Simcom 1009092010007 GSM/GPRS/EDGE/WCDMA module User Manual SIM5215A HD V1 02 100826

Shanghai Simcom Ltd. GSM/GPRS/EDGE/WCDMA module SIM5215A HD V1 02 100826

Installation instructions

     Hardware Design SIM5215A _HD_V1.02
 Document Title: SIM5215A  Hardware Design Version: 1.02 Date: 2010-08-26 Status: Release Document Control ID: SIM5215A _HD_V1.02    General Notes SIMCOM offers this information as a service to its customers, to support application and engineering efforts that use the products designed by SIMCOM.  The information provided is based upon requirements specifically provided to SIMCOM by the customers.    SIMCOM has not undertaken any independent search for additional relevant information, including any information that may be in the customer’s possession. Furthermore, system validation of this product designed by SIMCOM within a larger electronic system remains the responsibility of the customer or the customer’s system integrator.    All specifications supplied herein are subject to change.      NOTICE: This device complies with Part 15 of the FCC Rules [and with RSS-210 of Industry Canada]. Operation is subject to the following two conditions: (1)  this device may not cause harmful interference, and   (2)  this device must accept any interference received, including interference that may cause undesired operation.  Changes or modifications made to this equipment not expressly approved by SIMCOM may void the FCC authorization to operate this equipment.  This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules.    These limits are designed to provide reasonable protection against harmful interference in a residential installation.    This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications.    However, there is no guarantee that interference will not occur in a particular installation.    If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures: • Reorient or relocate the receiving antenna. • Increase the separation between the equipment and receiver. • Connect the equipment into an outlet on a circuit different from that to which the receiver is connected. • Consult the dealer or an experienced radio/TV technician for help.
 SIM5215A _HD_V1.02 Hardware Design                                     SIM5215A _HD_V1.02   26.08.2010   2This Class [B] digital apparatus complies with Canadian ICES-003. Cet appareil numérique de la classe [*] est conforme à la norme NMB-003 du Canada.  Radiofrequency radiation exposure Information: This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment. This equipment should be installed and operated with minimum distance of 20 cm between the radiator and your body. This transmitter must not be co-located or operating in conjunction with any other antenna or transmitter.   Copyright This document contains proprietary technical information which is the property of SIMCOM Limited., copying of this document and giving it to others and the using or communication of the contents thereof, are forbidden without express authority.    Offenders are liable to the payment of damages.    All rights reserved in the event of grant of a patent or the registration of a utility model or design.    All specification supplied herein are subject to change without notice at any time.  Copyright © Shanghai SIMCOM Wireless Solutions Ltd. 2010
 SIM5215A _HD_V1.02 Hardware Design                                     SIM5215A _HD_V1.02   26.08.2010   3Version history Data  Version  Description of change  Author 2010-4-26  01.00  Origin   2010-07-19  01.01 Add RESET timing and module is waked up by DTR signal description, modify the description of PCM interface libing 2010-08-26  01.02  Add firmware update description  libing
 SIM5215A _HD_V1.02 Hardware Design                                     SIM5215A _HD_V1.02   26.08.2010   4Contents   Version history..............................................................................................................3 1 Introduction...............................................................................................................6 1.1 Related documents ..............................................................................................................6 1.2 Terms and abbreviations......................................................................................................7 2 Product concept.......................................................................................................10 3 Application interface...............................................................................................13 3.1 SIM5215A pin description ................................................................................................14 3.2 Operating modes ...............................................................................................................17 3.3 Power supply.....................................................................................................................18 3.3.1 Power supply pins on the board-to-board connector ....................................................................... 19 3.3.2 Minimizing power losses ................................................................................................................ 20 3.3.3 Monitoring power supply ................................................................................................................20 3.4 Power up and power down scenarios ................................................................................20 3.4.1 Turn on SIM5215A ......................................................................................................................... 20 3.4.2 Turn off SIM5215A.........................................................................................................................21 3.5 Power saving.....................................................................................................................22 3.5.1 Minimum functionality mode.......................................................................................................... 22 3.5.2 Flight mode .....................................................................................................................................23 3.5.3 Sleep Mode ..................................................................................................................................... 23 3.5.4 Wake up SIM5215A from Sleep Mode ........................................................................................... 24 3.6 RTC backup.......................................................................................................................24 3.7 Serial interface ..................................................................................................................26 3.8 Audio interfaces ................................................................................................................29 3.8.1 Speaker interface configuration....................................................................................................... 30 3.8.2 Microphone interfaces configuration .............................................................................................. 31 3.8.3 Earphone interface configuration .................................................................................................... 32 3.8.4 Referenced electronic characteristic................................................................................................ 32 3.8.5 Programming characteristic............................................................................................................. 33 3.9 USIM card interface..........................................................................................................36 3.9.1 USIM card application ....................................................................................................................36 3.9.2 Design considerations for USIM card holder .................................................................................. 37 3.10 I2C interface....................................................................................................................38 3.11 USB interface ..................................................................................................................39 3.12 Module Reset ..................................................................................................................40 3.13 General purpose input & output (GPIO) .........................................................................40 3.14 ADC interface .................................................................................................................42 3.15 LDO power output ..........................................................................................................43 3.16 Camera module interface ................................................................................................43 3.17 MMC/SD card interface..................................................................................................46 3.18 PCM Interface .................................................................................................................48
 SIM5215A _HD_V1.02 Hardware Design                                     SIM5215A _HD_V1.02   26.08.2010   53.18.1 Auxiliary PCM (128 kHz PCM clock) .......................................................................................... 50 3.18.2 Primary PCM (2048 kHz PCM clock) .......................................................................................... 51 3.18.3 Transmitting PCM data by USB.................................................................................................... 53 3.19 Firmware update .............................................................................................................53 3.19.1 SD Card update ............................................................................................................................. 53 3.19.2 USB interface update. ...................................................................................................................54 4 Antenna interface....................................................................................................57 4.1 Antenna installation...........................................................................................................57 4.1.1 Antenna connector...........................................................................................................................57 4.2 Module RF output power ..................................................................................................59 4.3 Module RF receiver sensitivity .........................................................................................59 4.4 Module operating frequencies...........................................................................................59 5 Electrical, reliability and radio characteristics....................................................60 5.1 Absolute maximum ratings ...............................................................................................60 5.2 Operating temperatures .....................................................................................................60 5.3 Power supply ratings.........................................................................................................60 5.4 Current consumption.........................................................................................................61 5.5 Electro-Static discharge.....................................................................................................63 6 Mechanics ................................................................................................................65 6.1 Mechanical dimensions of SIM5215A..............................................................................65 6.2 Mounting SIM5215A onto the application platform.........................................................65 6.3 Board-to-board connector .................................................................................................67 6.4 RF connector and adapter cable ........................................................................................68 6.5 View of the SIM5215A .....................................................................................................70 6.6 PIN assignment of board-to-board connector of SIM5215A ............................................70
 SIM5215A _HD_V1.02 Hardware Design                                     SIM5215A _HD_V1.02   26.08.2010   61 Introduction This document describes the hardware interface of the SIMCOM SIM5215A module that connects to the specific application and the air interface.    As SIM5215A can be integrated with a wide range of applications, all functional components of SIM5215A are described in great detail.   This document can help you quickly understand SIM5215A interface specifications, electrical and mechanical details.    With the help of this document and other SIM5215A application notes, user guide, you can use SIM5215A module to design and set-up mobile applications quickly. 1.1 Related documents Table 1: Related documents SN  Document name  Remark [1]  SIMCOM_SIM5215_ATC_EN_V1.03 SIMCOM_SIM5215_ATC_EN_V1.03 [2]  ITU-T Draft new recommendationV.25ter: Serial asynchronous automatic dialing and control [3]  GSM 07.07:  Digital cellular telecommunications (Phase 2+); AT command set for GSM Mobile Equipment (ME) [4]  GSM 07.10:  Support GSM 07.10 multiplexing protocol   [5]  GSM 07.05:  Digital cellular telecommunications (Phase 2+); Use of Data Terminal Equipment – Data Circuit terminating Equipment (DTE – DCE) interface for Short Message Service (SMS) and Cell Broadcast Service (CBS) [6]  GSM 11.14:  Digital cellular telecommunications system (Phase 2+); Specification of the SIM Application Toolkit for the Subscriber Identity Module – Mobile Equipment (SIM – ME) interface [7]  GSM 11.11:  Digital cellular telecommunications system (Phase 2+); Specification of the Subscriber Identity Module – Mobile Equipment (SIM – ME) interface [8]  GSM 03.38:  Digital cellular telecommunications system (Phase 2+); Alphabets and language-specific information [9]  GSM 11.10  Digital cellular telecommunications system (Phase 2);  Mobile Station (MS) conformance specification; Part 1: Conformance specification [10]  3GPP TS 51.010-1  Digital cellular telecommunications system (Release 5); Mobile Station(MS) conformance specification [11]  3GPP TS 34.124  Electromagnetic Compatibility (EMC) for mobile terminals and ancillary equipment.  [12]  3GPP TS 34.121  Electromagnetic Compatibility (EMC) for mobile terminals and ancillary equipment. [13]  3GPP TS 34.123-1  Technical Specification Group Radio Access Network; Terminal conformance specification; Radio transmission and reception (FDD) [14]  3GPP TS 34.123-3  User Equipment (UE) conformance specification; Part 3: Abstract Test Suites.
