Sierra Wireless AR7558 Cellular/PCS GSM/EDGE/CDMA/WCDMA/LTE Modem User Manual Hardware Integration Guide

Sierra Wireless Inc. Cellular/PCS GSM/EDGE/CDMA/WCDMA/LTE Modem Hardware Integration Guide

User Manual

4116922 1.1 March 9, 2015 AirPrime AR7558 Hardware Integration Guide
4116922 Rev 1.1 January 21, 2015 2 Hardware Integration Guide Important Notice Due to the nature of wireless communications, transmission and reception of data can never be guaranteed. Data may be delayed, corrupted (i.e., have errors) or be totally lost. Although significant delays or losses of data are rare when wireless devices such as the Sierra Wireless modem are used in a normal manner with a well-constructed network, the Sierra Wireless modem should not be used in situations where failure to transmit or receive data could result in damage of any kind to the user or any other party, including but not limited to personal injury, death, or loss of property. Sierra Wireless accepts no responsibility for damages of any kind resulting from delays or errors in data transmitted or received using the Sierra Wireless modem, or for failure of the Sierra Wireless modem to transmit or receive such data. Safety and Hazards Do not operate the Sierra Wireless modem in areas where cellular modems are not advised without proper device certifications. These areas include environments where cellular radio can interfere such as explosive atmospheres, medical equipment, or any other equipment which may be susceptible to any form of radio interference. The Sierra Wireless modem can transmit signals that could interfere with this equipment. Do not operate the Sierra Wireless modem in any aircraft, whether the aircraft is on the ground or in flight. In aircraft, the Sierra Wireless modem MUST BE POWERED OFF. When operating, the Sierra Wireless modem can transmit signals that could interfere with various onboard systems. Note: Some airlines may permit the use of cellular phones while the aircraft is on the ground and the door is open. Sierra Wireless modems may be used at this time. The driver or operator of any vehicle should not operate the Sierra Wireless modem while in control of a vehicle. Doing so will detract from the driver or operator’s control and operation of that vehicle. In some states and provinces, operating such communications devices while in control of a vehicle is an offence. Limitations of Liability This manual is provided “as is”. Sierra Wireless makes no warranties of any kind, either expressed or implied, including any implied warranties of merchantability, fitness for a particular purpose, or noninfringement. The recipient of the manual shall endorse all risks arising from its use. The information in this manual is subject to change without notice and does not represent a commitment on the part of Sierra Wireless. SIERRA WIRELESS AND ITS AFFILIATES SPECIFICALLY DISCLAIM LIABILITY FOR ANY AND ALL DIRECT, INDIRECT, SPECIAL, GENERAL, INCIDENTAL, CONSEQUENTIAL, PUNITIVE OR EXEMPLARY DAMAGES INCLUDING, BUT NOT LIMITED TO, LOSS OF PROFITS OR REVENUE OR ANTICIPATED PROFITS OR REVENUE ARISING OUT OF THE USE OR INABILITY TO USE ANY SIERRA WIRELESS PRODUCT, EVEN IF SIERRA WIRELESS AND/OR ITS AFFILIATES HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES OR THEY ARE FORESEEABLE OR FOR CLAIMS BY ANY THIRD PARTY. Notwithstanding the foregoing, in no event shall Sierra Wireless and/or its affiliates aggregate liability arising under or in connection with the Sierra Wireless product, regardless of the number of events, occurrences, or claims giving rise to liability, be in excess of the price paid by the purchaser for the Sierra Wireless product. Customer understands that Sierra Wireless is not providing cellular or GPS (including A-GPS) services. These services are provided by a third party and should be purchased directly by the Customer.
4116922 Rev 1.1 January 21, 2015 3 Hardware Integration Guide SPECIFIC DISCLAIMERS OF LIABILITY: CUSTOMER RECOGNIZES AND ACKNOWLEDGES SIERRA WIRELESS IS NOT RESPONSIBLE FOR AND SHALL NOT BE HELD LIABLE FOR ANY DEFECT OR DEFICIENCY OF ANY KIND OF CELLULAR OR GPS (INCLUDING A-GPS) SERVICES. Patents This product may contain technology developed by or for Sierra Wireless Inc. This product includes technology licensed from QUALCOMM®. This product is manufactured or sold by Sierra Wireless Inc. or its affiliates under one or more patents licensed from InterDigital Group and MMP Portfolio Licensing. Copyright © 2015 Sierra Wireless. All rights reserved. Trademarks Sierra Wireless®, AirPrime®, AirLink®, AirVantage®, WISMO® and the Sierra Wireless and Open AT logos are registered trademarks of Sierra Wireless, Inc. or one of its subsidiaries. Watcher® is a registered trademark of Netgear, Inc., used under license. Windows® and Windows Vista® are registered trademarks of Microsoft Corporation. Macintosh® and Mac OS X® are registered trademarks of Apple Inc., registered in the U.S. and other countries. QUALCOMM® is a registered trademark of QUALCOMM Incorporated. Used under license. Other trademarks are the property of their respective owners. Contact Information Sales Desk: Phone: 1-604-232-1488 Hours: 8:00 AM to 5:00 PM Pacific Time Contact: http://www.sierrawireless.com/sales Post: Sierra Wireless 13811 Wireless Way Richmond, BC Canada V6V 3A4 Technical Support: support@sierrawireless.com RMA Support: repairs@sierrawireless.com Fax: 1-604-231-1109 Web: http://www.sierrawireless.com/ Consult our website for up-to-date product descriptions, documentation, application notes, firmware upgrades, troubleshooting tips, and press releases: www.sierrawireless.com
4116922 Rev 1.1 January 21, 2015 4 Hardware Integration Guide Document History Version Date Updates 1.0 January 21, 2015 Creation based on document 4114188: AirPrime - AR7558 - Hardware Integration Guide - Rev1.0. 1.1 March 9, 2015 Some correction for power tolerance – Rev1.1
4116922 Rev 1.0 January 21, 2015 5 Contents 1. INTRODUCTION ................................................................................................ 11 1.1. General Features ............................................................................................................. 11 2. FUNCTIONAL SPECIFICATIONS ...................................................................... 12 2.1. Modes of Operation ......................................................................................................... 12 2.2. Communications Functions ............................................................................................. 12 2.3. Block Diagram ................................................................................................................. 13 3. HARDWARE SPECIFICATIONS ........................................................................ 14 3.1. Environmental Specifications .......................................................................................... 14 3.2. Electrical Specifications ................................................................................................... 14 3.2.1. Absolute Maximum and ESD Ratings ...................................................................... 14 3.3. Mechanical Specifications ............................................................................................... 15 3.3.1. Physical Dimensions and Connection Interface ....................................................... 15 3.3.2. Mechanical Drawing ................................................................................................. 16 3.3.3. Footprint ................................................................................................................... 17 3.3.4. Thermal Consideration ............................................................................................. 18 4. RF SPECIFICATION .......................................................................................... 19 4.1. LTE RF Interface ............................................................................................................. 19 4.1.1. LTE Max TX Output Power ...................................................................................... 19 4.1.2. LTE RX Sensitivity ................................................................................................... 19 4.2. CDMA RF Interface ......................................................................................................... 19 4.2.1. CDMA Max TX Output Power .................................................................................. 20 4.2.2. CDMA RX Sensitivity ............................................................................................... 20 4.3. WCDMA RF Interface ...................................................................................................... 20 4.3.1. WCDMA Max TX Output Power ............................................................................... 20 4.3.2. WCDMA RX Sensitivity ............................................................................................ 20 4.4. WWAN Antenna Interface ............................................................................................... 21 4.4.1. WWAN Antenna Recommendations ........................................................................ 21 4.5. Primary Antenna Diagnostics .......................................................................................... 22 4.6. RX2 Antenna Diagnostics ............................................................................................... 22 5. GNSS SPECIFICATION ..................................................................................... 24 5.1. GNSS............................................................................................................................... 24 5.2. GNSS Antenna Interface ................................................................................................. 24 5.2.1. GNSS Antenna Recommendations ......................................................................... 25 5.3. GNSS Antenna Diagnostics ............................................................................................ 25 5.4. Current Consumption ...................................................................................................... 27 5.5. Digital IO Characteristics ................................................................................................. 28 5.6. Internal Device Frequencies ............................................................................................ 29
4116922 Rev 1.1 January 21, 2015 6 Hardware Integration Guide 6. BASEBAND SPECIFICATION ........................................................................... 30 6.1. Power Supply .................................................................................................................. 30 6.1.1. Under-Voltage Lockout (UVLO) ............................................................................... 30 6.2. VCOIN ............................................................................................................................. 31 6.3. ON/OFF Control .............................................................................................................. 32 6.3.1. ON/OFF Timing ........................................................................................................ 32 6.3.2. Software-Initiated Power Down ................................................................................ 34 6.3.3. Deep Sleep............................................................................................................... 34 6.3.3.1. Sequence to Enter Deep Sleep Mode ............................................................. 35 6.4. USB ................................................................................................................................. 35 6.5. UART ............................................................................................................................... 36 6.6. Ring Indicator .................................................................................................................. 36 6.7. UIM Interface ................................................................................................................... 37 6.7.1. Internal UIM .............................................................................................................. 37 6.8. General Purpose IO ......................................................................................................... 38 6.8.1. AT Port Switch ......................................................................................................... 38 6.9. Secure Digital IO ............................................................................................................. 38 6.10. I2C .................................................................................................................................... 39 6.11. Voltage Reference ........................................................................................................... 39 6.12. RESET ............................................................................................................................. 39 6.13. ADC ................................................................................................................................. 40 6.14. LED .................................................................................................................................. 41 6.15. Audio................................................................................................................................ 41 6.15.1. Analog Audio ............................................................................................................ 41 6.15.2. Digital Audio ............................................................................................................. 42 6.15.2.1. PCM ............................................................................................................... 42 6.15.2.2. I2S ................................................................................................................. 45 6.16. SPI Bus ............................................................................................................................ 47 6.16.1. Characteristics ......................................................................................................... 47 6.16.2. SPI Configuration ..................................................................................................... 47 6.16.3. SPI Waveforms ........................................................................................................ 47 6.16.4. SPI Pin Description .................................................................................................. 48 6.16.5. Application ................................................................................................................ 48 6.17. HSIC Bus ......................................................................................................................... 49 6.17.1. HSIC Pin Description ............................................................................................... 49 6.17.2. HSIC Waveforms ..................................................................................................... 49 6.17.3. Application ................................................................................................................ 50 6.18. Temperature Monitoring .................................................................................................. 51 7. ROUTING CONSTRAINTS AND RECOMMENDATIONS ................................. 52 7.1. RF Routing Recommendations ....................................................................................... 52 7.2. Power and Ground Recommendations ........................................................................... 54 7.3. Antenna Recommendations ............................................................................................ 54
