THE GSM EMBEDDED MODEM USER'S GUIDE
Contents
1. InterCEL Pty Ltd A C N 007 077 161 33 Glenvale Crescent Mulgrave VIC Australia 3170 Email intercel intercel com au Go anywhere Communication Internet www intercel com au and Data Transfer Ph 61 3 9561 1666 Fax 61 3 9561 2614 History Version 1 3 Created 10 Oct 2001 Author Sang Vu Date 28 Mar 2002 Version 1 1 Modifying the 44 pin connector pinouts Date 11 Jun 2002 Version 1 2 Modifying the power supply voltage Date 25 Jun 2002 Version 1 3 Add details to all signals remove the development board Confidential Page 1 25 06 2002 INTER 55 Go anywhere Communication and Data Transfer InterCEL Pty Ltd A C N 007 077 161 33 Glenvale Crescent Mulgrave VIC Australia 3170 Email intercel intercel com au Internet www intercel com au Ph 61 3 9561 1666 Fax 61 3 9561 2614 Contents 1 Introduction 1 1 Scope of this manual 1 2 Electrical characteristics 1 3 Mechanical characteristics 1 4 Features 1 4 1 Telephony 1 4 2 Short Message Service 1 4 3 Data 1 4 4 GPRS packet data features 1 4 5 GSM Supplementary Service 1 4 6 Others 1 5 Interfaces 2 RF Safety 2 1 General 2 2 Exposure to RF energy 2 3 Efficient modem operation 2 4 RF interference 3 Standard Compliance 3 1 GSM Phase II compliance 3 2 Safety compliance 3 3 EMC compliance 3 4 FTA compliance 3 4 1 IMEI number 3 4 2 CE label 3 5 ACA compliance 4 RF specifications 4 1 RF architecture 4 2 RF frequency2. 4 3 RF performance 4 3 1 Receiver 4 3 2 Transmitter 5 Hardware Description 5 1 Overview 5 2 The 44 pin connector 5 3 Signal descriptions 5 3 1 Power supply 5 3 2 SPI bus 5 3 3 Keypad interface 5 3 4 Serial link 5 3 5 SIM interface 5 3 6 General Purpose Input Output 5 3 7 Audio 5 3 8 Buzzer output 5 3 9 Control signals 5 3 10 Real time clock supply Confidential Page 2 25 06 2002 INTER 4 55 Go anywhere Communication and Data Transfer 1 Introduction InterCEL Pty Ltd A C N 007 077 161 33 Glenvale Crescent Mulgrave VIC Australia 3170 Email intercel intercel com au Internet www intercel com au Ph 61 3 9561 1666 Fax 61 3 9561 2614 The GEM is designed to provide a quick and easy solution to systems that need to access GSM GPRS network functionality The modem is full type approved and ready to use It employs the proven GSM WISMO technology from WAVECOM 1 1 Scope of this manual This document describes the hardware interface and the technical specification of the GEM For information about controlling the modem via the AT commands refer to the AT command manual 1 2 Electrical characteristics Class 4 2W for GSM 900 Class 1 1W for GSM 1800 1900 Voice SMS Fax and data 3V SIM interface Power supply 3 6V to 4 2V 2A 300mA average current consumption 9mA in idle mode Operating temperature 20 C to 55 C Storage temperature 35 C to 85 C 1 3 Mechanical charac
3. DTR RXD DSR TXD CTS DCD RI BOOT GPIO4 VCC_RTC GPIOS GPIOO LED SIM_PRES SIM DATA SIM_CLK SIM_RESET SIM_VCC SPI CLK SPI_EN SPI_IO Key Row0 Key _Column0 Key_Rowl Key Column Key Row2 Key _Column2 Key Row3 Key _Column3 Key_Row4 Key _Column4 3V6 3V6 Description Pinl Pin2 Ground high current Input modem on off control signal Ground high current Input modem reset control signal Analogue input signal Buzzer output Microphone positive input Speaker2 positive output Microphone negative input Speaker2 negative output RS232 interface input RS232 interface input RS232 interface output RS232 interface output RS232 interface input RS232 interface output RS232 interface