 SIM5215A _HD_V1.02 Hardware Design                                     SIM5215A _HD_V1.02   26.08.2010   7[15]  EN 301 908-02 V3.2.1  Electromagnetic compatibility and Radio spectrum Matters (ERMStations (BS) and User Equipment (UE) for IMT-2000 Third Genecellular networks; Part 2: Harmonized EN for IMT-2000, CDMA DSpread (UTRA FDD) (UE) covering essential requirements of artiof the R&TTE Directive [16]  EN 301 489-24 V1.4.1  Electromagnetic compatibility and Radio Spectrum Matters (ERM); Electromagnetic Compatibility (EMC) standard for radio equipment and services; Part 24: Specific conditions for IMT-2000 CDMA Direct Spread (UTRA) for Mobile and portable (UE) radio and ancillary equipment [17]  IEC/EN60950-1(2006)  Safety of information technology equipment (2000) [18]  3GPP TS 51.010-1  Digital cellular telecommunications system (Release 5); Mobile Station (MS) conformance specification [19]  GCF-CC V3.23.1  Global Certification Forum - Certification Criteria [20]  2002/95/EC  Directive of the European Parliament and of the Council of 27 January 2003 on the restriction of the use of certain hazardous substances in electrical and electronic equipment(RoHS) [21]  SIM52xx_Audio_Application_Note_V1.01 SIM52xx_Audio_Application_Note_V1.01 [22]  SIM52xx_PCM_Application_Note_V1.02 SIM52xx_PCM_Application_Note_V1.02 [23]  SIM52xx_Waking_up_Application_Note_V1.03 SIM52xx_Waking_up_Application_Note_V1.03 1.2 Terms and abbreviations Table 2: Terms and abbreviations Abbreviation   Description ADC   Analog-to-Digital Converter ARP   Antenna Reference Point BER   Bit Error Rate BTS   Base Transceiver Station CS   Coding Scheme CSD   Circuit Switched Data CTS   Clear to Send DAC   Digital-to-Analog Converter DRX   Discontinuous Reception DSP   Digital Signal Processor DTE   Data Terminal Equipment (typically computer, terminal, printer) DTR   Data Terminal Ready DTX   Discontinuous Transmission EFR   Enhanced Full Rate EGSM   Enhanced GSM EMC   Electromagnetic Compatibility ESD   Electrostatic Discharge ETS   European Telecommunication Standard
 SIM5215A _HD_V1.02 Hardware Design                                     SIM5215A _HD_V1.02   26.08.2010   8FCC   Federal Communications Commission (U.S.) FDMA   Frequency Division Multiple Access FR   Full Rate GMSK  Gaussian Minimum Shift Keying GPRS   General Packet Radio Service GSM   Global Standard for Mobile Communications HR   Half Rate I2C  Inter-Integrated Circuit IMEI   International Mobile Equipment Identity Inorm  Normal Current Imax  Maximum Load Current kbps   Kilo bits per second Li-Ion  Lithium-Ion MO   Mobile Originated MS   Mobile Station (GSM engine), also referred to as TE MT   Mobile Terminated PAP   Password Authentication Protocol PBCCH   Packet Switched Broadcast Control Channel PCB   Printed Circuit Board PCS   Personal Communication System, also referred to as GSM 1900 RF   Radio Frequency RMS   Root Mean Square (value) RTC   Real Time Clock Rx   Receive Direction SIM   Subscriber Identification Module SMS   Short Message Service SPI  serial peripheral interface TDMA   Time Division Multiple Access TE   Terminal Equipment, also referred to as DTE TX   Transmit Direction UART  Universal Asynchronous Receiver & Transmitter VSWR   Voltage Standing Wave Ratio Vmax  Maximum Voltage Value   Vnorm  Normal Voltage Value Vmin  Minimum Voltage Value VIHmax  Maximum Input High Level Voltage Value VIHmin  Minimum Input High Level Voltage Value VILmax  Maximum Input Low Level Voltage Value VILmin  Minimum Input Low Level Voltage Value VImax  Absolute Maximum Input Voltage Value VImin  Absolute Minimum Input Voltage Value
 SIM5215A _HD_V1.02 Hardware Design                                     SIM5215A _HD_V1.02   26.08.2010   9VOHmax  Maximum Output High Level Voltage Value VOHmin  Minimum Output High Level Voltage Value VOLmax  Maximum Output Low Level Voltage Value VOLmin  Minimum Output Low Level Voltage Value FD  SIM fix dialing phonebook SM   SIM phonebook NC  Not connect EDGE  Enhanced data rates for GSM evolution HSDPA   High Speed Downlink Packet Access HSUPA   High Speed Uplink Packet Access ZIF  Zero intermediate frequency WCDMA  Wideband Code Division Multiple Access VCTCXO  Voltage control temperature-compensated crystal oscillator USIM  Universal subscriber identity module UMTS  Universal mobile telecommunications system UART  Universal asynchronous receiver transmitter A-GPS  Assisted Global positioning system GPS  Global positioning system S-GPS  Simultaneous Global positioning system
 SIM5215A _HD_V1.02 Hardware Design                                     SIM5215A _HD_V1.02   26.08.2010   102 Product concept Designed for global market, SIM5215A is a quad-band GSM/GPRS/EDGE and dual-band UMTS engine that works on frequencies of GSM 850MHz, EGSM 900 MHz, DCS 1800 MHz, PCS 1900MHz, and WCDMA 1900M/850M.  SIM5215A provides GPRS multi-slot class 12/class10/class 8 (optional) capability and EDGE, supports the GPRS coding schemes CS-1, CS-2, CS-3 and CS-4. EDGE: 8 PSK, DTM (class A) multi-slot class 12, DL coding schemes: MCS1-9, UL coding schemes: MCS1-9.      With a tiny configuration of 36mm × 26mm ×  4.5 mm, SIM5215A can fit almost all the space requirements in your applications, such as AMR, POS, Security & Surveillance and other mobile devices.  The physical interface to the mobile application is made through a 70 pins board-to-board connector, which provides all hardware interfaces between the module and customers’ boards except the RF antenna interface.    z Serial port and USB 2.0 port can be alternatively used as data port. z USIM interface: support SIM cards: 3V & 1.8V z Power on/off and reset signal z Backup RTC interface. z Six GPIOs: 1 for interrupt, 1 for flight mode, 1 for status LED, 2 for output control, 1 for input, also can be multiplex as a PCM interface. z Three audio channels include two microphones inputs and three audio outputs. This can be easily configured by AT command. z A camera interface is provided,(if above pins are not used as camera interface ,it could be configured as GPIOs.. z An I2C interface is provided. z An ADC interface z A LDO power output z A 4 bit SD card interface z A PCM interface, all pins of PCM interface can be configured as GPIOs(default are GPIOs).   The SIM5215A provides RF antenna interface with two alternatives: antenna connector and antenna pad. The antenna connector is MURATA MM9329-2700. And customer’s antenna can be soldered to the antenna pad.  The SIM5215A is integrated with the TCP/IP protocol,Extended TCP/IP AT commands are developed for customers to use the TCP/IP protocol easily, which is very useful for those data transfer applications. FTP/HTTP/ SMTP/POP3/ MMS/ LUA Script is integrated in SIM5215A too.  Note: The SIM5215A has two kinds of interface (UART and USB) to connect to host CPU.
 SIM5215A _HD_V1.02 Hardware Design                                     SIM5215A _HD_V1.02   26.08.2010   11USB interface is mapped to five virtual ports: “SIMTECH USB Modem”, “SIMTECH NMEA Device”, “SIMTECH ATCOM Device”, “SIMTECH Diagnostics interface” and “SIMTECH Wireless Ethernet Adapter”.  UART, “SIMTECH USB Modem” and “SIMTECH ATCOM Device” could respond to AT command, and URC report to these three ports at the same time, but user could set dedicated port to receive URC (Unsolicited Result Code).    SIM5215A key features at a glance:   Table 3: SIM5215A key features Feature   Implementation Power supply  Single supply voltage 3.4V – 4.2V Power saving  Please refer to Table 39 Frequency bands  z GSM: 850M/ 900M/ DCS 1800M /PCS 1900M z WCDMA: 1900M/850M z The SIM5215A can worked in GSM and WCDMA mode z The frequency bands also can be set by AT + CNMP. Transmit power    ●Class 4 (+33dBm ±2dB) for GSM850 ●Class 4 (+33dBm ±2dB) for EGSM900 ●Class 1 (+30dBm ±2dB) for GSM1800 ●Class 1 (+30dBm ±2dB) for GSM1900 ●Class E2 (+27dBm ± 3dB) for GSM 850 8-PSK ●Class E2 (+27dBm ± 3dB) for GSM 900 8-PSK ●Class E2 (+26dBm +3 /-4dB) for GSM 1800 8-PSK ●Class E2 (+26dBm +3 /-4dB) for GSM 1900 8-PSK ●Class 3 (+24dBm +1.7/-3.7dB) for WCDMA 1900, WCDMA FDD BDII ●Class 3 (+24dBm +1.7/-3.7dB) for WCDMA 850, WCDMA FDD BDV GPRS/EDGE connectivity z GPRS/EDGE multi-slot is up to class 12   z GPRS mobile station class B Temperature range    z Operating Temperature: -30°C to +80°C z Storage temperature -40°C to +85°C DATA GPRS:        z GPRS data downlink transfer: max. 85.6 kbps   z GPRS data uplink transfer: max. 42.8 kbps   z Coding scheme: CS-1, CS-2, CS-3 and CS-4 z SIM5215A supports the protocols PAP (Password Authentication Protocol) usually used for PPP connections. z The SIM5215A integrates the TCP/IP protocol. z Support Packet Switched Broadcast Control Channel (PBCCH)   z CSD transmission rates: 2.4, 4.8, 9.6, 14.4 kbps, non-transparent z Unstructured Supplementary Services Data (USSD) support DATA EDGE  z EDGE E2 power class for 8 PSK z DTM (simple class A), multi-slot class 12 z Downlink coding schemes – MCS 1-9 z Uplink coding schemes – MCS 1-9
 SIM5215A _HD_V1.02 Hardware Design                                     SIM5215A _HD_V1.02   26.08.2010   12z BEP reporting and test mode B z 8-bit, 11-bit RACH z PBCCH support z phase/2 phase access procedures DATA UMTS  z R99  z  SMS  z MT, MO, CB, Text and PDU mode z SMS storage: SIM card z Support transmission of SMS alternatively over CSD or GPRS. User can choose preferred mode. SIM interface  Support SIM card: 1.8V ,3V External antenna  Connected via 50 Ohm antenna connector or antenna pad Audio features  Speech codec modes: z Half Rate (ETS 06.20) z Full Rate (ETS 06.10) z Enhanced Full Rate (ETS 06.50 / 06.60 / 06.80) z AMR(WCDMA)  z AMR+QCP(GSM) z A5/1, A5/2, and A5/3 ciphering Serial interface  z Serial Port standard or null modem mode on Serial Port Interface z Serial Port can be used to control module by sending AT command. Phonebook management Support phonebook types: SM, FD, LD, RC, ON, MC. SIM Application Toolkit Support SAT class 3, GSM 11.14 Release 98 Support USAT Real time clock  Implemented Timer function  Programmable via at command Physical characteristics  Size:  36 mm ×26mm ×4.5 mm Weight: 7g Firmware upgrade  Firmware upgrade over USB interface   PCM  Multiplex on GPIOs. 3 formats: 8 bit (υ-law or A-law) and 16 bit (linear).   Table 4:Coding schemes and maximum net data rates over air interface Coding scheme  1 Timeslot  2 Timeslot  4 Timeslot CS-1:  9.05kbps  18.1kbps  36.2kbps CS-2:  13.4kbps  26.8kbps  53.6kbps CS-3:  15.6kbps  31.2kbps  62.4kbps CS-4:  21.4kbps  42.8kbps  85.6kbps MCS-1  8.80kbps  17.60kbps  35.20kbps MCS-2  11.2kbps  22.4kbps  44.8kbps MCS-3-  14.8kbps  29.6kbps  59.2kbps MCS-4  17.6kbps  35.2kbps  70.4kbps MCS-5  22.4kbps  44.8kbps  89.6kbps
 SIM5215A _HD_V1.02 Hardware Design                                     SIM5215A _HD_V1.02   26.08.2010   13MCS-6  29.6kbps  59.2kbps  118.4kbps MCS-7  44.8kbps  89.6kbps  179.2kbps MCS-8  54.4kbps  108.8kbps  217.6kbps MCS-9  59.2kbps  118.4kbps  236.8kbps 3 Application interface All hardware interfaces except RF interface that connects SIM5215A to the customers’ cellular application platform is through a 70-pin 0.4mm pitch board-to-board connector.  Figure 1 is SIM5215A system overview.    Figure 2 is SIM5215A block diagram.    Sub-interfaces included in this board-to-board connector are described in detail in following chapters: z Power supply   z USB interface z Serial interface   z Analog audio interfaces   z SIM interface   z GPIO z ADC z LDO Power output   z PCM interface z MMC/SD interface z Camera interface z RTC z I2C interface  Electrical and mechanical characteristics of the board-to-board connector are specified in   Chapter 6. There we also order information for mating connectors.