4116922 Rev 1.1 January 21, 2015 7 Hardware Integration Guide 7.4. Interface Circuit Recommendations ................................................................................ 55 8. REGULATORY INFORMATION ......................................................................... 56 8.1. Important Notice .............................................................................................................. 56 8.2. Safety and Hazards ......................................................................................................... 56 8.3. Important Compliance Information for USA OEM Integrators ......................................... 56 9. REFERENCES ................................................................................................... 59 10. ABBREVIATIONS .............................................................................................. 60
4116922 Rev 1.0 January 21, 2015 8 List of Figures Figure 1. AirPrime AR7558 Block Diagram .................................................................................... 13 Figure 2. AR55x Assembly Drawing ............................................................................................... 16 Figure 3. AirPrime AR7558 Mechanical Dimensions Drawing ....................................................... 16 Figure 4. AirPrime AR7558 Footprint ............................................................................................. 17 Figure 5. AirPrime AR7558 Recommended Application Land Pattern ........................................... 17 Figure 6. AirPrime AR7558 Heatsink Contact Area ....................................................................... 18 Figure 7. VGNSS_ANT vs. ADC Readings Relationship ............................................................... 26 Figure 8. GNSS Power Supply and Antenna Diagnostics Block Diagram ..................................... 27 Figure 9. Under-Voltage Lockout (UVLO) Diagram ........................................................................ 30 Figure 10. Recommended ON/OFF Control ..................................................................................... 32 Figure 11. Alternate ON/OFF Control ............................................................................................... 33 Figure 12. Power Mode Diagram ...................................................................................................... 34 Figure 13. Recommended UIM Holder Implementation ................................................................... 37 Figure 14. Illustration of Reset Timing When RESIN_N < Trdel ...................................................... 40 Figure 15. Illustration of Reset Timing When RESIN_N Held Low > Trdet+Trdel ............................ 40 Figure 16. LED Reference Circuit ..................................................................................................... 41 Figure 17. Audio Block Diagram ....................................................................................................... 41 Figure 18. PCM_FS Timing Diagram (2048 kHz Clock) ................................................................... 43 Figure 19. PCM Codec to AR Device Timing Diagram (Primary PCM) ........................................... 44 Figure 20. AR Device to PCM Codec Timing Diagram (Primary PCM) ........................................... 44 Figure 21. PCM_FS Timing Diagram (128 kHz Clock) ..................................................................... 45 Figure 22. PCM Codec to AR Device Timing Diagram (Auxiliary PCM) .......................................... 45 Figure 23. AR Device to PCM Codec Timing Diagram (Auxiliary PCM) .......................................... 45 Figure 24. I2S Signals Timing Diagram ............................................................................................ 46 Figure 25. 4-Wire Configuration SPI Transfer .................................................................................. 47 Figure 26. Example of 4-wire SPI Bus Application ........................................................................... 48 Figure 27. HSIC Signal Sample Waveforms .................................................................................... 49 Figure 28. Example of HSIC Bus Application ................................................................................... 50 Figure 29. Temperature Monitoring State Machine .......................................................................... 51 Figure 30. AppCAD Screenshot for Microstrip Design Power Mode Diagram ................................. 52 Figure 31. RF Routing Examples ..................................................................................................... 53 Figure 32. Coplanar Clearance Example ......................................................................................... 53 Figure 33. Antenna Microstrip Routing Example .............................................................................. 54 Figure 34. AirPrime AR7558 Input Reference Circuit ....................................................................... 55 Figure 35. AirPrime AR7558 Output Reference Circuit .................................................................... 55
4116922 Rev 1.0 January 21, 2015 9 List of Tables Table 1. AirPrime AR7558 Embedded Module ............................................................................. 11 Table 2. AirPrime AR7558 Modes of Operation ............................................................................ 12 Table 3. Communications Functions ............................................................................................. 12 Table 4. AirPrime AR7558 Environmental Specifications ............................................................. 14 Table 5. AirPrime AR7558 Absolute Maximum Ratings ................................................................ 14 Table 6. AirPrime AR7558 Embedded Module Dimensions ......................................................... 15 Table 7. AirPrime AR7558 Maximum LTE Transmitter Output Power .......................................... 19 Table 8. AirPrime AR7558 Minimum LTE Receiver Sensitivity ..................................................... 19 Table 9. AirPrime AR7558 Maximum CDMA Transmitter Output Power ...................................... 20 Table 10. AirPrime AR7558 Minimum CDMA Receiver Sensitivity ................................................. 20 Table 11. AirPrime AR7558 Maximum WCDMA Transmitter Output Power .................................. 20 Table 12. AirPrime AR7558 Minimum WCDMA Receiver Sensitivity ............................................. 21 Table 13. AirPrime AR7558 WWAN Antenna Characteristics ........................................................ 21 Table 14. WWAN Antenna Interface Pads ...................................................................................... 21 Table 15. AirPrime AR7558 WWAN Antenna Recommendations ................................................. 21 Table 16. Primary Antenna ADC Characteristics ............................................................................ 22 Table 17. Primary Antenna Diagnostics Ranges ............................................................................ 22 Table 18. RX2 Antenna ADC Characteristics.................................................................................. 23 Table 19. RX2 Antenna Diagnostics Ranges .................................................................................. 23 Table 20. GNSS Characteristics ..................................................................................................... 24 Table 21. GNSS Antenna Interface Characteristics ........................................................................ 24 Table 22. GNSS Antenna Interface Pads ........................................................................................ 25 Table 23. GNSS Recommended Antenna Characteristics ............................................................. 25 Table 24. GNSS Antenna Diagnostics Ranges ............................................................................... 25 Table 25. VGNSS_ANT Current Draw ............................................................................................ 26 Table 26. AirPrime AR7558 Current Consumption Values ............................................................. 27 Table 27. Digital IO Characteristics ................................................................................................. 28 Table 28. Internal Device Frequencies ............................................................................................ 29 Table 29. Power Supply Requirements ........................................................................................... 30 Table 30. Power Supply Pads ......................................................................................................... 30 Table 31. UVLO Thresholds ............................................................................................................ 31 Table 32. VCOIN Pad ...................................................................................................................... 31 Table 33. VCOIN Interface Specification ......................................................................................... 31 Table 34. VCOIN Charging Specifications ...................................................................................... 31 Table 35. ON/OFF Control Pads ..................................................................................................... 32 Table 36. ON/OFF Internal Pull-Up ................................................................................................. 32 Table 37. Power-ON Sequence Symbol Definitions ....................................................................... 33
4116922 Rev 1.1 January 21, 2015 10 Hardware Integration Guide Table 38. Period of Wake Intervals ................................................................................................. 34 Table 39. Deep Sleep Function Availability ..................................................................................... 34 Table 40. USB Pad Details .............................................................................................................. 35 Table 41. USB Characteristics ........................................................................................................ 36 Table 42. UART Pads ...................................................................................................................... 36 Table 43. Ring Indicator Pad ........................................................................................................... 36 Table 44. UIM Pads ......................................................................................................................... 37 Table 45. GPIO Interface Pads ....................................................................................................... 38 Table 46. AT Port Switch States ..................................................................................................... 38 Table 47. SDIO Interface Pads ....................................................................................................... 38 Table 48. I2C Interface Pads ........................................................................................................... 39 Table 49. Voltage Reference Pad ................................................................................................... 39 Table 50. Voltage Reference Characteristics .................................................................................. 39 Table 51. Reset Interface Pads ....................................................................................................... 39 Table 52. Reset Timing ................................................................................................................... 40 Table 53. ADC Interface Pads ......................................................................................................... 40 Table 54. ADC Interface Characteristics ......................................................................................... 41 Table 55. LED Interface Pad ........................................................................................................... 41 Table 56. Analog Audio Interface Pads ........................................................................................... 41 Table 57. Analog Audio Interface Characteristics ........................................................................... 42 Table 58. Digital Audio Interface Pads ............................................................................................ 42 Table 59. PCM Interface Configurations ......................................................................................... 42 Table 60. Primary PCM Timing ....................................................................................................... 43 Table 61. Auxiliary PCM Timing ...................................................................................................... 44 Table 62. SPI Configuration ............................................................................................................ 47 Table 63. SPI Master Timing Characteristics .................................................................................. 48 Table 64. SPI Pin Description ......................................................................................................... 48 Table 65. HSIC Pin Description ....................................................................................................... 49 Table 66. Temperature Monitoring States ....................................................................................... 51 Table 67. Reference Specifications ................................................................................................. 59 Table 68. Abbreviations ................................................................................................................... 60
