional Office Japan (Osaka): Phone: +81 6 6941 3660 E-mail: info_jp@u-blox.com Support: support_jp@u-blox.com Regional Office Japan (Tokyo): Phone: +81 3 5775 3850 E-mail: info_jp@u-blox.com Support: support_jp@u-blox.com Regional Office Korea: Phone: +82 2 542 0861 E-mail: info_kr@u-blox.com Support: support_kr@u-blox.com Regional Office Taiwan: Phone: +886 2 2657 1090 E-mail: info_tw@u-blox.com Support: support_tw@u-blox.com UBX-16029218 - R11 Contact Page 116 of 116
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