 SIM5215A _HD_V1.02 Hardware Design                                     SIM5215A _HD_V1.02   26.08.2010   14 Figure 2:SIM5215A block diagram 3.1 SIM5215A pin description Table 5:Board-to-Board Connector pin description Power  Supply  PIN NAME  I/O  DESCRIPTION  DC CHARACTERISTICSVBAT     Six BAT pins of the board-to-board connector are dedicated to connect the supply voltage. The power supply of SIM5215A has to be a single voltage source of VBAT= 3.3V...4.2V. It must be able to provide sufficient current in a transmit burst which typically rises to 2A.  Mostly, these six pins are voltage input   Vmax= 4.2V Vmin=3.4V Vnorm=3.8V VRTC   Current input for RTC when the battery is not supplied for the system.Current output for backup battery when the main battery is present and the backup battery is in low voltage state. If not in use, left it open. Vmax=3.2V Vnorm=3.0V Vmin=1.5V Inorm= 1.1uA GND   Digital ground   Power on or power off   PIN NAME  I/O  DESCRIPTION  DC CHARACTERISTICSPOWER_ON  I  Voltage input for power on key. POWER_ON get a low level voltage for user to power on or power off the system. It has been pulled up to VILmax=0.2*VBAT VIHmin=0.6*VBAT VImax=VBAT
 SIM5215A _HD_V1.02 Hardware Design                                     SIM5215A _HD_V1.02   26.08.2010   15VBAT in module. The user should keep it to low level for at least 64mS when power on or power off the system because the system needs margin time to assert the software. Audio interfaces PIN NAME  I/O  DESCRIPTION  DC CHARACTERISTICSMIC_P MIC_N I  Positive and negative voice-band input If not in use, connect to ground through a 100N capacitor.   Audio DC Characteristics refer to chapter 3.8.4 HP_MICP  I  Auxiliary positive voice-band input, if not in use, connect to ground through a 100N capacitor.  EAR_P EAR_N O  Positive and negative voice-band output, if not in use ,left open  HPR HPL O  Auxiliary right channel and left channel voice-band output, if not in use, left open.  SPK_P SPK_N O  Loud Speaker Output, if not in use ,left open  HKADC  I  Analog Digital Converter Input   VREG_AUX  O  LDO power output  This LDO default output voltage is 2.85V, and driver current is rated for 250mA. USB PIN NAME  I/O  DESCRIPTION  DC CHARACTERISTICSUSB_VBUS   I  USB power supply input, if not in use, left open.  Vmax  =5.25 V Vmin  =4.4  V Vnorm = 5.0    V USB_DP  I/O  Plus (+) line of the differential, bi-directional USB signal to/from the peripheral device. If not in use, left open.  USB_DM  I/O  Minus (-) line of the differential, bi-directional USB signal to/from the peripheral device. If not in use, left open. They are compliant with the USB 2.0 specification. Serial interface PIN NAME  I/O  DESCRIPTION  DC CHARACTERISTICSUART_DTR  I  Data Terminal Ready, if not in use, left open. UART_RXD  I  Receive Data, which has been pulled down with a 15kR resistor to ground in module, if not in use, left open. So please don’t pull up or pull down in your application circuit.VILmin=0V VILmax=0.3*VDD_EXT*VIHmin=0.7*VDD_EXT VIHmax=VDD_EXT+0.3 VOLmin=GND VOLmax=0.2V
 SIM5215A _HD_V1.02 Hardware Design                                     SIM5215A _HD_V1.02   26.08.2010   16UART_TXD  O  Transmit Data, if not in use, left open.UART_RTS  O  Request to Send, if not in use, left open. UART_CTS  I  Clear to Send, if not in use, left open.UART_RI  O  Ring Indicator, if not in use, left open. UART_DCD  O  Data Carrier detection, if not in use, left open. Camera interface PIN NAME  I/O  DESCRIPTION  DC CHARACTERISTICSCAM_D2  I  Bit 2 of RGB or YUV D0 video component input CAM_D3  I  Bit 3 of RGB or YUV D1 video component input CAM_D4  I  Bit 4 of RGB or YUV D2 video component input CAM_D5  I  Bit 5 of RGB or YUV D3 video component input CAM_D6  I  Bit 6 of RGB or YUV D4 video component input CAM_D7  I  Bit 7 of RGB or YUV D5 video component input CAM_D8  I  Bit 8 of RGB or YUV D6 video component input CAM_D9  I  Bit 9 of RGB or YUV D7 video component input CAM_HSYNC  I  Video horizontal line synchronization signal input CAM_VSYNC  I  Vertical sync input CAM_CLK  O  master clock output CAM_PCLK  I  Pixel clock input CAM_RESET  O  Master reset out, active low CAM_STANDBY  O  Power-down mode selection “0”=Normal mode, “1”=Power-down mode VILmin=0V VILmax=0.3*VDD_EXT*VIHmin=0.7*VDD_EXT VIHmax=VDD_EXT+0.3 VOLmin=GND VOLmax=0.2V VOHmin=VDD_EXT-0.2 VOHmax=VDD_EXT  All camera pins can be configured as GPIOs. Detail description refer to chapter 3.16. USIM interface PIN NAME  I/O  DESCRIPTION  DC CHARACTERISTICSV_USIM  O  Voltage Supply for SIM card  The voltage can be selected by software to be either 1.8V or 3V USIM_DATA  I/O  SIM Data Output/Input, which has been pulled up with a 22kR resistor to V_USIM in module. So please do not pull up or pull down in your application circuit. USIM_CLK  O  SIM Clock VILmin=0V VILmax=0.3*V_USIM VIHmin=0.7* V_USIM VIHmax=V_USIM +0.3 VOLmin=GND VOLmax=0.2V
 SIM5215A _HD_V1.02 Hardware Design                                     SIM5215A _HD_V1.02   26.08.2010   17USIM_RESET  O  SIM Reset IIC interface PIN NAME  I/O  DESCRIPTION  DC CHARACTERISTICSIIC_SDA  I/O  I2C data, if not in use, left open. It has been pulled up with a 2.2kR resistor to 2.6V in module. So there is no need to pull up it in your application circuit.  IIC_SCL  O  I2C clock output, if not in use, left open. It has been pulled up with a 2.2kR resistor to 2.6V in module. So there is no need to pull up it in your application circuit.  Other interface PIN NAME  I/O  DESCRIPTION  DC CHARACTERISTICSReset  I  System reset in, active low.  Reset pin has been pulled up in SIM5215A.  Detail description refer to chapter 3.12. GPIO0/PCM_DIN  I  General Input PIN with interrupt. If not in use, left open. It also can be multiplexed as the PCM_DIN pin. GPIO1  O  Status Indicating LED Control. GPIO2/PCM_SYNC  I  General Input PIN. If not in use, left open. It also can be multiplexed as the PCM_SYNC pin. GPIO3/PCM_CLK  O  General Output PIN. If not in use, left open. It also can be multiplexed as the PCM_CLK pin. GPIO4  I  RF Control: Flight Modem switch GPIO5/PCM_DOUT  O  General Output PIN. If not in use, left open. It also can be multiplexed as the PCM_DOUTpin.VIHmin=0.7*VDD_EXT*VIHmax= VDD_EXT+0.3VOLmin=GND VOLmax=0.2V VOHmin= VDD_EXT-0.2VOHmax= VDD_EXT *Note: module internal reference supply power: VDD_Ext=2.6V 3.2 Operating modes   The following table summarizes the various operating modes, each operating modes will be referred to in the following chapters. Table 6:Overview of operating modes   Mode  Function Normal operation  Module Power Off mode   Module will go to Power off mode when the Power on pin has been pushed low for 2 Seconds.
 SIM5215A _HD_V1.02 Hardware Design                                     SIM5215A _HD_V1.02   26.08.2010   18Module sleep  Module will automatically go into sleep mode when there is no interrupt input or other operation. In this case, the current consumption of module will be reduced to the minimal level. GSM IDLE  Software is active. Module has registered to the GSM network, and the module is ready to send and receive. GSM mode GSM TALK  CSD connection is going on between two subscribers. In this case, the power consumption depends on network settings such as DTX off/on, FR/EFR/HR, hopping sequences, antenna. GPRS IDLE  Module is ready for GPRS data transfer, but no data is currently sent or received. In this case, power consumption depends on network settings and GPRS configuration (e.g. multi-slot settings). GPRS mode GPRS DATA  There is GPRS data in transfer (PPP or TCP or UDP). In this case, power consumption is related with network settings (e.g. power control level), uplink/downlink data rates and GPRS configuration (e.g. used multi-slot settings). EDGE mode  EDGE IDLE  Module is ready for data transfer in EDGE mode, but no data is currently sent or received. In this case, power consumption depends on network settings and EDGE configuration EDGE mode  EDGE DATA  There is data in transfer (PPP or TCP or UDP) in EDGE mode. In this case, power consumption is related with network settings (e.g. power control level), uplink/downlink data rates and EDGE configuration. WCDMA IDLE Module has registered to the WCDMA network, and the module is ready to send and receive. WCDMA mode WCDMA talk  Module is active in WCDMA mode. The power consumption depends on network settings. POWER DOWN  Normal shutdown is by sending the “AT+CPOF” command or using the POWER_ON pin. The power management ASIC disconnects the power supply from the base band part of the module, only the power supply for the RTC is remained. Software is not active. The serial interfaces are not accessible. Operating voltage (connected to VBAT) remains applied. Minimum functionality mode (flight mode) Use of the “AT+CFUN” command can set the module to a minimum functionality mode without remove the power supply. In this case, disable phone both transmit and receive RF circuits, that is to say ,flight mode  3.3 Power supply   The power supply of SIM5215A is from a single voltage source of VBAT= 3.3V...4.2V.    In some cases, the ripple in a transmit burst may cause voltage drops when current consumption rise typically to peak of 2A.    So the power supply must be able to provide sufficient current up to 2A.  For the VBAT input, a local bypass capacitor is recommended.    A capacitor (about 100µF, low
 SIM5215A _HD_V1.02 Hardware Design                                     SIM5215A _HD_V1.02   26.08.2010   19ESR) is recommended when one uses a Li battery.    When you use a DC supply the Capacitor must be a larger one (for example 2200u/10V), Multi-layer ceramic chip (MLCC) capacitors can provide the best combination of low ESR and small size but may not be cost effective.    A lower cost choice may be a 100 µF tantalum capacitor (low ESR) with a small (0.1 µF to 1µF) ceramic in parallel, which is illustrated as following figure. And the capacitors should put as closer as possible to the SIM5215A VBAT pins.    The following figure is the recommended circuit.   Figure 3:VBAT input  The following figure is the VBAT voltage ripple wave at the maximum power transmit phase, the test condition is VBAT=4.0V, VBAT maximum output current =2A, CA=100 µF tantalum capacitor (ESR=0.7Ω) and CB=1µF.    Figure 4:VBAT voltage drop at the maximum power transmit phase (GSM) And make sure that the capacitor is close to VBAT pins of 70 pins connector.    If a DC/DC or LDO is used for power supply of the module, you should make sure that the peak current of power supply can rise up to 2A (4.0V).    The reference design is putting one big capacitor at the output of the DC/DC or LDO, and another big capacitor beside the 70 pins connector. Note: If a DC/DC or LDO is used as power supply, besides a big capacitor close to the 70-pin connector, another big capacitor (typically a 100 µF tantalum capacitor) is suggested to be put at the output pin of the DC/DC or LDO.  3.3.1 Power supply pins on the board-to-board connector   Six VBAT pins of the board-to-board connector are dedicated to connect the supply voltage; six GND pins are recommended for grounding.    VRTC pin can be used to back up the RTC.
 SIM5215A _HD_V1.02 Hardware Design                                     SIM5215A _HD_V1.02   26.08.2010   20 3.3.2 Minimizing power losses Please pay special attention to the supply power when you are designing your applications. Please make sure that the input voltage will never drop below 3.3V even in a transmit burst during which the current consumption may rise up to 2A.    If the power voltage drops below 3.3V, the module may be switched off.    Using the board-to-board connector will be the best way to reduce the voltage drops.  You should also remove the resistance from the power supply lines on the host board or from battery pack. 3.3.3 Monitoring power supply To monitor the supply voltage, you can use the AT command(AT+CBC) which include two parameters: voltage supply status and voltage value (in mV).   It returns the battery voltage of 1-100 percent of capacity and actual value measured at VBAT and GND. The voltage is continuously measured at intervals depending on the operating mode.  The displayed voltage (in mV) is averaged over the last measuring period before the AT command was executed.  3.4 Power up and power down scenarios 3.4.1 Turn on SIM5215A SIM5215A can be turned on by various ways, which are described in the following chapters: z Via POWER_ON pin: starts normal operating mode;  POWER_ON has been pulled up to VBAT in module. You can turn on the SIM5215A by driving the POWER_ON to a low level voltage for period time. The power on scenarios illustrate as following figure.                         Figure 5: Timing of turn on system
 SIM5215A _HD_V1.02 Hardware Design                                     SIM5215A _HD_V1.02   26.08.2010   21Note1: Ton >= 64ms. Note2: Commonly, the AT command can be set 2-3S after the SIM5215A is powered on.  If VBAT was supplied to SIM5215A, SIM5215A could be automatically powered on by connecting the Power ON pin to Low level directly.    In automatically powering on mode, it is suggested that the SIM5215A should reset by RESET pin after power on.    Below is the reference circuit.                       Figure 6: Automatic power on Note: The POWER_ON has been pulled up with a 250kR resistor to VBAT in module.    Make sure that VILmax=0.2*VBAT, and the value of R1 above can be changed as you want.   In automatically powering on mode, it is suggested that the SIM5215A should reset by RESET pin after power on.   3.4.2 Turn off SIM5215A Following procedure can be used to turn off the SIM5215A: z Normal power down procedure: Turn off SIM5215A using the POWER_ON pin   z Normal power down procedure: Turn off SIM5215A using AT command   3.4.2.1 Turn off SIM5215A using the POWER_ON pin (Power down) You can turn off the SIM5215A by driving the POWER_ON to a low level voltage for period time. The low level period of the POWER_ON is about 64mS.                 This procedure will let the module to be logged off from the network and allow the software to enter into a secure state and save data before completely disconnecting the power supply. 3.4.2.2 Turn off SIM5215A using AT command You can use AT command “AT+CPOF” to turn off the module.  This command will let the module to be logged off from the network and allow the software to enter into a secure state and save data before completely disconnecting the power supply. After this moment, the AT commands can not be executed.  The module enters the POWER DOWN mode, only the RTC is still active.    Please refer to AT command manual for details of the AT command “AT+ C PO F”.