4116922 Rev 1.0 January 21, 2015 11 1. Introduction 1.1. General Features The AirPrime AR7558 embedded modules are designed for the automotive industry. They support LTE, CDMA, WCDMA air interface standards and shares hardware and firmware interfaces with the AirPrime AR5550 and AR855x. They also have Global Navigation Satellite System (GNSS) capabilities including GPS and GLONASS. The AirPrime AR7558 embedded modules are based on the Qualcomm MDM9615 wireless chipset and support the following bands. Table 1. AirPrime AR7558 Embedded Module Product Description Band Support AirPrime AR7558 LTE/CDMA2000/WCDMA/GSM embedded module LTE: B4, B25, B26,B41 CDMA: BC0, BC1,BC10 WCDMA: B2, B5 GSM/GPRS/EDGE: 850/1900
4116922 Rev 1.0 January 21, 2015 12 2. Functional Specifications This chapter highlights the features of the AirPrime AR7558 series of embedded modules. 2.1. Modes of Operation The AirPrime AR7558 supports 2G/3G/4G operations and also supports GNSS operation. For complete details, refer to the table below. Table 2. AirPrime AR7558 Modes of Operation Mode Band Frequency (MHz) Downlink (DL) UE Receive Uplink (UL) UE Transmit LTE Band 4 2110 MHz to 2155 MHz 1710 MHz to 1755 MHz Band 25 1930 to 1995 1850 to 1915 Band 26 859 to 894 814 to 849 Band 41 2496 to 2690 2496 to 2690 CDMA2000 – 1xRTT & 1xEVDO Band Class 0 869 to 894 824 to 849 Band Class 1 1930 to 1990 1850 to 1910 Band Class 10 861 to 868.975 816 to 823.975 WCDMA/HSPA II (1900/PCS) 1930 MHz to 1990 MHz 1850 MHz to 1910 MHz V (850/CELL) 869 MHz to 894 MHz 824 MHz to 849 MHz GSM/GPRS /EDGE GSM 850 869 to 894 824 to 849 PCS 1900 1930 to 1990 1850 to 1910 2.2. Communications Functions The AirPrime AR7558 provides the following communications functions via the LTE, CDMA and UMTS networks. Table 3. Communications Functions Communications Function LTE CDMA WCDMA TDSCDMA GSM/GPRS/EDGE Voice Circuit Switched EVRC, EVRC-B AMR, AMR-WB AMR FR, EFR, HR VoLTE  Packet Data      Short Message Service (SMS)      OTA OTAPA   OTASP   DTMF (TBD)    
4116922 Rev 1.1 January 21, 2015 13 Hardware Integration Guide Functional Specifications 2.3. Block Diagram Figure 1. AirPrime AR7558 Block Diagram
4116922 Rev 1.0 January 21, 2015 14 3. Hardware Specifications 3.1. Environmental Specifications The environmental specification for both operating and storage of the AirPrime AR7558 embedded modules are defined in the table below. Table 4. AirPrime AR7558 Environmental Specifications Parameter Temperature Range Operating Class Ambient Operating Temperature -30°C to +75°C Class A -40°C to -30°C +75°C to +85°C Class B Ambient Storage Temperature -40°C to +90°C --- Ambient Humidity 95% or less --- Class A is defined as the operating temperature range that the device:  Shall exhibit normal function during and after environmental exposure.  Shall meet the minimum requirements of 3GPP, 3GPP2 or appropriate wireless standards. Class B is defined as the operating temperature range that the device:  Shall remain fully functional during and after environmental exposure  Shall exhibit the ability to establish a voice, SMS or DATA call (emergency call) at all times even when one or more environmental constraint exceeds the specified tolerance.  Unless otherwise stated, full performance should return to normal after the excessive constraint(s) have been removed. 3.2. Electrical Specifications This section provides details for some of the key electrical specifications of the AirPrime AR7558 embedded modules. 3.2.1. Absolute Maximum and ESD Ratings This section defines the Absolute Maximum and Electrostatic Discharge (ESD) Ratings of the AirPrime AR7558 embedded modules. Warning: If these parameters are exceeded, even momentarily, damage may occur to the device. Table 5. AirPrime AR7558 Absolute Maximum Ratings Parameter Min Max Units VBATT Power Supply Input - 5.0 V VIN Voltage on any digital input or output pin - VCC_1v8+0.5 V IIN Latch-up current -100 100 mA
4116922 Rev 1.1 January 21, 2015 15 Hardware Integration Guide Hardware Specifications Parameter Min Max Units Maximum Voltage applied to antenna interface pins VANT Primary Antenna - 36 V RX2 Antenna - 36 V GNSS Antenna - 36 V ESD Ratings ESD1 Primary, RX2 and GNSS antenna pads - Contact - ± 8 kV All other signal pads - Contact - ± 1.5 kV 1 The ESD Simulator configured with 330pF, 1000Ω. Caution: The AirPrime AR7558 embedded modules are sensitive to Electrostatic Discharge. ESD countermeasures and handling methods must be used when handling the AirPrime AR7558 devices. 3.3. Mechanical Specifications 3.3.1. Physical Dimensions and Connection Interface The AirPrime AR7558 embedded modules are a Land Grid Array (LGA) form factor device. The device does not have a System or RF connectors. All electrical and mechanical connections are made via the 303 pad LGA on the underside of the PCB. Table 6. AirPrime AR7558 Embedded Module Dimensions Parameter Nominal Max Units Overall Dimension 32 x 37 32.25 x 37.25 mm Overall Module Height 3.64 3.89 mm PCB Thickness 1.6 1.76 mm Flatness Specification - 0.1 mm Weight tbd - g Note: The dimensions in this document’s figures are accurate as of the release date of this document.
4116922 Rev 1.1 January 21, 2015 16 Hardware Integration Guide Hardware Specifications 3.3.2. Mechanical Drawing Figure 2. AR55x Assembly Drawing Figure 3. AirPrime AR7558 Mechanical Dimensions Drawing Note: The dimensions in this document’s figures are preliminary and subject to change.
4116922 Rev 1.1 January 21, 2015 17 Hardware Integration Guide Hardware Specifications 3.3.3. Footprint The AirPrime AR7558 device LGA footprint is a 303 pad array of 0.9mm, 1.45mm, and 1.90mm pads. The following drawing illustrates the device footprint. The application footprint is recommended to mirror the device footprint as illustrated in the following drawing (subject to change). Figure 4. AirPrime AR7558 Footprint Figure 5. AirPrime AR7558 Recommended Application Land Pattern
4116922 Rev 1.1 January 21, 2015 18 Hardware Integration Guide Hardware Specifications 3.3.4. Thermal Consideration The AirPrime AR7558 device is designed to work over an extended temperature range. In order to do this efficiently a method of sinking heat from the product is recommended. Refer to application notes (TBD) for details. Figure 6. AirPrime AR7558 Heatsink Contact Area
4116922 Rev 1.0 January 21, 2015 19 4. RF Specification This section presents the WWAN RF interface of the AirPrime AR7558 series of embedded modules. The specifications for the LTE, CDMA and WCDMA interfaces are defined. 4.1. LTE RF Interface This section presents the LTE RF Specification for the AirPrime AR7558. 4.1.1. LTE Max TX Output Power The Maximum Transmitter Output Power of the AirPrime AR7558 embedded modules are specified in the following table. Table 7. AirPrime AR7558 Maximum LTE Transmitter Output Power Band Frequency Band (MHz) Nominal Max TX Output Power Tolerance Band 4 2110 MHz to 2155 MHz +23 dB +2/-2 dB Band 25 1930 to 1995 Band 26 859 to 894 Band 41 2496 to 2690 +22.5 dB +3.2/-1.7 4.1.2. LTE RX Sensitivity The Minimum Receiver Sensitivity of the AirPrime AR7558 embedded modules are specified in the following table. Table 8. AirPrime AR7558 Minimum LTE Receiver Sensitivity Band Frequency Band (MHz) Minimum RX Downlink Criteria Band 4 1710 MHz to 1755 MHz tbd tbd Band 25 1850 to 1915 tbd tbd Band 26 814 to 849 tbd tbd Band 41 2496 to 2690 tbd tbd 4.2. CDMA RF Interface This section presents the CDMA RF Specification for the AirPrime AR7558 embedded modules. AirPrime AR7558 devices are designed to be compliant with 3GPP2 C.S0011 Rev A and 3GPP2 C.S0033 Rev A v1.0. Parameters specified differently for the reference standard are identified below.
4116922 Rev 1.1 January 21, 2015 20 Hardware Integration Guide RF Specification 4.2.1. CDMA Max TX Output Power The Maximum Transmitter Output Power of the AirPrime AR7558 embedded module is specified in the following table. Table 9. AirPrime AR7558 Maximum CDMA Transmitter Output Power Band Class Frequency Band Nominal Max TX Output Power Tolerance BC0 800 MHz +24 dBm ±1 dB BC1 1900 MHz BC10 800 MHz 4.2.2. CDMA RX Sensitivity The Minimum Receiver Sensitivity of the AirPrime AR7558 embedded module is specified in the following table. Table 10. AirPrime AR7558 Minimum CDMA Receiver Sensitivity Band Class Frequency Band Minimum RX downlink Criteria BC0 800 MHz -106 dBm (Class A) -104 dBm (Class B) Less than 0.5% FER BC1 1900 MHz 4.3. WCDMA RF Interface This section presents the WCDMA RF Specification for the AirPrime AirPrime AR7558 embedded modules. 4.3.1. WCDMA Max TX Output Power The Maximum Transmitter Output Power of the AirPrime AR7558 embedded module are specified in the following table. Table 11. AirPrime AR7558 Maximum WCDMA Transmitter Output Power Band Frequency Band Nominal Max TX Output Power Tolerance II (1900/PCS) 1850 MHz to 1910 MHz +23.5 dBm +2.2/-2.7 dB V (850/CELL) 824 MHz to 849 MHz 4.3.2. WCDMA RX Sensitivity The Minimum Receiver Sensitivity of the AirPrime AR7558 embedded module are specified in the following table.
4116922 Rev 1.1 January 21, 2015 21 Hardware Integration Guide RF Specification Table 12. AirPrime AR7558 Minimum WCDMA Receiver Sensitivity Band Frequency Band Minimum RX Downlink Criteria II (1900/PCS) 1930 MHz to 1990 MHz -106 dBm (Class A) -105 dBm (Class B) BER < 0.001 V (850/CELL) 869 MHz to 894 MHz -107 dBm (Class A) -106 dBm (Class B) 4.4. WWAN Antenna Interface The specification for the WWAN Antenna Interface of the AirPrime AR7558 embedded modules are defined in the table below. Table 13. AirPrime AR7558 WWAN Antenna Characteristics Characteristics CDMA BC0, BC10,WCDMA B5 CDMA BC1, WCDMA B2 LTE B4 LTE B25 LTE B26 LTE B41 Frequency (MHz) TX 824-849 1850-1910 1710 – 1755 1850 – 1915 814-849 2496-2690 RX 869-894 1930-1990 2110 – 2155 1930 –1995 859-894 2496-2690 Impedance RF 50 Ω VSWR max RX 2:1 TX 2:1 Maximum Voltage Primary Antenna – 36 Volts RX2 Antenna – 36 Volts (LTE MIMO: tbd) Note: RX2 Antenna port is RX only, RX parameters in the above tables are also applicable. Table 14. WWAN Antenna Interface Pads Pad Name Direction Function BA11 GND Primary Antenna Ground BA12 PRIMARY_ANT Input/Output Primary Antenna Interface BA13 GND Primary Antenna Ground BA7 GND Diversity Antenna Ground BA8 DIVERSITY_ANT Input Diversity Antenna Interface BA9 GND Diversity Antenna Ground 4.4.1. WWAN Antenna Recommendations The table below defines the key characteristics to consider for antenna selection. Table 15. AirPrime AR7558 WWAN Antenna Recommendations Characteristics CDMA BC0, WCDMA B5 CDMA BC1, WCDMA B2 LTE B4 LTE B13 Frequency (MHz) TX 824-849 1850-1910 1710 – 1755 777 – 787
4116922 Rev 1.1 January 21, 2015 22 Hardware Integration Guide RF Specification Characteristics CDMA BC0, WCDMA B5 CDMA BC1, WCDMA B2 LTE B4 LTE B13 RX 869-894 1930-1990 2110 – 2155 746 – 756 Impedance RF 50 Ω DC 10 kΩ ±1k VSWR max RX 1.5: 1 TX 1.5: 1 Polarization Linear, vertical Typical radiated gain 0 dBi in one direction at least 4.5. Primary Antenna Diagnostics The primary antenna diagnostic feature allows the AirPrime AR7558 embedded module to determine if the primary antenna connected to the module is: open, shorted or normal. The antenna connected to this interface needs to have a DC resistance to ground of 10 kΩ ± 1k embedded inside. The ARx55x FW accepts two limits which are used to evaluate the status of the antenna, representing the short and open thresholds. Refer to document [7] for the syntax of AT+ANTLIMT. Table 16. Primary Antenna ADC Characteristics Min Nom Max Units ADC Voltage Range 0 0.9 1.8 Volts Resolution - 15 Bit ADC Values 0 16383 Voltage/ADC step ~0.0011 Volts 1 Assumes 10kΩ Nominal DC resistance in the attached antenna and internal to AirPrime AR7558 device The following example illustrates the Antenna states and resistance values for a typical limit setting. AT+ANTLIMT=1,839,1088 Table 17. Primary Antenna Diagnostics Ranges Antenna State Min ADC Max ADC Antenna Resistance Range Short 0 839 ~ ≤ 7 kΩ Normal 841 1086 7 kΩ < x < 13 kΩ Open 1088 1900 ≥ 13 kΩ Note: Highlighted numbers in the table above are programmed as shortLim and openLim using the +ANTLIMT command. 4.6. RX2 Antenna Diagnostics The RX2 antenna diagnostic feature allows the AirPrime AR75580 to determine if the RX2 antenna connected to the module is: open, shorted or normal. The antenna connected to this interface needs to have a DC resistance to ground of 10 kΩ ± 1k embedded inside.
4116922 Rev 1.1 January 21, 2015 23 Hardware Integration Guide RF Specification The AirPrime AR7558 FW accepts two limits which are used to evaluate the status of the antenna, representing the short and open thresholds. Refer to document [7] for the syntax of AT+ANTLIMT. Table 18. RX2 Antenna ADC Characteristics Min Nom Max Units ADC Voltage Range 0 0.9 1.8 Volts Resolution - 15 Bit ADC Values 0 16383 Voltage/ADC step ~0.0011 Volts 1 Assumes 10kΩ Nominal DC resistance in the attached antenna and internal to AirPrime AR7558 device The following example illustrates the Antenna states and resistance values for a typical limit setting. AT+ANTLIMT=2,839,1088 Table 19. RX2 Antenna Diagnostics Ranges Antenna State Min ADC Max ADC Antenna Resistance Range Short 0 839 ~ ≤ 7 kΩ Normal 841 1086 7 kΩ < x < 13 kΩ Open 1088 1900 ≥ 13 kΩ Note: Highlighted numbers in the table above are programmed as shortLim and openLim using the +ANTLIMT command.
4116922 Rev 1.0 January 21, 2015 24 5. GNSS Specification The AirPrime AR7558 embedded module includes optional Global Navigation Satellite System (GNSS) capabilities via the Qualcomm gpsOne Gen8 Engine, capable of operation in assisted and stand-alone GPS modes as well as GPS+GLONASS mode. 5.1. GNSS The GNSS implementation supports GPS L1 operation and GLONASS L1 FDMA operation. Table 20. GNSS Characteristics Parameter Value Sensitivity Standalone or MS Based Tracking Sensitivity tbd Cold Start Sensitivity tbd MS Assisted Synchronous A-GNSS Acquisition Sensitivity tbd Accuracy in Open Sky (1 Hz tracking) < 2m CEP-50 Total number of SV available ~30 SVs Support for Predicted Orbits Yes Predicted Orbit CEP-50 Accuracy 5 m Standalone Time To First Fix (TTFF) Super Hot 1 s Warm 29 s Cold 32 s Number of channels tbd GNSS Message Protocols NMEA Note: Acquisition/Tracking Sensitivity performance figures assume open sky w/ active patch GNSS antenna and a 2.5 dB Noise Figure. 5.2. GNSS Antenna Interface The specification for GNSS Antenna Interface is defined in the table below. The AirPrime AR7558 provides biasing for an active antenna as well as onboard circuitry for diagnostics of this antenna interface. Table 21. GNSS Antenna Interface Characteristics Characteristics GNSS Frequency GPS L1 (Wideband) 1575.42 ± 20 MHz Glonass L1 FDMA 1597.5 – 1605.8 MHz RF Impedance 50 Ω VSWR max RX 2:1 LNA Bias Voltage 4.4 – 4.9V, 5.25V (No Load) LNA Current Consumption 50 mA Max Maximum Voltage applied to antenna 36 Volts
4116922 Rev 1.1 January 21, 2015 25 Hardware Integration Guide GNSS Specification Minimum isolation between the GNSS and WWAN Antenna must be 10 dB for the AirPrime AR7558. Table 22. GNSS Antenna Interface Pads Pad Name Direction Function BA4 GND GNSS Antenna Ground BA5 GNSS_ANT Input GNSS Antenna Interface BA6 GND GNSS Antenna Ground 5.2.1. GNSS Antenna Recommendations The table below defines the key characteristics to consider for antenna selection. Table 23. GNSS Recommended Antenna Characteristics Characteristics GNSS Frequency GPS L1 (Wideband) 1575.42 ± 20 MHz Glonass L1 FDMA 1597.5 – 1605.8 MHz RF Impedance 50 Ω VSWR max RX 1.5: 1 LNA Bias Voltage 4.4 – 4.9V LNA Noise Figure 2.0 dB Max LNA Current Consumption 50 mA Max Antenna System Gain (Antenna + LNA - Cable) 20 – 24 dB Polarization Right Hand Circular Polarization 5.3. GNSS Antenna Diagnostics The GNSS Antenna Diagnostic feature measures the current drawn by an active GNSS antenna to determine the state of this antenna interface. Based on the current draw an assessment of open, short, normal or over-current is made. If an over-current is detected, the bias for the active antenna is removed to eliminate the fault for drawing excess current which could potentially damage the antenna. The limits between open/normal and normal/short can be set by the application through an AT Command. ADC Value < openLim < > shortLim > GNSS Antenna State Open Normal Short The Over Current limit is set by hardware and cannot be altered. Table 24. GNSS Antenna Diagnostics Ranges Control State Min Max Units HW Over Current 78 100 mA The GNSS antenna supply is powered from VBATT through a boost regulator.
4116922 Rev 1.1 January 21, 2015 26 Hardware Integration Guide GNSS Specification The following table identifies some key VGNSS_ANT current draw values and the associated ADC values. Table 25. VGNSS_ANT Current Draw I (mA) Nominal 0 337 5 612 10 936 15 1242 20 1558 25 1877 30 2194 35 2494 40 2821 45 3188 50 3444 55 3747 60 4065 65 4292 70 4319 The graph below illustrates the relationship between current drawn on VGNSS_ANT vs the ADC readings used to monitor the GNSS Antenna status. Figure 7. VGNSS_ANT vs. ADC Readings Relationship
4116922 Rev 1.1 January 21, 2015 27 Hardware Integration Guide GNSS Specification PM8018150KBOOST REGVIN VOUTFBBOOST_CTRL200V/V ConverterS+ S-VoutPMICMPP_02MDM9X15GPIO_09GPIO_69 LGAVBATT 330mI LimVIN VOUTFLAGBONGPIO_5910KGNSSPWR_ENILIM_ENILIM_OC_NVGNSS5VCurrent Limit=75mA0~4.35VGNSS_ANT_ADC5V Figure 8. GNSS Power Supply and Antenna Diagnostics Block Diagram 5.4. Current Consumption The table below summarizes some key current consumption values for various modes of the AirPrime AR7558 devices. Table 26. AirPrime AR7558 Current Consumption Values Mode Parameter Typical Max Units On Call – CDMA Maximum TX Output – 1xRTT/1xEVDO - tbd mA +0dBm TX Output – 1xRTT tbd - mA +0dBm TX Output – 1xEVDO tbd - mA On Call – WCDMA Maximum TX Output – WCDMA/HSPA - tbd mA +0dBm TX Output – WCDMA tbd - mA +0dBm TX Output – HSPA tbd - mA On Call – LTE Maximum TX Output - tbd mA +0dBm TX Output tbd - mA Idle – CDMA Registered USB Enumerated tbd - mA USB Not Enumerated tbd - mA Searching for network – CDMA tbd - mA Idle – WCDMA Registered USB Enumerated tbd - mA USB Not Enumerated tbd - mA Searching for network – WCDMA tbd - mA
4116922 Rev 1.1 January 21, 2015 28 Hardware Integration Guide GNSS Specification Mode Parameter Typical Max Units Idle – LTE Registered USB Enumerated tbd - mA USB Not Enumerated tbd - mA Searching for network – LTE tbd - mA Sleep Mode Average current, QPCH, SCI=2 - tbd mA Average current, WCDMA, DRX=8 - tbd mA Average current, LTE - tbd mA Off Power OFF Current tbd tbd μA GNSS Acquisition (Airplane mode, cold start) tbd mA Tracking (Registered) tbd mA Powering an Active Antenna from VGNSS_ANT tbd mA 1 This is the additional current draw on VBATT for 10mA consumption by Active LNA from VGNSS_ANT. Higher current consumption by the antenna will result in higher consumption on VBATT. 5.5. Digital IO Characteristics The Digital IO characteristics are defined in the table below. These apply to GPIOs, UART, LED, SDIO and PCM/I2S. Table 27. Digital IO Characteristics Parameter Comments Min Typ Max Units VIH High level input voltage CMOS/Schmitt 0.65* VCC_1V8 – VCC_1V8+0.3 V VIL Low level input voltage CMOS/Schmitt -0.3 – 0.35* VCC_1V8 V VOH High level output voltage CMOS, at pin rated drive strength VCC_1V8 - 0.45 – VCC_1V8 V VOL Low-level output voltage CMOS, at pin rated drive strength 0 – 0.45 V IOH High level output current VOH = VCC_1V8 – 0.45 V – – 6 mA IOL Low Level output current VOL = 0.45 V -6 – – mA IOH-LED High level output current LED signal only – – – mA IOL-LED Low Level output current LED signal only -3 – 20 mA IIHPD Input high leakage current With pull-down 5 30 µA IILPU Input low leakage current With pull-up -30 -5 µA IL Input leakage current VIO = max, VIN = 0 V to VIO LED signal only -0.3 – +0.35 µA CIN Input capacitance – – 7 pF
4116922 Rev 1.1 January 21, 2015 29 Hardware Integration Guide GNSS Specification Parameter Comments Min Typ Max Units CIN-LED Input capacitance LED signal only – – 5 pF Caution: Digital IOs shall not be pulled-up to an external voltage as this may cause VCC_1V8 to not go low when the AirPrime AR7558 device is powered down. Also, this would partially bias the AirPrime AR7558 device which could potentially damage the device or result in GPIOs being set to undetermined levels. 5.6. Internal Device Frequencies The table below summarizes the frequencies generated within the AirPrime AR7558. This table is provided for reference only to the device integrator. Table 28. Internal Device Frequencies Subsystem/Feature Frequency Units Real Time Clock 32.768 kHz PCM Audio interface (Primary PCM Master Mode) [TBD] 8, 128, 2048 kHz I2C Interface 400 kHz PMIC switching power supplies tbd MHz GNSS Antenna bias switching supply 3.5 MHz Fundamental clock, codec, TCXO_OUT 19.2 MHz PLL tbd MHz USB 12, 480 Mb/s
4116922 Rev 1.0 January 21, 2015 30 6. Baseband Specification 6.1. Power Supply The AirPrime AR7558 embedded module is powered via a single regulated DC power supply, 3.7V nominal. The power supply requirements can be found in the following table. Table 29. Power Supply Requirements Power Supply Min Typ Max Units Main DC Power Input Range 3.4 3.7 4.2 V Power Supply Ripple 0 to 1kHz - - 200 mVpp >1kHz - - 50 mVpp Maximum Current draw AR7558 - - tbd mA AirPrime AR7558 does not support USB bus-powered operation. DC power must be supplied via the VBATT input. Table 30. Power Supply Pads Pad Name Direction Function If Unused EA2 VBATT Input Power Supply Input Must Be Used EB2 VBATT Input Power Supply Input Must Be Used EC2 VBATT Input Power Supply Input Must Be Used 6.1.1. Under-Voltage Lockout (UVLO) The power management section of the AirPrime AR7558 includes an under-voltage lockout circuit that monitors supply and shuts down when VBATT falls below the threshold. Figure 9. Under-Voltage Lockout (UVLO) Diagram The AirPrime AR7558 will power down and remain off until the level of VBATT returns to the valid range and the ON/OFF signal is active.