 SIM5215A _HD_V1.02 Hardware Design                                     SIM5215A _HD_V1.02   26.08.2010   223.4.2.3 Under-voltage automatic warning Software will constantly monitor the voltage applied on the VBAT, if the measured battery voltage is no more than 3.4V, the following URC will be presented:     warning! voltage is low : 3.3v Note: Under-voltage automatic warning function default is disabled. One can enable it by AT+CVALARM. 3.4.2.4 Under-voltage automatic shutdown Besides the Under-voltage automatic warning, system will monitor the working voltage and power off the module if the voltage is lower to a specified value which can be set by AT+CPMVT in order to protect the module. Note: this feature default is disabled, One can use AT+CPMVT to active it. At this moment, no more AT commands can be executed.    The module will be logged off from the network and enters POWER DOWN mode, only the RTC is still active (if backup battery is connected to VRTC pin). 3.5 Power saving There are two methods to achieve SIM5215A module extreme low power. “AT+CFUN” is used to set module into minimum functionality mode and GPIO4 hardware interface signal can be used to set system to be Flight mode (Close RF). 3.5.1 Minimum functionality mode   Minimum functionality mode reduces the functionality of the module to a minimum and, thus, minimizes the current consumption to the lowest level.    This mode is set with the “AT+CFUN” command which provides the choice of the functionality levels <fun>=0,1,4  z 0: minimum functionality, (same as CFUN=4,disable both transmit and receive RF circuits of the phone); z 1: full functionality (Default); z 4: disable both transmit and receive RF circuits of the phone;  If SIM5215A has been set to minimum functionality by “AT+CFUN”, then the RF function function will be closed, in this case, the serial port is still accessible, but all AT commands referred to RF function or SIM card function will not be accessible.    When SIM5215A is in minimum functionality or has disabled all RF functionality by “AT+CFUN”, it can return to full functionality by “AT+CFUN”, not need to reset module.  NOTE: In fact, Flight mode is identical with minimum functionality mode .Different titles lie
 SIM5215A _HD_V1.02 Hardware Design                                     SIM5215A _HD_V1.02   26.08.2010   23on different viewpoint. Flight mode is titled from visual application; however, minimum functionality is derived from normal 3GPP at-command spec.  3.5.2 Flight mode    Through GPIO4 signal control SIM5215A module to enter or exit the Flight mode in customer applications.    In Flight mode, SIM5215A closes RF function.    If GPIO4 is left open, SIM5215A enters normal mode.    But it is suggested that GPIO4 should not be left open. Because GPIO4 is sensitive to ESD, so bidirectional ESD protection component is suggested to add on GPIO4.                       Figure 7:  Flight mode switch Table 7:logic of flight mode switch    3.5.3 Sleep Mode   If periphery equipment stops working, and there is no on air or audio activity required and no hardware interrupt (such as GPIO interrupt or data on serial port), SIM5215A will enter SLEEP mode automatically.    In this mode, SIM5215A can still receive paging or SMS from network.    If USB interface of SIM5215A is connecting with host CPU,and host CPU support USB suspend mode, SIM5215A    could enter sleep mode. Otherwise SIM5215A could not enter sleep mode.  GPIO4 Status  Module Action Low Level  Flight Mode: RF is closed. High Level  Normal Mode: RF is working.
 SIM5215A _HD_V1.02 Hardware Design                                     SIM5215A _HD_V1.02   26.08.2010   243.5.4 Wake up SIM5215A from Sleep Mode When SIM5215A is in SLEEP mode, the following method can wake up the module. z USB interface active z Receive a voice or data call from network to wake up SIM5215A. z Receive a SMS from network to wake up SIM5215A. z Receive a interrupt signal from GPIO0 z GPIO4 state change. z Receive AT command from UART. z UART DTR signal changed. Normally DTR pin will stay high but in certain condition when serial port is used in Null Modem(3-line mode). When host wants to wake up SIM5215A, it can pull down DTR for about 12ms(since SIM5215A has a debounce time of 10ms for mistaken interrupt checking). Then DTR will trigger an interrupt which will finally cause SIM5215A to be waken up from sleep mode. Note: One can enable/disable such function by AT+CDTRISRS, also One can configure the DTR’s trigger condition by AT+CDTRISRMD(only level trigger condition has debounce time). Currently the function is enabled by default and the trigger condition is low level. Please reference document [23] for detailed information of Waking_up_Application_Note.  WARNING!!!: when DTR has been pulled down/up long enough to trigger the interrupt one must recover DTR to original status or the interrupt will be triggered all the time and SIM5215A may crash.  3.6 RTC backup The RTC (Real Time Clock) power supply of module can be provided by an external battery or a battery (rechargeable or non-chargeable) through the VRTC (PIN11) on the board-to-board connector.    You need only a coin-cell battery or a super-cap to VRTC to backup power supply for RTC.    The discharge current is smaller than 10uA.    The module could update local time based on universal time and time zone from network. (This feature must be supported by the network).   If this feature is used, please refer to AT command AT+CTZU and AT +CTZR.  Note: The VRTC default state can be designed to a NC pin in your circuit.    If you need to use the VRTC, You may connect the VRTC pin to a battery or a capacitor.  The following figures show various sample circuits for RTC backup.
 SIM5215A _HD_V1.02 Hardware Design                                     SIM5215A _HD_V1.02   26.08.2010   25 Figure 8: RTC supply from non-chargeable battery   Figure 9: RTC supply from rechargeable battery       Figure 10: RTC supply from capacitor  z Li-battery backup Rechargeable Lithium coin cells are also small in size, but have higher capacity than the double layer capacitors resulting in longer backup times.    The coin cell normal voltage should be 3.0V.
 SIM5215A _HD_V1.02 Hardware Design                                     SIM5215A _HD_V1.02   26.08.2010   26 Typical charge curves for each cell type are shown in following figures.  Note that the rechargeable Lithium type coin cells are generally pre-charged from the vendor.   Figure 11: Seiko MS518 Charge and discharge Characteristic Note: Gold-capacitance backup Some suitable coin cells are the electric double layer capacitors.    They have a small physical size (6.8 mm diameter) and a nominal capacity of 0.2 F to 0.3 F, giving hours of backup time.  3.7 Serial interface   SIM5215A provides an unbalanced asynchronous serial port.    The module is designed as a DCE (Data Communication Equipment), following the traditional DCE-DTE (Data Terminal Equipment) connection, the module and the client (DTE) are connected through the following signal (as following figure shows).
 SIM5215A _HD_V1.02 Hardware Design                                     SIM5215A _HD_V1.02   26.08.2010   27 Figure 12: Interface of serial ports Serial port z Port/TXD @ Client sends data to the RXD signal line of module z Port/RXD @ Client receives data from the TXD signal line of module  All pins of all serial ports have 8mA driver, the logic levels are described in the following table Table 8: Logic levels of serial ports pins Parameter  Min Max   Unit Logic low input  0  0.3*VDD_EXT  V Logic high input  0.7 *VDD_EXT VDD_EXT +0.3  V Logic low output  GND  0.2  V Logic high output    VDD_EXT -0.2  VDD_EXT  V Note: VDD_EXT=2.6V, is module internal IO reference voltage.  SIM5215A provides an AT command (AT+CSUART) to support Null modem. Null modem mode uses two lines (RXD, TXD (GND not comprised)) to setup communication between devices. The lines connection is shown as below.
 SIM5215A _HD_V1.02 Hardware Design                                     SIM5215A _HD_V1.02   26.08.2010   28 Figure 13: Null modem mode of serial ports If serial port is used in Null Modem, the pin “RI” can be used as an interrupt pin.    Normally it will stay high but in certain condition such as SMS receiving, incoming voice (CSD, video) call or URC reported, the pin “RI” will be set low to inform the master, and it will stay low until the master clear this interrupt with AT command (AT+CRIRS).  If using seven lines to setup communication between devices, the pin “RI” is different.    First it stays high, when a voice (CSD) call coming, the pin “RI” is set to low for about 5900ms, then it is set high again about 100ms. The situation will repeat until that the call is answered or hung up.    After the call is answered or hung up, the pin “RI” is set high.  Functions of serial port supporting on SIM5215A are as following:   z Standard/Null Modem mode on Serial Port Interface. z Contains Data lines TXD and RXD, State line RTS and CTS z Serial Port can be used for CSD, PS service and send AT command for controlling module.   z Serial Port is a high-speed port.    It supports the communication rate as following: 300, 600, 1200, 2400, 4800, 9600, 19200, 38400, 57600, 115200, 230400, 460800, 921600, 3200000, 3686400, 4000000 Default band rate is 115200bps.  And Data bits=8, Parity=None, Stop bits=1, Flow control=None. NOTE:  1 If you need to use a speed higher than 115200, you should consider the length of RS232 line and the speed support on your RS232 port. 2 Though the connector has seven lines for serial port, but the line: DCD, DTR are not implemented and reserved for future use. 3 The line RI behaves the same as the standard when using four-line mode, but in two-line mode its action is not standard which is depicted above.
 SIM5215A _HD_V1.02 Hardware Design                                     SIM5215A _HD_V1.02   26.08.2010   29     Default setting in HyperTerminal software is as the following figure.   Figure 14: Settings of serial ports  3.8 Audio interfaces The module provides three analogy audio output channels and two analogy audio input channels. MIC_P/N and HP_MICP, are used for microphone (two analogy audio input channels), EAR_P/N, HPR/HPR and SPK_P/N are used for audio output (three analogy audio output channels). There are some AT Commands to control audio channel switch and other parameters, please refer to ATC manual.  Note: Please reference document [21] for detailed information of Audio Application Note.  Table 9: Audio interface signal
 SIM5215A _HD_V1.02 Hardware Design                                     SIM5215A _HD_V1.02   26.08.2010   30It is suggested that you adopt one of two following reference circuits in order to get well speaker effect.    The different audio signals have to be routed according to different signal layout rules as in following figures: 3.8.1 Speaker interface configuration  Figure 15: Speaker interface configuration Because SPK_P and SPK_N are outputs of Class-D audio amplifier, optional EMI filtering is shown at Figure 15; these components (two ferrite beads and two capacitors) can be added to reduce electromagnetic interference.    If used, they should be located near the SPK_P and SPK_N. Considerable current flows between the audio output pins and the speaker, so wide PCB traces are recommended (~ 20 mils). Audio channel  Pin name  Pin No  Function MIC_P  43  MIC anode input MIC_N  44  MIC cathode input EAR_P  25  Receiver output anode NORMAL ( default ) EAR_N  26  Receiver output cathode HP_MICP  42  Headset MIC anode input HPR  27  Headset right speaker   HEADSET HPL  28  Headset left speaker MIC_P  43  MIC anode input MIC_N  44  MIC cathode input SPK_P  23  Loudspeaker anode Hand free SPK_N  24  Loudspeaker cathode
 SIM5215A _HD_V1.02 Hardware Design                                     SIM5215A _HD_V1.02   26.08.2010   31 Figure 16: Receiver interface configuration 3.8.2 Microphone interfaces configuration  Figure 17: Microphone interface configuration NOTE : SIM5215A has integrated internal MIC bais circuit. There is no need to pull the MIC1_P and MIC_M up to the external power, because they have been pulled up in the Module. MIC_P and MIC_N should be layout differential.