4116922 Rev 1.1 January 21, 2015 31 Hardware Integration Guide Baseband Specification Note: If the AirPrime AR7558 device has 6 UVLO events without a valid power down or reset sequence, it enters a mode in which only the DM port enumerates on the USB. Table 31. UVLO Thresholds Description Value Units UVLO Rising threshold 2.725 V Falling threshold 2.55 V Minimum Duration below Falling threshold 1.0 uS 6.2. VCOIN The AirPrime AR7558 provides an interface for a coin cell to maintain the internal RTC when VBATT is removed from the AirPrime AR7558 device. Whenever VBATT is applied the RTC is powered from the VBATT supply. The AirPrime AR7558 also supports charging of a coin cell if connected to this interface. Table 32. VCOIN Pad Pad Name Direction Function If Unused AC11 VCOIN Input /Output Voltage Input/Charging output Leave Open The table below defines the specifications of this interface. Table 33. VCOIN Interface Specification VCOIN Min Typ Max Units DC Power Input Range TBD TBD TBD V Current Draw 1.1 2.0 μA The table below defines the VCOIN charging specifications. Table 34. VCOIN Charging Specifications VCOIN Charging Specs Comments Min Typ Max Units Target regulator voltage1 VIN > 2.5 V, ICHG = 100 μA TBD TBD TBD V Target series resistance2 800 – 2100 Ω Coin cell charger voltage error ICHG = 0 μA -5 – +5 % Coin cell charger resistor error -20 – +20 % Dropout voltage3 ICHG = 2 mA – – 200 mV Ground current, charger enabled VBAT = 3.6 V, T = 27 ºC VBAT = 3.2 to 4.2 V IC = off; VCOIN = open – – 4.5 – – 8 μA μA 1. Valid regulator voltage settings are 2.5, 3.0, 3.1, and 3.2 V. 2. Valid series resistor settings are 800, 1200, 1700, and 2100 Ω. 3. Set the input voltage (VBAT) to 3.5 V. Note the charger output voltage; call this value V0. Decrease the input voltage until the regulated output voltage drops 100 mV (until the charger output voltage = V0 - 0.1 V). The voltage drop across the regulator under this condition is the dropout voltage (Vdropout = VBAT - the charger output voltage).
4116922 Rev 1.1 January 21, 2015 32 Hardware Integration Guide Baseband Specification 6.3. ON/OFF Control The AirPrime AR7558 provides an interface for controlling the device ON/OFF state. Table 35. ON/OFF Control Pads Pad Name Direction Function If Unused BB1 ON/OFF Input ON/OFF Control Must Be Used The ON/OFF signal is internally pulled up to an internal 1.8V reference voltage. An open drain transistor should be connected to this pin to generate a low pulse. This pin should not be driven high external to the AirPrime AR7558 embedded module. Table 36. ON/OFF Internal Pull-Up Signal Parameter Min Typ Max Units ON/OFF Internal Pull-up - 200 - kΩ 6.3.1. ON/OFF Timing The ON/OFF pin is a low pulse toggle control. The first pulse powers the AirPrime AR7558 ON, a second pulse instructs the AirPrime AR7558 to begin the Shutdown process. The diagram below illustrates the recommended application implementation for ON/OFF control. VCC_1V8ON/OFFPower ON PulsetONPower OFF PulsetpwrrmvVBATTtOFFtpwroff Figure 10. Recommended ON/OFF Control The diagram below illustrates an alternate application implementation that holds ON/OFF low during operation.
4116922 Rev 1.1 January 21, 2015 33 Hardware Integration Guide Baseband Specification ON/OFFPower ON TransitionVCC_1V8tpwrrmvVBATTtpwroffPower OFF PulsetHI tOFF Figure 11. Alternate ON/OFF Control Table 37. Power-ON Sequence Symbol Definitions Symbol Parameter Boot Min Typ Max tON Turn ON Pulse duration 50 ms 100 ms ∞ tOFF Turn OFF Pulse duration 50 ms 100 ms 500 ms tpwroff Time to Power OFF - 5 s - tpwrrmv Time VBATT must be maintained after VCC_1V8 goes inactive 0 s - - tHI Time required for ON/OFF to be high prior to OFF pulse. In process 10 s - Complete 50 ms Tpwroff is the time between when a power OFF pulse is complete and when shutdown is completed by the AirPrime AR7558 devices. This duration is network and device dependent, i.e. in a CDMA network a power down registration is initiated by the AirPrime AR7558 device, when the acknowledgement is received from the network power OFF completes. Detection of power down can be accomplished by monitoring for one of the following:  +WIND: 10 output on the AT Command interface  USB ports are de-enumerated The application must wait for a power down to be detected prior to removing power from the AirPrime AR7558 device. If a timeout is required, it is recommended to be in excess of 30s prior to removing power from the AirPrime AR7558 device. Note: Refer to document [7] for details on enabling the +WIND message for power down and +USLGRPMSK and +USLEVTMSK for unsolicited message output.
4116922 Rev 1.1 January 21, 2015 34 Hardware Integration Guide Baseband Specification 6.3.2. Software-Initiated Power Down The host application may choose to use the AT Command AT!POWERDOWN to initiate a power down of the AirPrime AR7558 device instead of using an OFF pulse. In this scenario the ON/OFF signal should be left open by the application. The AirPrime AR7558 device will initiate a power up after completion of the power down if ON/OFF is low. 6.3.3. Deep Sleep The AirPrime AR7558 embedded modules support a low power mode in which the device is registered on the LTE/CDMA/GSM/WCDMA network and sleeps in between wake intervals where it listens for pages. Figure 12. Power Mode Diagram The following table lists the parameter that defines the wake interval period for the various devices. Table 38. Period of Wake Intervals AR Series Device Network Standard Parameter AR7558 CDMA SCI WCDMA DRX LTE DRX The average current consumption of the AirPrime AR7558 while in this mode is defined in the Sleep Mode portion of the current consumption tables in section 5.4 Current Consumption. The Slot Cycle Index is the lower of the values stored in the AirPrime AR7558 or the value being broadcast by the wireless network that the AirPrime AR7558 is registered on. The MFRM and DRX cycle index values are broadcast by the wireless network on which the AirPrime AR7558 embedded module is registered. While in Deep Sleep mode the functions of the AirPrime AR7558 are limited as defined in the following table. Table 39. Deep Sleep Function Availability Function Availability Conditions Paging 
4116922 Rev 1.1 January 21, 2015 35 Hardware Integration Guide Baseband Specification Function Availability Conditions GNSS - GNSS is powered down Time measurement  USB - USB_VBUS is not applied UART - Digital IO - Digital IO pins maintained last state Events that cause the AirPrime AR7558 to wake-up from Deep Sleep mode include:  Incoming call  Expiration of an internal timer in the AirPrime AR7558  USB_VBUS is applied to the AirPrime AR7558  WAKE_N is asserted (low)  UART1 DTR is asserted (high) if UART1 DTR has been enabled as a sleep control (AT+W32K=1,1) and AT Command Service is mapped to UART1  GNSS location fix request is initiated from an Embedded Application See the Ring Indicator section for more information about configuring the RI signal to notify an external application of a wake-up event while the AR device is in sleep mode. 6.3.3.1. Sequence to Enter Deep Sleep Mode The following list defines the sequence needed by the application to allow the AirPrime AR7558 to enter Deep Sleep mode: 1. AR7558 has registered on the WWAN network (or callbox), and is not in a call. 2. End GNSS Tracking session. 3. Turn off GNSS Antenna bias. 4. Confirm WAKE_N is not held low (pulled-up in AirPrime AR7558). 5. Issue AT command to request AR device to enter deep sleep (AT+W32K=1,x). 6. If AT+W32K=1,1 is used, DTR must also be de-asserted to allow sleep. 7. Ensure UARTs are in the inactive state. 8. Remove VBUS from being applied to the AR device. 6.4. USB The AirPrime AR7558 has a High Speed USB2.0 compliant, peripheral only interface. Table 40. USB Pad Details Pad Name Direction Function DA7 USB_VBUS Input USB Power Supply DB6 USB_D_P In/Out Differential data interface positive DA6 USB_D_M In/Out Differential data interface negative DD5 USB_ID In/Out USB ID The AR7558 will not be damaged if a valid USB_VBUS is supplied while the main DC power is not supplied.