 SIM5215A _HD_V1.02 Hardware Design                                     SIM5215A _HD_V1.02   26.08.2010   323.8.3 Earphone interface configuration  Figure 18: Earphone interface configuration 3.8.4 Referenced electronic characteristic Table 10: MIC Input Characteristics Parameter  Min  Typ  Max  Unit Working Voltage  1.2  1.60  2.2  V Working Current  70   400  uA External Microphone Load Resistance 1.2  2.2   k Ohms Table 11: Audio Output Characteristics Parameter  Min  Typ  Max  Unit load Resistance  27  32   Ohm Normal Output(EAR_P,EAR_N) Differential Output power   70   mW Single Ended  load Resistance  12  16   Ohm Differential  load Resistance  27  32   Ohm Auxiliary Output(HPR,HPL) Single Ended Output power   21.6   mW
 SIM5215A _HD_V1.02 Hardware Design                                     SIM5215A _HD_V1.02   26.08.2010   33Table 12: Speaker Output Characteristics Parameter  Min  Typ  Max  Unit Quiescent Current   6.2   mA Output power(1KHz)    500   mW 3.8.5 Programming characteristic 3.8.5.1 Setting Audio Parameters by AT Commands The audio modes 1 to 3 can be temporarily adjusted according to the AT command parameters listed in the table below.    The audio parameters are set with the AT commands AT+CMICAMP1, AT+SIDET, AT+CTXGAIN, AT+CRXGAIN, AT+CTXVOL, AT+CTXFTR, AT+CRXFTR as we l l a s AT + CLVL ,AT +C VLVL ,  AT+ VM UT E , AT +M I CM UT,  AT+ CS DV C, a nd  AT +C PTON E.   For a model of how the parameters influence the audio signal path see Section 3.8.5.2.  Table 13: Audio parameters adjustable by AT command Parameter   Influence to   Range   Gain range   Calculation   AT command micAmp1   MICP/MICN analogue amplifier gain before ADC0…1  0…24dB  2 steps    AT+CMICAMP1txVol   Digital gain of input signal after ADC 0,  1...65535  Mute, -84...+12dB  20 * log (txVol/ 16384)  AT+CTXVOL txGain   Digital gain of input signal after summation of sidetone 0,  1...65535  Mute, -84...+12dB  20 * log (txGain/ 16384)  AT+CTXGAIN txFilter  Input PCM 13-tap filter parameters, 7 values 0...65535   ---  MATLAB calculate AT+CTXFTR rxGain   Digital gain of output signal after summation of sidetone 0,  1...65535  Mute, -84...+12dB  20 * log (rxGain/ 16384)  AT+CRXGAIN rxVol   Digital Volume of output signal after speech decoder, before summation of sidetone and DAC -300…300  dbm   -300…300dbm  AT+CLVL AT+CVLVL AT+CRXVOL stGain   Digital attenuation of sidetone 0, 1...65535  Mute, -96...0dB 20 * log (stGain/ 16384) -12   AT+SIDET rxFilter  Output PCM 13-tap filter  0...65535   ---  MATLAB  AT+CRXFTR
 SIM5215A _HD_V1.02 Hardware Design                                     SIM5215A _HD_V1.02   26.08.2010   34parameters, 7 values  calculate NOTE: if you want to better experience on audio, you should modify these parameters for your own electronic and mechanical design of audio part.    The 13-tap filter parameter could be debugged and calculated by MATLAB.  3.8.5.2 Audio Programming Model The audio programming model shows how the signal path can be influenced by varying AT command parameters. Parameters <micAmp>, <txGain> , <txVol>, <txFilter>,<rxGain>, <stGain> ,<rxVol> and <rxFilter> can be adjusted with corresponding AT commands. For more information on the AT commands and parameters see Section 3.8.5.1. NOTE: Please reference document [1] for detailed information of each AT command.    Figure 19: Audio programming model Note: There is no AT+CMIC in SIM5215A, because there is only one analogue hardware amplifier which is supported by AT+CMICAMP1. 3.8.5.3 Audio characteristics The electrical characteristics of the voice band part depend on the current audio mode (device number) set with the AT+CSDVC command. All values are noted for default gains.  Table 14: Audio Characteristics Audio Device no. AT+CSDVC=   1   2   3   Name   Handset   Headset  Speaker phone
 SIM5215A _HD_V1.02 Hardware Design                                     SIM5215A _HD_V1.02   26.08.2010   35Purpose   Default for DSB with Votronic handset Mono Headset  handheld speaker-phoneTX-Filters   Adjustable  Adjustable  Adjustable RX-Filters   Adjustable  adjusted to fit artificial ear type 3.2 low leakageAdjustable  Adjustable  500 Hz HP Gain setting:    Adjustable  Adjustable  Adjustable micAmp1  0(0 dB)  0(0 dB)  0(0 dB) txGain  23143  51811  32690 txVol  16384  16384  16384 Default MIC path Parameters txFilter [tap0~6] 0xff33, 0x05d8, 0xf488, 0x0af3, 0x24bb, 0xca42, 0x7c95 0,0,0, 0,0,0,0 0xfff3, 0x001d, 0xffb9, 0x016b, 0xfa71, 0x0c08, 0x309a rxGain  11599  6523  41155 rxVol  -100  -100  0 stGain  2304  1024  0 Default Output path Parameters  rxFilter [tap0~6] 0xff00, 0xfac9, 0x0571, 0xf365, 0x0bc2, 0xf2bb, 0x533a 0,0,0, 0,0,0,0 0xfd3f, 0xfc4f, 0xfb60, 0xfa27, 0xf97c, 0xf920, 0x3934  Power supply VMIC    ON during call    ON during call    ON during call   Sidetone  Adjustable   Adjustable   Adjustable  Volume control    Adjustable   Adjustable   Adjustable  Echo canceller Filter length Behaviour optimized for   ON 16ms low echo  ON 16ms moderate echo  ON 64ms high echo Non Linear Processor with Comfort Noise Generator  ON  ON  ON Noise Reduction    -12dB  -12dB  -12dB MIC input signal for 0dBm0, 1 f = 1024 Hz    17.5mV  5mV  5mV EP output signal in mV rms. @ 0dBm0, 1024 Hz, no load (default gain) / @ 3.14 dBm0   508mV 2.1Vpp  407mV 1.68Vpp  1220mV 4.5Vpp Sidetone gain at default settings  25.0dB  25.3 dB  -∞ dB
 SIM5215A _HD_V1.02 Hardware Design                                     SIM5215A _HD_V1.02   26.08.2010   363.8.5.4 Adjust the sound level by AT+CVLVL   There are two adjustable amplifiers on audio signal output path: <rxVol>, <rxGain>. Four AT commands are provided for tune them.. <rxVol>: AT+CLVL, AT+CVLVL,AT+CRXVOL <rxGain>: AT+CRXGAIN AT+CRXVOL is used for fine tuning for <rxVol>.  AT+CLVL and AT+CVLVL are used for coarse tuning for <rxVol>.    AT+CVLVL changes the sound level values of the command CLVL. Now we provide 5 levels for each audio channel. The level 0 is muted and it can not be changed by CVLVL. Levels 1 to 4 are supported to change the value of sound level. CVLVL command could let you change these four levels. The bigger the number presents the louder the voice. And the range of each level is -5000 to 5000. NOTE: This command influences digital volume of output signal after speech decoder. Please check the reference document [1] for detailed information of each AT command.  3.9 USIM card interface 3.9.1 USIM card application You can use AT Command to get information in USIM card.    For more information, please refer to document [1]. The universal subscriber identification module (USIM) is a smart card for UMTS/GSM cellular applications.  The USIM provides the required subscription information to allow the mobile equipment to attach to a GSM or UMTS network.  The USIM also provides the subscriber's verification procedures as well as authentication methods for network authentication during the attach procedures.  The USIM card can be inserted into any UMTS/GSM USIM equipped handset, allowing the user to receive or make calls, and receive other subscribed services from any USIM equipped handset, thus enabling more handset independence for the user. Both 1.8V and 3.0V SIM Cards are supported. The SIM interface is powered from an internal regulator in the module having nominal voltage 2.8V.    All pins reset as outputs driving low.    Logic levels are as described in the table below. Table 15: USIM interface
 SIM5215A _HD_V1.02 Hardware Design                                     SIM5215A _HD_V1.02   26.08.2010   37Table 16: Signal of USIM interface (board-to-board connector) Following is the reference circuit of the USIM interface.    We recommend using an Electro-Static discharge device ST (www.st.com ) ESDA6V1W5 or ON SEMI (www.onsemi.com ) SMF05C for “ESD ANTI”.   If you remove ESD components, please replace them with 33pF and 10pF capacitors, it’s good for EMI performance.    Note that the USIM peripheral circuit close to the USIM card socket.  You can select the 6 pins USIM card.    The reference circuit about 6 pins USIM card illustrates as in the following figure.  Figure 20: USIM interface reference circuit with 6 pins USIM card *Note:  USIM_DATA has been pulled up with a 22kR resistor to V_USIM in module.  So please do not pull up or pull down in your application circuit.  As shown in above figure, SMF05C is used for ESD protection for SIM interface.    And 220nF capacitor on V_USIM is used to reduce interference 3.9.2 Design considerations for USIM card holder   For 6 pins USIM card, we recommend to use Amphenol C707 10M006 512 2.   You can visit http://www.amphenol.com for more information about the holder.  Pin  Signal  Description 57  V_USIM  USIM Card Power output depends automatically on USIM mode,one is 3.0V±10%, another is 1.8V±10%. Current is about 10mA. 56  USIM_DATA  USIM Card data I/O, which has been pulled up with a 22kR resistor to V_USIM in module.    So please do not pull up or pull down in your application circuit. 12  USIM_CLK  USIM Card Clock 13  USIM_RESET  USIM Card Reset
 SIM5215A _HD_V1.02 Hardware Design                                     SIM5215A _HD_V1.02   26.08.2010   38  Figure 21:    Amphenol C707 10M006 512 2 SIM card holder Table 17: Pin description (Amphenol SIM card holder) Pin  Signal  Description C1  USIM_VDD SIM Card Power supply, it can identify automatically the SIM Card power mode,one is 3.0V±10%, another is 1.8V±10%. Current is about 10mA. C2  USIM_RST  SIM Card Reset. C3  USIM_CLK  SIM Card Clock. C5  GND  Connect to GND. C6  VPP  Connect to USIM_VDD C7  USIM_DATA  SIM Card data I/O.  3.10 I2C interface SIM5215A contains an I2C interface.It is used for connecting peripheral equipment. Use AT Command to read/write values of I2C peripheral equipment.  AT+CRIIC is used for read values from register of I2C peripheral equipment. AT+CWIIC is used for write values to register of  I2C peripheral equipment Because I2C has been pulled up in SIM5215A, there is no need to be pulled up by customer. Table 18: PIN define of IIC interface *Note:IIC_SDA and IIC_SCL have been pulled up with two 2.2kR resistors to 2.6V in module. So there is no need to pull them up in your application circuit. Pin   Name  Function  Lever 47  IIC_SDA  Serial interface data input and output   46  IIC_SCL  Serial interface clock input
 SIM5215A _HD_V1.02 Hardware Design                                     SIM5215A _HD_V1.02   26.08.2010   393.11 USB interface SIM5215A supports high and full speed universal serial bus (USB) interface, and mode of USB can be switched by AT command ( AT+CUSBSPD ) This interface is compliant with the USB 2.0 specification.    The high speed is up to 480Mbps. so please pay attention to influence of junction capacitance of ESD component on USB data lines.   Typically, the capacitance value should be less than 4pF @1MHz. Links to these and related specifications can be found at www.usb.org  Table 19: USB PIN connect              Input voltage scope( V ) Name  PIN( B to B)    Min  Type  Max USB_VBUS  9  4.4  5.0  5.25 USB_DP  60 USB_DM  59  They are compliant with the USB 2.0 specification. GND  58       VBUSD+GNDD-VBUSD+D-GNDSeries A , BorMini-B Receptacle Figure 22:    USB interface    Currently SIM5215A supports the USB suspend & resume mechanism which can help to save much current.    If no transaction on USB bus then SIM5215A will enter to suspend mode and when some events happens (such as incoming call or SMS received) during the suspend mode then SIM5215A will resume automatically.  Note: when use the Mini-B it has no ID line. Note:Two limitations on ESD protection: less than 4 pF and VBUS not to rail.
 SIM5215A _HD_V1.02 Hardware Design                                     SIM5215A _HD_V1.02   26.08.2010   403.12 Module Reset SIM5215A also have a RESET pin (PIN29) input, When should reset the module, one can push the RESET pin to low and the module reset. Because the Reset pin has been pulled up in SIM5215A, there is no need to pull it up in application circuit.    The internal circuit about RESET pin is shown below.  NOTE:50ms<t<200ms. In order to improve the ESD of Reset pin, the bidirectional ESD component is suggested to be used on Reset pin.   NOTE: In automatically powering on mode, it is suggested that the SIM5215A should reset by RESET pin after power on. 3.13 General purpose input & output (GPIO) SIM5215A provides a limited number of General Purpose Input/Output signal pin.    Please check the following table: Table 20: GPIO Pins of SIM5215A GPIO0 is used for interrupt pin, default triggering mechanism is level trigger, and low level will trigger interrupt. After interrupt, SIM5215A would send out Alarm information to host CPU. Please Refer to “AT Command Manual”. GPIO1 is used to control Status LED, the LED driving circuit of GPIO1 is shown below, and status table is Table 23. Pin   Name   Direction  Function 65  GPIO0  Input, interrupt Input Port with interrupt/PCM_DIN Use AT Command to set interrupt triggering mechanism & polarity . 10  GPIO1  Output  used as status LED driver 30  GPIO2  Input  General Purpose Input Port without interrupt/PCM_SYNC 31  GPIO3  Output  General Purpose Output Port (default value: Low Level)/PCM_CLK 32  GPIO4  Input  RF Control Interrupt:Flight Mode Switch 33  GPIO5  Output  General Purpose Output Port (default value: Low Level)/PCM_DOUT
 SIM5215A _HD_V1.02 Hardware Design                                     SIM5215A _HD_V1.02   26.08.2010   41 Figure 23:  status LED circuit   Notes: 300R Resistor’s value depends on LED.    And status indicating table is as follow. Table 21:meanings of status LED   Status  Data  Voice Always On  Searching Network  Searching Network/Call Connect 200ms ON, 200ms OFF  Data Transmit       800ms ON, 800ms OFF  Registered network  Registered Network Off  Power Off GPIO4 can be used to control RF close or on, the Flight Mode Switch logic table is shown below. You can use AT Command to read or to write GPIO2, GPIO3, GPIO5 status (High or Low level). Table 22:Logic of GPIO4       Use AT Command to read or write GPIO2, GPIO3, GPIO5 status (High or Low level).  NOTE:  For SIM5215A, GPIO0, GPIO2, GPIO3 and GPIO5 can be multiplex function, you can use them as PCM interface to connect extend codec.    Please refer section 3.18 and document [1] for detail information.  GPIO4 Status  Module Action L  Flight Mode: RF is closed. H  Normal Mode: RF is working.
 SIM5215A _HD_V1.02 Hardware Design                                     SIM5215A _HD_V1.02   26.08.2010   423.14 ADC interface SIM5215A has an analog-to-digital converter (ADC) that is available for digitizing analog signals such as battery voltage, temperature and so on, it is on PIN 30, namely HKADC0, This HKADC0 is 8 bit successive-approximation circuit, and performance specification is shown in the following table: Table 23:ADC Characteristics Specification   Min  Typ  Max  Unit  Comments/Conditions Resolution   8   Bits   differential nonlinearity -4   +4  LSB Integral nonlinearity    -8   +8  LSB Gain Error  -2.5   +2.5  % Offset Error  -4   +40  LSB . Analog Vdd = ADC reference   300 kHz - 1.2 MHz sample rate Input Range  GND   2.2  V   3dB input bandwidth  2500      Source resistance = 50 Ω Input serial resistance  2    kΩ Sample and hold switch resistance Input capacitance   53   pF   Power-down to wakeup  9.6  19.2  μs    One can introduce a signal into this ADC pin directly and use AT+CADC to get the raw data value between 0 and 255 which can then be transformed to any other type such as voltage, temperature etc. Note: if the signal is voltage then the voltage value must no more than 2.2V. Show an application sample: You can use it as a temperature ADC channel, too.    The reference design of a temperature ADC circuit is as the figure below.    R1 is 0Ω, R2 is 47 kΩ and R3 is 68 kΩ for reference. ,,the return value is supposed to 158 by AT+CADC, and you can use some arithmetic to translate “158” to a specifically temperature.
 SIM5215A _HD_V1.02 Hardware Design                                     SIM5215A _HD_V1.02   26.08.2010   43 Figure 24:ADC interface used for temperature sampling reference circuit  3.15 LDO power output SIM5215A has a LDO power output, it is PIN 40, namely VREG_AUX.  This LDO default output voltage is 2.85V, and the driver current is rated for 250mA.    This LDO could be used as a power supply for SD card, and the SD card data/command lines can also been pulled up by it. One can switch the LDO by AT+CVAUXS also one can set the LDO’s output voltage by AT+CVAUXV. NOTE:  SIM5210 has no such pin. This is a difference between SIM5215A and SIM5210.  3.16 Camera module interface SIM5215A provides a camera module interface for supporting camera and video phone functions. If you do not use the camera interface, you can configure these pins as configurable GPIOs. Please refer the AT command Document (AT+CCGSWT). SIM5215A support both digital and analog sensor (NTSC or PAL composite signals output), YUV and RGB data format.    When using analog sensor, you need to use AK8856 (currently we supported) to decode NTSC or PAL composite signals into digital data first and then transmit the digital data into camera interface. Note: When you use a YUV output sensor, you should connect the sensor data output pin(OV7670 : data0~data7; OV2640 and OV7725 : data2~data9) to SIM5215A  CAM_D2~CAM_D9. The camera module interface consists of the following:
 SIM5215A _HD_V1.02 Hardware Design                                     SIM5215A _HD_V1.02   26.08.2010   44■ 8 bit data bus for the pixel data information ■ Horizontal and vertical synchronization signals ■ 2 wire I2C bus as a control path between the SIM5215A module device and the camera module The following table is the pin definition.   Table 24: PIN define of sensor interface  We have tested several kinds of digital sensors, such as OV2640, OV7670,OV7725 and a NTSC/PAL digital video decoder named AK8856 (it can decode NTSC or PAL composite video signals into digital video data, and with AK8856 you can use analog sensor as video source) . Software must be adjusted when use other kinds of sensors.    Customer can contact us and give us your request.    The power supply of the sensor should be supplied by customer.   Pin   Name  Function 15  CAM_D2  Bit 0 of RGB or YUV D0 video component output 54  CAM_D3  Bit 1 of RGB or YUV D1 video component output 16  CAM_D4  Bit 2 of RGB or YUV D2 video component output 53  CAM_D5  Bit 3 of RGB or YUV D3 video component output 17  CAM_D6  Bit 4 of RGB or YUV D4 video component output 52  CAM_D7  Bit 5 of RGB or YUV D5 video component output 18  CAM_D8  Bit 6 of RGB or YUV D6 video component output 51  CAM_D9  Bit 7 of RGB or YUV D7 video component output 19  CAM_HSYNC  Video horizontal line synchronization signal 50  CAM_VSYNC  Vertical sync output 21  CAM_CLK  master clock input 49  CAM_PCLK  Pixel clock output 48  CAM_RESET  Master reset input, active low 47  IIC_SDA  Serial interface data input and output 46  IIC_SCL  Serial interface clock input 20  GND  Ground 22  CAM_STANDBY  Power-down mode selection “0”=Normal mode, “1”=Power-down mode
 SIM5215A _HD_V1.02 Hardware Design                                     SIM5215A _HD_V1.02   26.08.2010   45 Figure 25:  Camera module interface NOTE:The data and clock lines of camera are sensitive for the capacitors. Generally the capacitance of the ESD component is too big, if those ESD components are put on to the parallel line then the signal will fade a lot.   In order to improve the ESD performance, some 10pF capacitor can be put on data and clock lines for ESD. If one like to choose smaller capacitance ESD component, it should be smaller than 10pF.     Figure 26:  Camera module interface with analog sensor
 SIM5215A _HD_V1.02 Hardware Design                                     SIM5215A _HD_V1.02   26.08.2010   46*NOTE:STANDBY pin of SIM5215A is used to control the powering down or on of camera module. So when one designs application circuit, one should pay attention to the polarity of STANDBY. Default polarity of SIM5215A is shown below: LOW: normal operation HIGH: power-down   In Figure 26, the polarity of AK8856 power down is contrary to that of SIM5215A STANDBY, so one must use a NPN triode to reverse the polarity of SIM5215A and connect AK8856. If you do not use the camera interface you can configure these pins to configurable GPIOs. Please refer the AT command Document (AT+CCGSWT). 3.17 MMC/SD card interface SIM5215A provides one MMC/SD card interface.  The SIM5215A acts as a HOST.  The SIM5215A device has a 4-bit SD interface.    It supports 4 bits of data and a command signal.    In addition, a clock output is provided by the SIM5215A to be used as SD_CLK, or MMC_CLK. This clock is designed to be used with the MMC/SD interface and is what customers should use with the MMC/SD cards.  A LDO power output is provided by the SIM5215A for the power supply of MMC/SD card, it is PIN 40, name VREG_AUX.    This LDO default output voltage is 2.85V, and driver current is rated for 250mA.  Meanwhile data lines can be pulled up by VREG_AUX. The reference circuit of MMC/SD card interface is shown in Figure 27. The 10KR pull-up resistors on data and clk lines are necessary.    The 33pF capacitor is used to reduce RF interference.    To get good ESD performance, some ESD components should be added beside the SD/MMC card holder.     The following features are implemented: ■ Supports 4-bit SD, 1-bit SD, and 1-bit MMC interface ■ SW-configurable edge latching (falling or rising) ■ SW-configurable data and command values change (rising or falling edge) ■ Clock-gating for power saving (and a power-saving option to always turn the clock off when bus is idle) ■ Flow control option to prevent overflow and underflow ■ SD_CLK output up to 50 MHz Following figure illustrate and describe the MMC/SD interface.
 SIM5215A _HD_V1.02 Hardware Design                                     SIM5215A _HD_V1.02   26.08.2010   47 Figure 27: MMC/SD interface As mentioned, the MMC/SD interface supports SD according to the SD physical layer specification 2.0, up to 4-bit data mode.    It is also capable of supporting 1-bit MMC according to MCC specification 3.31.    While the same hardware controller is used, the initialization for SD cards and MMCs are different.    SIM5215A will auto-detect which card is inserted (SD or MMC, or no card) and will proceed accordingly.   Table 25: MMC/SD pin of SIM5215A voltage scope( V ) Name  Direction               Pin   On board-to-board connector  Min  Type  Max SD_DATA0  Input /Output  36  2.7     2.85  3.0 SD_DATA1  Input /Output  37  2.7     2.85  3.0 SD_DATA2  Input /Output  38  2.7     2.85  3.0 SD_DATA3  Input /Output  39  2.7     2.85  3.0 SD_CLK  Output  34  2.7     2.85  3.0 SD_CMD  Output  35  2.7     2.85  3.0 VREG_AUX  Output  40  2.7    2.85  3.0  Table 26 : MMC/SD pin connector Name  SD card  MMC card SD_DATA0  SD_DATA0  MMC_data SD_DATA1  SD_DATA1  NC SD_DATA2  SD_DATA2  NC
 SIM5215A _HD_V1.02 Hardware Design                                     SIM5215A _HD_V1.02   26.08.2010   48SD_DATA3  SD_DATA3  NC SD_CLK  SD_CLK  MMC_CLK SD_CMD  SD_CMD  MMC_CMD VREG_AUX  SD_VDD  MMC_VDD  Note:  SD card interface function is supported by SIM5215A software. You can use VREG_AUX for power supply of SD card and as the pull up power for data lines. 3.18 PCM Interface SIM5215A provides hardware PCM interface for external codec.  PCM interface pins are multiplex on GPIOs(default setting).    Use AT+CPCM command to change pins function between PCM function and GPIOs.If enbale PCM function ,AT+CPCM command can be used to configure the PCM mode user want. Also the slot of PCM can be configured by AT+CPCMSLOT. SIM5215A PCM interface can be used in two modes:   1) the default mode is its auxiliary PCM (8 kHz long sync mode at 128kHz clk);   2) the other mode is its primary PCM (8 kHz short sync mode at 2048 kHz clk).     In short-sync (primary PCM) mode, the SIM5215A can be a master or a slave. In long-sync (auxiliary PCM) mode, the SIM5215A is always a master; there is no slave support. SIM5215A support 3 PCM formats: 8 bits (υ-law or A-law) and 16 bits (linear). The PCM interface is a 4 pin, digital interface that enables PCM communication between the Module and an external codec or DSP. Both the PCM interface modes, auxiliary and primary, use the same SIM5215A pins. The PCM pin assignment is shown in the table below. Note: Please reference document [22] for detailed information of PCM Application Note. Table 27 : PCM pin assignment Pins   Pin No.  AUX_PCM functionality Primary_PCM functionality Description  PCM_CLK/GPIO3  31  AUX_PCM_CLK  PCM_CLK  PCM clock for PCM communication to external codec PCM_SYNC/GPIO2   30  AUX_PCM_SYNC PCM_SYNC  PCM data strobe for PCM communication to PCM mode SYNC CLK MODE  Format  Slot Auxiliary  8KHz  128KHz  Master  Only slot 0 Primary  8KHz  2.048MHz Slave/MasterA-law(8 bits)υ-law(8bits) linear(16 bits) 0~15(Changed by AT command:at+cpcmslot) Default:slot 0