4116922 Rev 1.1 January 21, 2015 36 Hardware Integration Guide Baseband Specification Table 41. USB Characteristics USB Value Units USB_VBUS Voltage range 2.0 – 5.25 V Maximum Current draw1 1 mA Maximum Input Capacitance (Min ESR = 50 mΩ) 10 μF 1 With the AirPrime AR7558 device powered ON. 6.5. UART The AirPrime AR7558 has two UART interfaces. The primary UART is an 8-wire1 electrical interface and the secondary UART is a 2-wire electrical interface. Table 42. UART Pads Pad Name Direction Function Interface If Unused AD9 RXD1 Output Receive Data (UART1) UART1 Leave Open AE6 RTS1 Input Ready To Send (UART1) UART1 Leave Open1 AD8 TXD1 Input Transmit Data (UART1) UART1 Leave Open AE7 CTS1 Output Clear To Send (UART1) UART1 Leave Open AF6 DCD1 Output Data Carrier Detect (UART1) UART1 Leave Open AE5 DTR1 Input Data Terminal Ready (UART1) UART1 Leave Open AF5 DSR1 Output Data Set Ready (UART1) UART1 Leave Open DB2 RXD2 Output UART2 Receive Data UART2 Leave Open DA2 TXD2 Input UART2 Transmit Data UART2 Leave Open 1 If UART1 is implemented as a 2-wire interface, RTS1 should be pulled low to disable flow control. 6.6. Ring Indicator The Ring Indicator (RI) may be used to notify an external application of several events such as an incoming call, timer expiration or incoming SMS. Table 43. Ring Indicator Pad Pad Name Direction Function If Unused AD7 RI1 Output Ring Indicator Leave Open The events which toggle the RI signal can be configured using the AT+WWAKESET command. The duration of the RI pulse can be configured using the AT+WRID command. The reason for the RI signal being activated can be queried using the AT+WWAKE command. Refer to document [7] for details of these AT Commands. The RI signal is independent of the UART. 1 Includes Ring Indicator which may also be used independently of UART1.
4116922 Rev 1.1 January 21, 2015 37 Hardware Integration Guide Baseband Specification 6.7. UIM Interface The UIM interface of the AirPrime AR7558 supports a USIM/CSIM for LTE, WCDMA, GSM and CDMA. The UIM can be embedded internally in AR7558 and can be external to AR7558. Table 44. UIM Pads Pad Name Direction Function If Unused DA5 UIM_DETECT Input Detection of an external UIM card Leave Open DB4 UIM_VCC Output Supply output for an external UIM card Leave Open DC3 UIM_RST Output Reset output to an external UIM card Leave Open DA4 UIM_DAT Input /Output Data connection with an external UIM card Leave Open DE1 UIM_CLK Output Clock output to an external UIM card Leave Open The diagram below illustrates the recommended implementation of a UIM holder on the application. Figure 13. Recommended UIM Holder Implementation UIM_DETECT is used to detect the physical presence of a SIM/UIM card in the holder. It has a 3.0uA to 30µA pull-up to 1.8V inside the AirPrime AR7558. It should be set to GND if a SIM/UIM is present. All signals must be ESD-protected near the UIM holder. The capacitor and two resistors should be added as placeholders to compensate for potential layout issues. UIM_DAT trace should be routed away from the UIM_CLK trace. Keep distance from AirPrime AR7558 to UIM-Holder as short as possible. An ESD device specifically designed for SIM/UIM cards is recommended for UIM_VCC, UIM_RST, UIM_CLK and UIM_DAT. i.e. SEMTECH EClamp2455K, Infineon BGF106C or NXP IP4264CZ8-20-TTL. For UIM_DETECT a low leakage ESD suppressor should be selected. 6.7.1. Internal UIM Alternatively, a hardware option is available that includes a UIM device mounted on the AirPrime AR7558 PCB thus eliminating the need for an external UIM holder
4116922 Rev 1.1 January 21, 2015 38 Hardware Integration Guide Baseband Specification 6.8. General Purpose IO The AirPrime AR7558 defines 10 GPIOs for customer use. Table 45. GPIO Interface Pads Pad Name Pull State Function If Unused Multiplexed Function CA10 GPIO1 Pull-Down Available-GPIO Leave Open CA11 GPIO2 Pull-Down Available-GPIO Leave Open CB10 GPIO3 Pull-Down Available-GPIO Leave Open CB11 GPIO4 Pull-Down Available-GPIO Leave Open CC7 GPIO5 Pull-Down Available-GPIO Leave Open CC8 GPIO6 Pull-Down Available-GPIO Leave Open CC9 GPIO7 Pull-Down Available-GPIO Leave Open CD7 GPIO8 Pull-Down Available-GPIO Leave Open Band indicator1 CE5 GPIO9 Pull-Down Available-GPIO Leave Open Band indicator2 CF5 GPIO10 Pull-Down Available-GPIO Leave Open Band indicator3 Refer to the Digital IO Characteristics section for electrical characteristics of these signals. 6.8.1. AT Port Switch The AirPrime AR7558 supports switching the active AT command port between USB and UART. Table 46. AT Port Switch States Pad Name State AT Port AB5 AT_PORT_SW Low (default) Available on USB High Available on UART1 6.9. Secure Digital IO The AirPrime AR7558 defines a 1.8V SDIO interface for future use. Table 47. SDIO Interface Pads Pad Name Direction Function If Unused AA11 SDIO_DATA0 Input/Output SDIO Data bit 0 Leave Open AA10 SDIO_DATA1 Input/Output SDIO Data bit 1 Leave Open AB9 SDIO_DATA2 Input/Output SDIO Data bit 2 Leave Open AB10 SDIO_DATA3 Input/Output SDIO Data bit 3 Leave Open AB8 SDIO_CMD Output SDIO Command Leave Open AA9 SDIO_CLK Output SDIO Clock Leave Open
4116922 Rev 1.1 January 21, 2015 39 Hardware Integration Guide Baseband Specification 6.10. I2C The AirPrime AR7558 provides an I2C interface. Table 48. I2C Interface Pads Pad Name Direction Function If Unused CD6 I2C_CLK Output I2C Clock output Leave Open CC6 I2C_SDA Input/Output I2C Data Leave Open The I2C signals are open drain outputs with 2.2 kΩ pull-up resistors to VCC_1V8 internal to the AirPrime AR7558. 6.11. Voltage Reference The AirPrime AR7558 utilizes 1.8V logic. A voltage reference output for this rail is provided below. Table 49. Voltage Reference Pad Pad Name Direction Function If Unused AA12 VCC_1V8 Output Voltage Reference Output Leave Open AB12 VCC_1V8 Output Voltage Reference Output Leave Open Table 50. Voltage Reference Characteristics Parameter Min Typ Max Units VCC_1V8 Voltage Level 1.746 1.8 1.854 V Output Current 25 mA The VCC_1V8 signal can be used to power external circuitry and/or detect the power state of the AirPrime AR7558 device. Using VCC_1V8 to determine the power state is recommended when the user application wants to disable VBATT. VBATT should not be disabled before VCC_1V8 goes inactive. To be able to detect the power state on VCC_1V8, all logic input signals to the AirPrime AR7558device must be set low (see Digital IO Characteristics for affected signal groups). The VCC_1V8 signal is High-Z when the AirPrime AR7558 embedded module is powered down. 6.12. RESET The AirPrime AR7558 provides an interface to allow an external application to RESET the module as well as an output to indicate the current RESET state or control an external device. Table 51. Reset Interface Pads Pad Name Direction Function If Unused AH2 RESIN_N Input External Reset Input Leave Open AG4 RESOUT_N Output Reset Output Leave Open
4116922 Rev 1.1 January 21, 2015 40 Hardware Integration Guide Baseband Specification The RESIN_N signal is pulled-up internal to the AirPrime AR7558. An open collector transistor or equivalent should be used to Ground the signal when necessary to RESET the module. Note: Use of the RESIN_N signal to RESET the AirPrime AR7558 could result in memory corruption if used inappropriately. This signal should only be used if the AirPrime AR7558 has become unresponsive and it is not possible to perform a power cycle. Table 52. Reset Timing Symbol Parameter Min Typ Max Trdet Duration of RESIN_N signal before firmware detects it (debounce timer) - 32 ms - Trlen Duration reset asserted 40 ms - ∞ Trdel Delay between minimum Reset duration and Internal Reset generated - 500 ms - RESIN_NRESOUT_NTrlenTrdelTrdet Figure 14. Illustration of Reset Timing When RESIN_N < Trdel RESIN_NRESOUT_NTrdet + Trdel Figure 15. Illustration of Reset Timing When RESIN_N Held Low > Trdet+Trdel 6.13. ADC The AirPrime AR7558 provides two ADC inputs. The interface information is provided in the tables below. Table 53. ADC Interface Pads Pad Name Direction Function If Unused DE3 ADC0 Input Analog to Digital Converter Input Leave Open or Ground DF2 ADC1 Input Analog to Digital Converter Input Leave Open or Ground
4116922 Rev 1.1 January 21, 2015 41 Hardware Integration Guide Baseband Specification Table 54. ADC Interface Characteristics ADC Value Units ADCx Full-Scale Voltage Level 1.8 V Resolution 15 bit Input Impedance >4 MΩ 6.14. LED The AirPrime AR7558 provides an LED control output signal pad. This signal is an open drain input. Table 55. LED Interface Pad Pad Name Direction Function If Unused AA6 LED Output LED driver control Leave Open Figure 16. LED Reference Circuit The behavior of the LED signal can be modified using the AT command AT!LEDCTRL. 6.15. Audio The AirPrime AR7558 supports both Analog and Digital audio interfaces. The following diagram illustrates the Audio subsystem and identifies where various AT commands affect the audio subsystem. Refer to document [7] for details of the AT commands. [Diagram tbd] Figure 17. Audio Block Diagram 6.15.1. Analog Audio The AirPrime AR7558 provides a mono differential analog audio interface. Table 56. Analog Audio Interface Pads Pad Name Direction Function Interface CD9 AUDIO1_IN_P Input Microphone 1 input positive Primary CC10 AUDIO1_IN_M Microphone 1 input negative CE6 AUDIO1_OUT_P Output Speaker 1 output positive CE8 AUDIO1_OUT_M Speaker 1 output negative
4116922 Rev 1.1 January 21, 2015 42 Hardware Integration Guide Baseband Specification Table 57. Analog Audio Interface Characteristics Analog Audio Min. Typ. Max. Units Audio IN Input Impedance 16 20 24 kΩ Signal Level – Differential -0.3 - 2.9 dBV Signal Level – Single-ended (the unused audio signal must be tied to GND or analog reference) -0.3 - 2.9 dBV Audio OUT Signal Level – Differential - - dBV Signal Level – Single-ended -0.3 - 2.9 dBV Output Impedance -0.3 - 2.9 Ω Signal Drive Strength – Application Load - 600 1M kΩ 6.15.2. Digital Audio The AirPrime AR7558 provides a 4-wire digital audio interface. This interface can be configured as either a PCM or an I2S. Table 58. Digital Audio Interface Pads Pad Name Direction1 PCM Function Direction I2S Function If Unused DB3 PCM_FS Output PCM Frame Sync Input/Output I2S_WS Leave Open DA3 PCM_CLK Output PCM Clock Input/Output I2S_SCLK Leave Open DC2 PCM_DOUT Output PCM Data Out Output I2S_DOUT Leave Open DD2 PCM_DIN Input PCM Data In Input I2S_DIN Leave Open 1 Direction when defined in Master mode. 6.15.2.1. PCM The AirPrime AR7558 PCM interface can be configured in one of two modes: primary PCM or auxiliary PCM mode. The table below defines the configurations for each of these two modes. Table 59. PCM Interface Configurations Element Primary PCM Auxiliary PCM Slot Configuration Slot-based Single Sync type Short Long Frequency 8 kHz Duty Cycle 50% Clock (Master) 2.048 MHz 128 kHz Data formats 16-bit linear, 8-bit A-law, 8-bit m-law AirPrime AR7558 Master/Slave Master or Slave Master
4116922 Rev 1.1 January 21, 2015 43 Hardware Integration Guide Baseband Specification 6.15.2.1.1. PCM Data format The PCM data is 8 kHz and 16 bits with the following PDM bit format:  PCM_DIN – SDDD DDDD DDDD DDVV  PCM_DOUT – SDDD DDDD DDDD DDVV Where:  S – Signed bit  D – Data  V – Volume padding 6.15.2.1.2. Primary PCM Timing The table and drawings below illustrate the PCM signals timing when the AirPrime AR7558 module is operating in Primary PCM mode. Table 60. Primary PCM Timing Parameter Description Min Typ Max unit T(sync) PCM_FS cycle time - 125 - µs T(synch) PCM_FS high time - 488 - ns T(syncl) PCM_FS low time - 124.5 - µs T(clk) PCM_CLK cycle time - 488 - ns T(clkh) PCM_CLK high time - 244 - ns T(clkl) PCM_CLK low time - 244 - ns T(susync) PCM_FS setup time high before falling edge of PCM_CLK - 122 - ns T(hsync) PCM_FS Hold time after falling edge of PCM_CLK - - 366 ns T(sudin) PCM_DIN setup time before falling edge of PCM_CLK 60 - - ns T(hdin) PCM_DIN hold time after falling edge of PCM_CLK 60 - - ns T(pdout) Delay from PCM_CLK rising to PCM_DOUT valid - - 60 ns T(zdout) Delay from PCM_CLK falling to PCM_DOUT HIGH-Z - - 60 ns Figure 18. PCM_FS Timing Diagram (2048 kHz Clock)
4116922 Rev 1.1 January 21, 2015 44 Hardware Integration Guide Baseband Specification Figure 19. PCM Codec to AR Device Timing Diagram (Primary PCM) Figure 20. AR Device to PCM Codec Timing Diagram (Primary PCM) 6.15.2.1.3. Auxiliary PCM Timing The table and drawings below illustrate the timing of the PCM signals when the AirPrime AR7558 module is operating in Auxiliary PCM mode. Table 61. Auxiliary PCM Timing Parameter Description Min Typ Max unit T(auxsync) PCM_FS cycle time - 125 - µs T(auxsynch) PCM_FS high time 62.4 62.5 - µs T(auxsyncl) PCM_FS low time 62.4 62.5 - µs T(auxclk) PCM_CLK cycle time - 7.8 - µs T(auxclkh) PCM_CLK high time 3.8 3.9 - µs T(auxclkl) PCM_CLK low time 3.8 3.9 - µs T(suauxsync) PCM_FS setup time high before falling edge of PCM_CLK 1.95 - - ns T(hauxsync) PCM_FS Hold time after falling edge of PCM_CLK 1.95 - - ns T(sudin) PCM_DIN setup time before falling edge of PCM_CLK 70 - - ns T(hauxdin) PCM_DIN hold time after falling edge of PCM_CLK 20 - - ns T(pauxdout) Delay from PCM_CLK rising to PCM_DOUT valid - - 50 ns
4116922 Rev 1.1 January 21, 2015 45 Hardware Integration Guide Baseband Specification Figure 21. PCM_FS Timing Diagram (128 kHz Clock) Figure 22. PCM Codec to AR Device Timing Diagram (Auxiliary PCM) Figure 23. AR Device to PCM Codec Timing Diagram (Auxiliary PCM) 6.15.2.2. I2S The AirPrime AR7558 I2S interface can be used to transfer serial digital audio to/from an external stereo DAC/ADC. The I2S interface is a 4-wire interface: serial clock (I2S_SCLK), word select (I2S_WS), serial uplink data (I2S_DIN), and serial downlink data (I2S_DOUT). The AirPrime AR7558 I2S interface can be configured as a master or slave and either transmitter or receiver. A high-level timing diagram of the I2S signals is presented below.
4116922 Rev 1.1 January 21, 2015 46 Hardware Integration Guide Baseband Specification Figure 24. I2S Signals Timing Diagram 6.15.2.2.1. I2S_DIN and I2S_DOUT The serial PCM stereo-data stream for both channels are output from the AirPrime AR7558 on the I2S_DOUT signal pin and input on the I2S_DIN signal pin. Serial data is transmitted in two’s complement, with the MSB first. The transmitter and receiver are not required to have the same word length:  When the transmitted word length is greater than the receiver word length, the bits after the receiver’s LSB are ignored; the rest of the transmitter’s LSBs are ignored.  When the transmitted word length is less than the receiver word length, the receiver’s missing LSB will be set to zero initially, so they will remain at zero.  The MSB has a fixed position, whereas the LSB position depends upon word length.  The transmitter always sends the MSB of the next word one clock period after WS changes.  Serial data sent by the transmitter may be synchronized with either the trailing (H-to-L) or leading (L-to-H) edge of the clock signal.  Serial data must be latched into the receiver on the leading edge of the serial clock signal. 6.15.2.2.2. I2S_WS The word-select line indicates the channel being transmitted / received:  0 specifies the left channel  1 specifies the right channel  The WS signal changes one clock period before the MSB is transmitted. 6.15.2.2.3. I2S_SCLK This is the serial bit clock whose rate is a function of the data width and sample rate: I2S_SCLK rate = (2 x bit_width) x FS Where bit_width = 16 bits per channel and FS is the sample rate, therefore: I2S_SCLK rate = 32 x FS Sample rates of 8, 16, 24, 32, 44.1, and 48 kHz are supported. An example clock rate is: I2S_SCLK rate = (2 x 16) x 48 kHz = 1.536 MHz Where bit_width = 16 and FS = 48 kHz.
4116922 Rev 1.1 January 21, 2015 47 Hardware Integration Guide Baseband Specification 6.16. SPI Bus The AirPrime AR7558 embedded module provides one SPI bus (4-wire interface). SPI bus interface includes:  A CLK signal  An O signal  An I signal  A CS (Chip Select) signal 6.16.1. Characteristics The following features are available on the SPI bus:  Master-only mode operation  SPI speed is from 128 kbit/s to 26 Mbit/s in master mode operation  4-wire interface  4 to 32 (TBD) bits data length. 6.16.2. SPI Configuration Table 62. SPI Configuration Operation Maximum Speed SPI-Mode Duplex 4-wire Type Master 26Mb/s 0,1,2,3 full SPIx-CLK; SPIx-IO; SPIx-I; SPIx_CS For the 4-wire configuration, SPIx-I/O is used as output only, SPIx-I is used as input only (TBC by firmware). 6.16.3. SPI Waveforms The following figure shows waveforms for SPI transfer with 4-wire configuration. Figure 25. 4-Wire Configuration SPI Transfer
4116922 Rev 1.1 January 21, 2015 48 Hardware Integration Guide Baseband Specification Table 63. SPI Master Timing Characteristics Parameter Min Typ Max Unit SPI clock frequency - - 26 MHz T SPI clock period 38 - - ns t(ch) Clock high 17 - - ns t(cl) Clock low 17 - - ns t(mov) Master output valid -5 - 5 ns t(mis) Master input setup 0 - 3 ns t(moh) Master output hold 0 - 3 ns t(tse) Tri-state enable -5 - 5 ns t(tsd) Tri-state disable -5 - 5 ns 6.16.4. SPI Pin Description Refer to the following table for the SPI interface pin description. Table 64. SPI Pin Description Signal Pin # I/O I/O Type Reset State Description SPI-CLK CE4 O 1V8 Z SPI Serial Clock SPI-MISO CE3 I 1V8 Z SPI Serial input SPI-MOSI CD4 O 1V8 Z SPI Serial output SPI_CS CD5 O 1V8 Z SPI Chip Select 6.16.5. Application A 4-wire SPI configuration has the input and output data lines disassociated. Figure 26. Example of 4-wire SPI Bus Application
4116922 Rev 1.1 January 21, 2015 49 Hardware Integration Guide Baseband Specification 6.17. HSIC Bus The AirPrime AR7558 embedded module provides one HSIC bus (2-wire interface). HSIC bus interface includes:  HSIC strobe signal  HSIC data signal  Calibration pad for HSIC port signal 6.17.1. HSIC Pin Description Refer to the following table for the HSIC interface pin description. Table 65. HSIC Pin Description Signal Pin # I/O I/O Type Reset State Description HSIC_STB AA2 B 1V2 Z HSIC strobe signal HSIC_DATA AA3 B 1V2 Z HSIC data HSIC_CAL AA4 B 1V2 Z HSIC calibration pad 6.17.2. HSIC Waveforms The following figure shows waveforms for HSIC signal sample. Figure 27. HSIC Signal Sample Waveforms
4116922 Rev 1.1 January 21, 2015 50 Hardware Integration Guide Baseband Specification 6.17.3. Application A 4-wire SPI configuration has the input and output data lines disassociated. AirPrime AR755XCustomer ApplicationHSIC_ReadyHSIC_STBHSIC_DATAHSIC_CAL240ohm Figure 28. Example of HSIC Bus Application Note: Trace length to 10cm maximum Skew between data and strobe signals < 15ps, and Connect HSIC_Ready to HSIC_RST_N of the HSIC device.
4116922 Rev 1.1 January 21, 2015 51 Hardware Integration Guide Baseband Specification 6.18. Temperature Monitoring The AirPrime AR7558 has internal temperature monitoring of both the PMIC device and the Power Amplifier devices. Normal High TemperatureWarningPower off.Handled byPower Statestate machine.High TemperatureCritical(Low power mode)Low TemperatureCritical(Low power mode)current_temp < TEMP_HI_WARNcurrent_temp < TEMP_LO_CRITcurrent_temp > TEMP_NORM_LOcurrent_temp > TEMP_HI_CRITApplication asserts ON/OFF OrIssues AT!POWERDOWNApplication asserts ON/OFF OrIssues AT!POWERDOWNcurrent_temp > TEMP_HI_WARNcurrent_temp < TEMP_HI_NORM Figure 29. Temperature Monitoring State Machine Table 66. Temperature Monitoring States State Description Threshold1 Default Temp value (°C) Functionality Normal Both PMIC and PA Thermistors are between TEMP_HI_NORM +85 All TEMP_LO_NORM -40 High Temperature Warning Either PMIC or PA Thermistor has exceeded TEMP_HI_WARN +95 All – Warning message output on AT Command port High Temperature Critical Either PMIC or PA Thermistor has exceeded TEMP_HI_CRIT 140 Low Power Mode – Device will only make Emergency calls Low Temperature Critical Either PMIC or PA Thermistor has descended past TEMP_HI_CRIT -45 Low Power Mode – Device will only make Emergency calls 1 There are two sets of thresholds: PATEMP for PA Thermistor, and PCTEMP for PMIC Thermistor. To restore full operation, temperature readings for both the PA and PMIC Thermistors must be within the Normal or High Temperature Warning state thresholds.