 SIM5215A _HD_V1.02 Hardware Design                                     SIM5215A _HD_V1.02   26.08.2010   49external codec PCM_DIN/GPIO0  65  AUX_PCM_DIN  PCM_DIN  PCM data input to the Module (Rx) PCM_DOUT/GPIO5  33  AUX_PCM_DOUT PCM_DOUT  PCM data output from the Module (Tx) The default PCM interface on power up is the auxiliary PCM interface.   Under PCM, the data is output on the rising edge of PCM_CLK and sampled at the falling edge of PCM_CLK. Primary PCM is disabled at power up or when RESET is asserted, but you can use AT command to enable the primary PCM mode.   PCM Interface can be operated in Master and Slave mode.  When the PCM interface is configured, PCM Tx data will be routed from the external codec Mic through the DSP encode path in the Module.    PCM Rx data will be routed through the DSP decode path to the external codec speaker.   When using the PCM Interface, the Module can be set either into Master Mode or Slave Mode.   In Master Mode, the Module drives the clock and sync signals that are sent out to the external codec via the PCM Interface.    When in Slave Mode, the external codec drives the clock and sync signals that are sent to the Module.   Configuration Mode can be selected either primary or auxiliary.    Primary configuration mode uses 2.048MHz clock and 8 kHz short sync clock, and auxiliary configuration mode uses 128KHz clock and 8 kHz long sync clock.    One important consideration is that Slave mode is only available for use with Primary configuration Mode. PCM formats can also be chosen by AT command. In the default configuration, Module is the Auxiliary Master. Many parameters of external codec audio channel are not available.    Only RxVolume, FIR, are still available after enabling PCM. Table 30: PCM external codec Characteristics Audio Device no. AT+CSDVC=   4   Name   External Codec   micAmp No available txGain  No available txVol  No available Default MIC path Parameters txFilter [tap0~6]0xff33, 0x05d8,0xf488, 0x0af3, 0x24bb, 0xca42,0x7c95 rxGain  No available rxVol  -100 stGain  No available Default Output path Parameters  rxFilter [tap0~6]0xff00, 0xfac9,0x0571, 0xf365, 0x0bc2, 0xf2bb,0x533a
 SIM5215A _HD_V1.02 Hardware Design                                     SIM5215A _HD_V1.02   26.08.2010   50Default values of sound level (level 1 to 4) 0 0 0 0  NOTE: Please check the reference document [1] for detailed information of each AT command.  Both PCM modes are discussed in this section, followed by additional PCM topics. 3.18.1 Auxiliary PCM (128 kHz PCM clock) The auxiliary PCM interface enables communication with an external codec to support hands-free applications.    υ-law codec are supported by the auxiliary PCM interface. The auxiliary codec port operates with standard long-sync timing and a 128 kHz clock.    The AUX_PCM_SYNC runs at 8 kHz with 50% duty cycle.    Most υ-law codec support the 128 kHz clock.    Figure 28:AUX_PCM_SYNC timing   Figure 29:EXT_CODEC to SIM5215A timing
 SIM5215A _HD_V1.02 Hardware Design                                     SIM5215A _HD_V1.02   26.08.2010   51 Figure 30:SIM5215A to  EXT_CODEC timing Table 31 :    Auxiliary PCM mode timing parameters Parameter   Description   Min  Typical  Max  Unit   Note T(auxsync)  AUX_PCM_SYNC cycle time    –  125  -  μs   T(auxsynch)  AUX_PCM_SYNC high time    62.4 62.5  -  μs   T(auxsyncl)  AUX_PCM_SYNC low time    62.4 62.5  -  μs   T(auxclk)  AUX_PCM_CLK cycle time    -  7.8  –  μs  * T(auxclkh)  AUX_PCM_CLK high time  3.8 3.9  –  μs   T(auxclkl)  AUX_PCM_CLK low time    3.8 3.9  –  μs    T(suauxsync)   AUX_PCM_SYNC setup time high before falling edge of PCM_CLK   1.95  –  –   μs    T(hauxsync)  AUX_PCM SYNC hold time after falling edge of PCM_CLK 1.95 –   –   μs   T(suauxdin)  AUX_PCM_DIN setup time before falling edge of AUX_PCM_CLK 70  –   –   ns    T(hauxdin)   AUX_PCM_DIN hold time after falling edge of AUX_PCM_CLK 20  –   –   ns   T(pauxdout)  Delay from AUX_PCM_CLK rising to AUX_PCM_DOUT valid –  –   50  ns    *Note: t(auxclk) = 1/(128 kHz). 3.18.2 Primary PCM (2048 kHz PCM clock) The aux codec port also supports 2.048 MHz PCM data and sync timing for υ-law codec that matches the sync timing — this is called the primary PCM interface (or just PCM interface). You can use AT+CPCM command to change the mode you want.
 SIM5215A _HD_V1.02 Hardware Design                                     SIM5215A _HD_V1.02   26.08.2010   52Figure 31:PRIM_PCM_SYNC timing   Figure 32:EXT_CODEC to SIM5215A timing   Figure 33:SIM5215A to EXT_CODEC timing Table 32 : Primary PCM mode timing parameters Parameter   Description   Min  Typical  Max  Unit  Note T(sync)  PCM_SYNC cycle time  –  125  –  μs    T(synch)  PCM_SYNC high time  400 500  –  ns    T(syncl)  PCM_SYNC 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_SYNC setup time high before falling edge of PCM_CLK 60  –  –  ns     T(hsync)  PCM_SYNC hold time after falling edge of PCM_CLK 60  –  –  ns    T(sudin)   PCM_DIN setup time before falling edge of PCM_CLK 50  –  –  ns
 SIM5215A _HD_V1.02 Hardware Design                                     SIM5215A _HD_V1.02   26.08.2010   53T(hdin)   PCM_DIN hold time after falling edge of PCM_CLK 10  –  –  ns    T(pdout)  Delay from PCM_CLK rising to PCM_DOUT valid –  –  350  ns    T(zdout)   Delay from PCM_CLK falling to PCM_DOUT HIGH-Z –  160  –  ns     3.18.3 Transmitting PCM data by USB Not only by hardware PCM interface, but also SIM5215A can transmit PCM data by USB.   To transmit PCM data by USB, one should make sure that driver of SIM5215A has be loaded on host part. Then the NEMA port of SIM5215A can be recognized by host. One can switch it from NEMA port mode to data mode or from data mode to NEMA port mode by AT+DSWITCH. In data mode, one can control sending and receiving PCM data by AT+CPCMREG.   Note: For 5213/5214/5215/5216, NEMA port is used to transmit PCM data.Please reference document [22] for detailed information of PCM Application Note.  3.19 Firmware update If SIM5215A modules are embed into user’s equipment and can’t be taken out easily, modules provide two firmware update methods that called SD card update and USB interface update.   3.19.1 SD Card update SD card update means that user can use SD card which the new firmware has been put in the SIM5215A modules to update the old Firmware .
 SIM5215A _HD_V1.02 Hardware Design                                     SIM5215A _HD_V1.02   26.08.2010   54Figure 34:SD card update reference circuit  Figure 35:SD card update procedure Note1: Firmware contains:Amss.mbn, dbl.mbn, osbl.mbn, fsbl.mbn, partition.mbn, NPRG6270.hex, ENPRG6270.hex. Note2: Pulling down GPIO0 when SIMcom module is booting up, is to enable the SD Card Update function. Note3: The status LED(GPIO1) indicates that the update is going on when booting. Note4: This update function does not support QCN. So if the flash in the modules will be erased, please do backup QCN by QDL at first. Note5: This function is supported by the version 1575B04V01SIM5215A and later version. Note6: Modules in user equipment must connect a SD slot. Note7: Modules GPIO0 can be controlled by a GPIO on CPU/MCU, and must be pulled up after the status LED lighting . This connecting may conflict with PCM function because   GPIO0 is multiplexed as the PCM_DIN. 3.19.2 USB interface update. If SIM5215A communicate with MCU/CPU by hardware UART interface, user can route module USB to a USB-A/USB-B/mini-B slot, and connect USB slot to PC with USB cable .Figure 36 is the reference circuit.
 SIM5215A _HD_V1.02 Hardware Design                                     SIM5215A _HD_V1.02   26.08.2010   55 Figure 36:USB interface update reference circuit (UART communicate) MCU/CPU works with SIM5215A USB interface. User can select a USB 2.0 analog switch if one wants to use USB update. Figure 37 is the reference circuit. In USB update mode, modules are connected to PC on USB cable by CPU/MCU GPIO controlling. For USB 2.0 analog switch, User can use ON Semiconductor NLAS7222C.  Figure 37:USB interface update reference circuit (USB DPDT switch)
 SIM5215A _HD_V1.02 Hardware Design                                     SIM5215A _HD_V1.02   26.08.2010   56 Figure 38:USB interface update procedure Note1: USB 2.0 analog switch chip may add cost. Note2: If MCU/CPU works with SIM5215A USB interface we recommend to use SD Card update
 SIM5215A _HD_V1.02 Hardware Design                                     SIM5215A _HD_V1.02   26.08.2010   57 4 Antenna interface The RF interface has an impedance of 50Ω. To suit the physical design of individual applications SIM5215A offers two alternatives:  z Recommended approach: antenna connector on the component side of the PCB   z Antenna pad and grounding plane placed on the bottom side.    To minimize the loss on the RF cable, it needs to be very careful to choose RF cable.  We recommend that the insertion loss should meet the following requirements: z GSM900/GSM850   <1  dB z DCS1800/PCS1900   <1.5 dB z WCDMA 1900    <1.5 dB z WCDMA 850   <1 dB 4.1 Antenna installation 4.1.1 Antenna connector SIM5215A use MURATA MM9329-2700 RF connector on the module side, we recommend that user uses MURATA MXTK88XXXXX as matching connector on the application side.   Please refer to appendix for detailed information about MURATA MXTK88XXXXX.    Figure 39: Antenna Connector
 SIM5215A _HD_V1.02 Hardware Design                                     SIM5215A _HD_V1.02   26.08.2010   584.1.2 Antenna pad The antenna can be soldered to the pad, or attached via contact springs.    To help you to ground the antenna, SIM5215A comes with a grounding plane located close to the antenna pad.    Figure 40: Antenna pad  SIM5215A material properties: SIM5215A PCB Material: FR4 Antenna pad: Gold plated pad
 SIM5215A _HD_V1.02 Hardware Design                                     SIM5215A _HD_V1.02   26.08.2010   59 4.2 Module RF output power Table 33 : SIM5215A conducted RF output power Frequency      Max  Min GSM850    33dBm ±2db  5dBm±5db E-GSM900    33dBm ±2db  5dBm±5db DCS1800  30dBm ±2db  0dBm±5db P CS1900  30dBm ±2db  0dBm±5db GSM850(8-PSK)  27dBm ±3db  5dBm±5db E-GSM900(8-PSK)  27dBm ±3db  5dBm±5db DCS1800(8-PSK)  26dBm ±3db  0dBm±5db P CS1900(8-PSK)  26dBm ±3db  0dBm±5db WCDMA 1900  24dBm+1/-3db  <-50dBm WCDMA 850  24dBm+1/-3db  <-50dBm 4.3 Module RF receiver sensitivity Table 28: SIM5215A conducted RF receive sensitivity Frequency   Receive sensitivity GSM850    < -107dBm E-GSM900    < -107dBm DCS1800  < -107dBm P CS1900  < -107dBm WCDMA 1900  < -108dBm WCDMA 850  < -107dBm  4.4 Module operating frequencies Table 29: SIM5215A operating frequencies Frequency   Receive   Transmit  GSM850    869  ~ 894MHz  824  ~ 849MHz E-GSM900    925  ~ 960MHz  880  ~ 915MHz DCS1800  1805  ~ 1880MHz  1710  ~ 1785MHz P CS1900  1930  ~ 1990MHz  1850  ~ 1910MHz WCDMA 1900  1930  ~ 1990MHz  1850  ~ 1910MHz WCDMA 850  869  ~ 894MHz  824  ~ 849 MHz