4116922 Rev 1.0 January 21, 2015 52 7. Routing Constraints and Recommendations Layout and routing of the AirPrime AR7558 device in the application is critical to maintaining the performance of the radio. The following sections provide guidance to the developer when designing their application to include an AirPrime AR7558 device and achieve optimal system performance. 7.1. RF Routing Recommendations To route the RF antenna signals, the following recommendations must be observed for PCB layout: The RF signals must be routed using traces with a 50  characteristic impedance. Basically, the characteristic impedance depends on the dielectric constant (εr) of the material used, trace width (W), trace thickness (T), and height (H) between the trace and the reference ground plane. In order to respect this constraint, Sierra Wireless recommends that a MicroStrip structure be used and trace width be computed with a simulation tool (such as AppCAD, shown in the figure below and available free of charge at http://www.avagotech.com). Figure 30. AppCAD Screenshot for Microstrip Design Power Mode Diagram The trace width should be wide enough to maintain reasonable insertion loss and manufacturing reliability. Cutting out inner layers of ground under the trace will increase the effective substrate height; therefore, increasing the width of the RF trace. Caution: It is critical that no other signals (digital, analog, or supply) cross under the RF path. The figure below shows a generic example of good and poor routing techniques.
4116922 Rev 1.1 January 21, 2015 53 Hardware Integration Guide Routing Constraints and Recommendations Poor routing Correct routing The yellow traces cross the RF trace. There is no signal around the RF path. Figure 31. RF Routing Examples  Fill the area around the RF traces with ground and ground vias to connect inner ground layers for isolation.  Cut out ground fill under RF signal pads to reduce stray capacitance losses.  Avoid routing RF traces with sharp corners. A smooth radius is recommended. E.g. Use of 45° angles instead of 90°.  The ground reference plane should be a solid continuous plane under the trace.  The coplanar clearance (G, below) from the trace to the ground should be at least the trace width (W) and at least twice the height (H). This reduces the parasitic capacitance, which potentially alters the trace impedance and increases the losses. E.g. If W = 100 microns then G = 200 microns in an ideal setup. G = 150 microns would also be acceptable is space is limited. Figure 32. Coplanar Clearance Example Note: The figure above shows several internal ground layers cut out, which may not be necessary for every application.
4116922 Rev 1.1 January 21, 2015 54 Hardware Integration Guide Routing Constraints and Recommendations Figure 33. Antenna Microstrip Routing Example 7.2. Power and Ground Recommendations Power and ground routing is critical to achieving optimal performance of the AirPrime AR7558 devices when integrated into an application. Recommendations:  Do not use a separate GND for the Antennas  Connections to GND from the AirPrime AR7558 should be flooded plane using thermal reliefs to ensure reliable solder joints.  VBATT is recommended to be routed as a wide trace(s) directly from the 4V supply to the LGA pad. 7.3. Antenna Recommendations TBD.
4116922 Rev 1.1 January 21, 2015 55 Hardware Integration Guide Routing Constraints and Recommendations 7.4. Interface Circuit Recommendations The recommended interface implementation is to use open-drain non-inverting buffers with pull-ups to the appropriate voltage reference. This allows a host processor operating at a different voltage to communicate with the AirPrime AR7558 using the appropriate voltage levels. The figure below is a reference circuit for a digital input signal to the AirPrime AR7558 device. OVTVCCOutput from AppInput to AirPrime AR moduleVCC_1V8Vref of APP Figure 34. AirPrime AR7558 Input Reference Circuit The figure below is a reference circuit for a digital output signal from the AirPrime AR7558 device. OVTVCC Output from AirPrime AR moduleInput to AppVref of APPVCC_1V8 Figure 35. AirPrime AR7558 Output Reference Circuit The open-drain non-inverting buffer used in the reference circuits above is the OnSemi NL17SZ07. Tip: The NL17SZ07 is over-voltage tolerant on the inputs. It may be possible to power all the buffers from the 1.8V reference voltage output. Review the digital output characteristics of the applications drivers and the Input characteristics of the buffer selected to determine if this would work in your application. If a Digital IO signal is used bidirectional in the application then a bidirectional buffer or bidirectional level translator is needed.
4116922 Rev 1.0 January 21, 2015 56 8. Regulatory Information 8.1. Important Notice Because of the nature of wireless communications, transmission and reception of data can never be guaranteed. Data may be delayed, corrupted (i.e., have errors) or be totally lost. Although significant delays or losses of data are rare when wireless devices such as the Sierra Wireless modem are used in a normal manner with a well-constructed network, the Sierra Wireless modem should not be used in situations where failure to transmit or receive data could result in damage of any kind to the user or any other party, including but not limited to personal injury, death, or loss of property. Sierra Wireless and its affiliates accept no responsibility for damages of any kind resulting from delays or errors in data transmitted or received using Sierra Wireless modem, or for failure of the Sierra Wireless modem to transmit or receive such data. 8.2. Safety and Hazards Do not operate the AR7558 modem:  In areas where blasting is in progress  Where explosive atmospheres may be present including refueling points, fuel depots, and chemical plants  Near medical equipment, life support equipment, or any equipment which may be susceptible to any form of radio interference. In such areas, the AR Series device MUST BE POWERED OFF. Otherwise, the AR Series device can transmit signals that could interfere with this equipment  In an aircraft, the AR Series device MUST BE POWERED OFF. Otherwise, the AR Series device can transmit signals that could interfere with various onboard systems and may be dangerous to the operation of the aircraft or disrupt the cellular network. Use of cellular phone in aircraft is illegal in some jurisdictions. Failure to observe this instruction may lead to suspension or denial of cellular telephone services to the offender, or legal action or both.  Some airlines may permit the use of cellular phones while the aircraft is on the ground and the door is open. The AR Series device may be used normally at this time. 8.3. Important Compliance Information for USA OEM Integrators The AR Series device is granted with a modular approval for mobile applications. Integrators may use the AR Series device in their final products without additional FCC/IC (Industry Canada) certification if they meet the following conditions. Otherwise, additional FCC/IC approvals must be obtained. 1. At least 20cm separation distance between the antenna and the user’s body must be maintained at all times. 2. To comply with FCC/IC regulations limiting both maximum RF output power and human exposure to RF radiation, the maximum antenna gain including cable loss in a mobile-only exposure condition must not exceed the gain values presented in the table below:  4.5 dBi in Cellular band  1.0 dBi in PCS band  5.0 dBi in LTE Band 4  1.0 dBi in LTE Band 25  4.5 dBi in LTE Band 26
4116922 Rev 1.1 January 21, 2015 57 Hardware Integration Guide Regulatory Information  7.0 dBi in LTE Band 41 3. The AR7558 modem may transmit simultaneously with other collocated radio transmitters within a host device, provided the following conditions are met:  Each collocated radio transmitter has been certfied by FCC / IC for mobile application.  At least 20 cm separation distance between the antennas of the collocated transmitters and the user’s body must be maintained at all times.  The output power and antenna gain must not exceed the limits and configurations stipulated in the following table. Device Technology Frequency (MHz) Maximum conducted power Maximum antenna gain Collocated antenna gain AR7558 Module CDMA 824-849 25.0 4.5 2.0 1850-1910 25.0 1.0 1.0 817-824 25.0 4.5 2.0 GPRS 824-849 35.0 4.5 2.0 1850-1910 32.0 1.0 1.0 EDGE 824-849 27.0 4.5 2.0 1850-1910 26.0 1.0 1.0 UMTS 824-849 25.7 4.5 2.0 1850-1910 25.7 1.0 1.0 LTE 1710 -1755 25.0 5.0 5.0 1850 -1915 25.0 1.0 1.0 814 -849 25.0 4.5 2.0 2496 -2690 25.7 7.0 7.0 Collocated transmitters1 WLAN 2400-2500 29 5 5150-580 29 5 WiMAX 2300-2400 29 5 2500-2700 29 5 3300-3800 29 5 BT 2400-2500 15 5 1. Valid collocated Transmitter combinations: WLAN+BT; WiMAX+BT. (WLAN+WiMAX+BT is not permitted.) 4. A label must be affixed to the outside of the end product into which the AirPrime AR7558 device is incorporated, with a statement similar to the following: This device contains FCC ID: N7NAR7558 This equipment contains equipment certified under IC: 2417C-AR7558 5. A user manual with the end product must clearly indicate the operating requirements and conditions that must be observed to ensure compliance with current FCC/IC RF exposure guidelines. The end product with an embedded AirPrime AR7558 device may also need to pass the FCC Part 15 unintentional emission testing requirements and be properly authorized.
4116922 Rev 1.1 January 21, 2015 58 Hardware Integration Guide Regulatory Information Note: If this module is intended for use in a portable device, you are responsible for separate approval to satisfy the SAR requirements of FCC Part 2.1093 and IC RSS-102.
4116922 Rev 1.0 January 21, 2015 59 9. References The table below lists the reference specifications for this product. Table 67. Reference Specifications Ref Title Issuer [1] Recommended Minimum Performance Standards for cdma2000 High Rate Packet Data Access Terminal – C.S0033 3GPP2 [2] Recommended Minimum Performance Standards for cdma2000 Spread Spectrum Mobile Stations – C.S0011 (IS-98D) 3GPP2 [3] Universal Serial Bus Specification USB Implementers Forum [4] Universal Serial Bus CDC Subclass Specification for Wireless Mobile Communication Devices USB Implementers Forum [5] Universal Serial Bus Class Definitions for Communication Devices USB Implementers Forum [6] AirPrime AR Series Customer Process Guidelines Sierra Wireless [7] AirPrime AR7 Series AT Command Interface Specification Sierra Wireless [8] AirPrime AR7 Series Firmware Download Guide Sierra Wireless
4116922 Rev 1.0 January 21, 2015 60 10. Abbreviations The table below lists several abbreviations used in this document. Table 68. Abbreviations Abbreviation Description CDMA Code Division Multiple Access DRX Discontinuous Receive GNSS Global Navigation Satellite System GSM Global System for Mobile Communications HSPA High Speed Packet Access LTE Long Term Evolution SCI Slot Cycle Index USB Universal Serial Bus WCDMA Wideband Code Division Multiple Access WWAN Wireless Wide Area Network

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