 SIM5215A _HD_V1.02 Hardware Design                                     SIM5215A _HD_V1.02   26.08.2010   605 Electrical, reliability and radio characteristics 5.1 Absolute maximum ratings Absolute maximum rating for power supply and voltage on digital and analog pins of SIM5215A are list in following table:  Table 30: Absolute maximum ratings Parameter  Min  Max  Unit Peak current of power supply  0  3.0  A RMS current of power supply (during one TDMA- frame)  0  0.9  A Voltage at digit pins  -0.3  3.0  V Voltage at analog pins  -0.3  3.0  V Voltage at digit/analog pins in POWER DOWN mode  -0.25 0.25  V Voltage at VBAT  -0.3  4.4  V  5.2 Operating temperatures The operating temperature is listed in following table: Table 31: SIM5215A operating temperature Parameter  Min  Max  Unit  Note Operating temperature  -30  +80  ℃ The module is functional in allthe temperature range, and it fully meets the ETSI specifications. Storage temperature  -40  +85  ℃    5.3 Power supply ratings   Table 32: SIM5215A power supply ratings Parameter  Description  Conditions  Min  Typ  Max  UnitVBAT     Supply voltage  Voltage must stay within the min/max values, including voltage drop, ripple, and spikes.3.3 3.8  4.2  V
 SIM5215A _HD_V1.02 Hardware Design                                     SIM5215A _HD_V1.02   26.08.2010   61Voltage drop during transmit burst Normal condition, power control level for Pout max       300  mV Voltage ripple  Normal condition, power control level for Pout max @ f<400kHz @ f>400kHz            50    10   mV Average supply current POWER DOWN mode     35   uA  IVBAT   Peak supply current (during transmission slot every 4.7ms) Power control level for Pout max.   1.7  2  A 5.4 Current consumption The values for current consumption in Vbat 3.8V are listed in Table 39.  Here, “suspended” means that SIM5215A is connected with USB BUS but don’t transfer data. Table 339: SIM5215A current consumption   GSM IDLE mode (without USB suspend) GSM850  Sleep @DRX=2    3.0mA Sleep @DRX=5    1.8mA Sleep @DRX=9    1.4mA GSM900 Sleep @DRX=2    3.0mA Sleep @DRX=5    1.86mA Sleep @DRX=9    1.4mA DCS1800 Sleep @DRX=2    3.1mA Sleep @DRX=5    1.7mA Sleep @DRX=9    1.4mA PCS1900 Sleep @DRX=2    3.1mA Sleep @DRX=5    1.6mA Sleep @DRX=9    1.5mA GSM IDLE Mode(with USB suspend) GSM850  Sleep @DRX=2    4.3mA Sleep @DRX=5    2.8mA Sleep @DRX=9    2.2mA GSM900 Sleep @DRX=2    4.3mA Sleep @DRX=5    2.7mA Sleep @DRX=9    2.1mA DCS1800 Sleep @DRX=2    4.4mA Sleep @DRX=5    2.8mA Sleep @DRX=9    2.3mA
 SIM5215A _HD_V1.02 Hardware Design                                     SIM5215A _HD_V1.02   26.08.2010   62PCS1900 Sleep @DRX=2    4.4mA Sleep @DRX=5    2.7mA Sleep @DRX=9    2.2mA Voice Call GSM850  @power level #5 <300mA,Typical 270mA GSM 900  @power level #5 <310mA,Typical 270mA DCS1800  @power level #0 <220mA,Typical 210mA PCS1900  @power level #0 <200mA,Typical 190mA GPRS Data DATA mode, GPRS ( 1 Rx,4 Tx ) CLASS 12 GSM 850  @power level #5 <540mA GSM 900  @power level #5 <500mA DCS1800  @power level #0 <380mA PCS1900  @power level #0 <380mA DATA mode, GPRS ( 3Rx, 2 Tx ) CLASS 12 GSM 850  @power level #5 <390mA GSM 900  @power level #5 <380mA DCS1800  @power level #0 <300mA  PCS1900  @power level #0 <250mA  EDGE Data DATA mode, EDGE( 1 Rx,4 Tx ) CLASS 12 GSM 850  @power level #8 <350mA  GSM 900  @power level #8 <340mA DCS1800  @power level #2 <325mA  PCS1900  @power level #2 <290mA  DATA mode, EDGE( 3Rx, 2 Tx ) CLASS 12 GSM 850  @power level #8 <250mA GSM 900  @power level #8 <240mA DCS1800  @power level #2 <230mA PCS1900  @power level #2 <210mA UMTS IDLE Mode (without USB suspend) WCDMA 1900  Sleep @DRX=9    1.2mA Sleep @DRX=8    2.1mA Sleep @DRX=6   4.2mA WCDMA 850  Sleep @DRX=9    1.2mA Sleep @DRX=8    2.0mA Sleep @DRX=6   4.4mA UMTS IDLE Mode (with USB suspend) WCDMA 1900  Sleep @DRX=9    1.9mA Sleep @DRX=8    2.6mA Sleep @DRX=6   4.6mA WCDMA 850  Sleep @DRX=9    1.9mA Sleep @DRX=8    2.7mA Sleep @DRX=6   4.8mA UMTS Voice call WCDMA 1900  @Power 23dBm  Typical 580mA @Power 10dBm  Typical 205mA @Power-55dBm  Typical 174mA WCDMA 850  @Power 23dBm  Typical 510mA @Power 10dBm  Typical 195mA
 SIM5215A _HD_V1.02 Hardware Design                                     SIM5215A _HD_V1.02   26.08.2010   63@Power-55dBm  Typical 131mA HSDPA  Data(only 5216A) WCDMA 1900   @Power 23dBm  Typical 584mA @Power 10dBm  Typical 331mA @Power-55dBm  Typical 179mA WCDMA 850   @Power 23dBm  Typical 536mA @Power 10dBm  Typical 231mA @Power-55dBm  Typical 165mA 5.5 Electro-Static discharge   Normally SIM5215A is mounted on customer host board, although some ESD components have been added in SIM5215A, to improve ESD, one should put some ESD components on customer host board.    The ESD components should be placed beside the connectors which the human body might touch, such as SIM card holder, T-flash card holder, audio jacks, switches, keys, etc..      Below is the SIM5215A ESD performance measurement table, the results are got from our EVB board test. Table 40: The ESD performance measurement table (Temperature: 25 , Humidity:℃ 45% ) Part  Contact discharge  Air discharge VBAT,GND  ±4KV  ±10KV UART,USB  ±4KV  ±8KV Antenna port    ±4KV  ±10KV Other port  ±3KV  ±8KV  In order to get the best ESD performance, one must deal carefully with ground of SIM5215A on host board, which is most important.    Here are some advices: 1. Bare the copper on the host board. Figure 36 is SIM5215A PCB decal.  There is a big area which is poured with copper.  When one mounts the SIM5215A on host board, the bottom shield of SIM5215A can be connected to ground well through this copper area.    The SIM5215A PCB decal can be got from our FAE or sales people.  2. Choose 2.0mm height 70-pin socket for host board. Because the height of 70-pin plug on SIM5215A is 1.5mm, in order to better connecting the SIM5215A to the ground of the host board, it is suggested to choose 2.0mm height 70-pin socket for host board.    NAS AXK770247G is suitable.    2.5mm will be too high, it will be suspending above host board.    1.5mm will be too tight.    3. Fill some conductors between the bottom of SIM5215A and host board.   Figure 37 shows the conductor material we use. Other conductor material can be used as well.   4. Solder SIM5215A to ground through 2 out-feet of bottom shield.
 SIM5215A _HD_V1.02 Hardware Design                                     SIM5215A _HD_V1.02   26.08.2010   64There are 2 out-feet of SIM5215A bottom shield.    One can solder them to bare cooper on host board, so that SIM5215A can be connected to the ground well.     Figure 41: SIM5215A PCB decal  Figure 42: SIM5215A Soldering 2 out-feet of bottom shieding to host board
 SIM5215A _HD_V1.02 Hardware Design                                     SIM5215A _HD_V1.02   26.08.2010   656 Mechanics This chapter describes the mechanical dimensions of SIM5215A. 6.1 Mechanical dimensions of SIM5215A Following are SIM5215A top view, side view and bottom view.   These show you Mechanical dimensions of SIM5215A.     Figure 43: Mechanical dimensions of SIM5215A(Unit: mm)            6.2 Mounting SIM5215A onto the application platform Use the connector AXK870145WG and four mounting pads to fix the SIM5215A onto the customer platform.
 SIM5215A _HD_V1.02 Hardware Design                                     SIM5215A _HD_V1.02   26.08.2010   66 Figure 44: PIN sequence of SIM5215A     When one mounts SIM5215A on host board, please pay attention to that the pin sequence of SIM5215A is mirror image of pin sequence of 70-pin socket connector on host.
 SIM5215A _HD_V1.02 Hardware Design                                     SIM5215A _HD_V1.02   26.08.2010   67 Figure 45: Mirror image of pin sequence   6.3 Board-to-board connector We recommend users to adopt NAIS AXK770247G as the board to board connector in their own PCB to connect with SIM5215A.    These high density SMT connectors are designed for parallel PCB-to-PCB applications.    They are ideal for using in VCRs, notebook PCs, cordless telephones, mobile phones, audio/visual and other telecommunications equipment where reduced size and weight are important.    The height of AXK770247G is 2.0mm. Following are parameters of AXK770247G for more details, you can login http://www.NAIS-E.com for more information.   Mechanical dimensions of the NAIS 70pin connector
 SIM5215A _HD_V1.02 Hardware Design                                     SIM5215A _HD_V1.02   26.08.2010   68 Figure 46: NAIS AXK770247G board-to-board connector pin side                 Figure 47: NAIS AXK870145WG board-to-board connector pin side NOTE:The connector NAIS AXK870145WG is used in SIM5215A side and NAIS AXK770247G is used in pin side (host board side). 6.4 RF connector and adapter cable The RF connector in module side is Murata Company RF Connectors MM9329-2700, it makes a pair with Murata Company RF cable MXTK88TK2000.  It has high performance with wide frequency range, surface mountable and reflow solderable. Following are parameters.
 SIM5215A _HD_V1.02 Hardware Design                                     SIM5215A _HD_V1.02   26.08.2010   69 Figure 48: RF connector MM9329-2700   Figure 49: RF adapter cable MXTK88TK2000 For more information about the connector, please visit http://www.murata.com/
 SIM5215A _HD_V1.02 Hardware Design                                     SIM5215A _HD_V1.02   26.08.2010   706.5 View of the SIM5215A                       Bottom View                     Top View Figure 50: Top and Bottom View of SIM5215A  6.6 PIN assignment of board-to-board connector of SIM5215A     Table 34 : Connection diagrams Pin No  Define  Measure without usage  Pin No  Define  Measure without usage 1  VBAT  VBAT  70  VBAT  VBAT 2  VBAT  VBAT  69  VBAT  VBAT 3  VBAT  VBAT  68  VBAT  VBAT 4  GND  GND  67  GND  GND 5  GND  GND  66  GND  GND 6  UART_TXD  NC  65  GPIO0  NC 7  UART_CTS  NC  64  UART_RXD  NC(See Note) 8  UART_DCD   NC  63  UART_RTS  NC 9  USB_VBUS  NC  62  UART_DTR   NC 10  GPIO1  NC  61  UART_RI   NC 11  VRTC  NC  60  USB_D_P  NC 12  USIM_CLK  NC  59  USB_D_M  NC 13  USIM_RESET  NC  58  GND  GND 14  Reserved  NC  57  V_USIM  NC 15  CAM_D2  NC  56  USIM_DATA  NC(See Note) 16  CAM_D4  NC  55  Reserved  NC 17  CAM_D6  NC  54  CAM_D3  NC
 SIM5215A _HD_V1.02 Hardware Design                                     SIM5215A _HD_V1.02   26.08.2010   7118  CAM_D8  NC  53  CAM_D5  NC 19  CAM_HSYNC  NC  52  CAM_D7  NC 20  GND   GND  51  CAM_D9  NC 21  CAM_CLK  NC  50  CAM_VSYNC  NC 22  CAM_STANDBY  NC  49  CAM_PCLK  NC 23  SPK_P  NC  48  CAM_RESET  NC 24  SPK_N  NC  47  IIC_SDA  NC(See Note) 25  EAR_P  NC  46  IIC_SCL  NC(See Note) 26  EAR_N  NC  45  POWER_ON  NC 27  HPR  NC  44  MIC_N  0.1u cap to ground 28  HPL  NC  43  MIC_P  0.1u cap to ground 29  RESET  NC  42  HP_MICP  NC 30  GPIO2  NC  41  HKADC   NC 31  GPIO3  NC  40  VREG_AUX  NC 32  GPIO4  NC  39  SD_DATA3  NC 33  GPIO5  NC  38  SD_DATA2  NC 34  SD_CLK  NC  37  SD_DATA1  NC 35  SD_CMD  NC  36  SD_DATA0  NC  Note: UART_RXD has been pulled down with a 15kR resistor to ground in module. USIM DATA has been pulled up with a 22kR resistor to V_USIM in module. IIC_SDA and IIC_SCL have been pulled up with two 2.2kR resistors to 2.6V in module. So there is no need to pull them up or down in your application circuit.     Contact us: Shanghai SIMCOM Wireless Solutions Ltd. Add: SIM Technology Building,No.633,Jinzhong Road,Changning District,Shanghai P.R. China 200335 Tel: +86 21 3235 3300 Fax: +86 21 3235 3301 URL: www.sim.com/wm

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