output RS232 interface output Input control signal General Purpose input Output 4 Supply voltage to Real Time clock General Purpose input Output 5 General Purpose input Output 0 Output Working Indication Input SIM card detect T O SIM data Output SIM clock Output SIM reset Output SIM card supply voltage Output SPI clock Output SPI enable T O SPI data T O Keypad Row 0 T O keypad Column 0 T O Keypad Row 1 T O keypad Column 1 T O Keypad Row 2 T O keypad Column 2 T O Keypad Row 3 T O keypad Column 3 T O Keypad Row 4 T O keypad Column 4 Supply voltage Supply voltage Page 9 25 06 2002 InterCEL Pty Ltd A C N 007 077 161 33 Glenvale Crescent Mulgrave VIC Australia 3170 Email intercel interce
4. com au and Data Transfer Ph 61 3 9561 1666 Fax 61 3 9561 2614 6 Antenna specifications e Frequency band Dual band E GSM 900Mhz GSM 1800MHz GSM 1900Mhz EGSM 900 GSM 1800 GSM 1900 Rx band 925 960MHz 1805 1880Mhz 1930 1990MHz Tx band 880 915Mhz 1710 1785Mhz 1850 1910MHz e Impedance 50 e VSWR Tx max 2 1 Rx max 2 1 e Typical radiated gain 0dBi Confidential Page 15 25 06 2002
5. 5 RMS Frequency error 0 1 ppm max Confidential Page 7 25 06 2002 InterCEL Pty Ltd A C N 007 077 161 33 Glenvale Crescent Mulgrave VIC Australia 3170 Email intercel intercel com au INTER Go anywhere Communication Internet www intercel com au and Data Transfer Ph 61 3 9561 1666 Fax 61 3 9561 2614 5 Hardware Description 5 1 Overview The GEM includes a Wavecom Wismo3 module a 44 pin header a SIM card holder and a RF connector Pinl Pin2 Pin43 Pin44 Figure 1 Modem bottom view B A Figure 2 Modem Top view J Of ea connector Figure 3 Modem side view Modem connector Samtec 44 pin high density Antenna connector MMCX Confidential Page 8 25 06 2002 INTER 55 Go anywhere Communication and Data Transfer 5 2 The 44 pin connector InterCEL Pty Ltd A C N 007 077 161 33 Glenvale Crescent Mulgrave VIC Australia 3170 Email intercel intercel com au Internet www intercel com au Ph 61 3 9561 1666 Fax 61 3 9561 2614 This connector consists of all signals necessary for system integration It consists of serial RS232 signals audio input output general I O keypad power supply and modem control signals Pin number OANDUNPWNeE BBR HRB BD W WW WW WWW WWNNNNNNNNWNWD BR BB BBR ee BWNRF TDOAAIDABPWNK TDUOUANIADMNHPWNF TOWN DUNHRWNK CO Confidential T O type GND ON OFF GND RESET AUXV0 BUZZER MIC2 SPEAKER2 MIC2 SPEAKER2 RTS
6. C tick mark which enables it to be used in Australia and New Zealand Confidential Page 6 25 06 2002 InterCEL Pty Ltd A C N 007 077 161 33 Glenvale Crescent Mulgrave VIC Australia 3170 Email intercel intercel com au Go anywhere Communication Internet www intercel com au and Data Transfer Ph 61 3 9561 1666 Fax 61 3 9561 2614 4 RF specifications 4 1 RF architecture The RF part is based on a specific dual band chip and includes 2 dedicated down converters IF demodulator All local RF amp IF VCO PLL Transmit loop modulator down mixer phase frequency comparator 2 power amplifiers 4 2 RF frequencies The RF functionalities comply with the Phase II EGSM 900 GSM 1800 or GSM 1900 recommendation Rx EGSM 925 to 960MHz Tx EGSM 880 to 915MHz Rx GSM 1800 1805 to 1880MHz Tx GSM 1800 1710 to 1785MHz Rx GSM 1900 1930 to 1990MHz Tx GSM 1900 1850 to 1910MHz 4 3 RF performances 4 3 1 Receiver EGSM 900 sensitivity lt 102 dBm GSM 1800 1900 sensitivity lt 102 dBm Selectivity 200 KHz gt 9 dBc Selectivity 400 KHz gt 41 dBc Dynamic range gt 43 dBm Co channel rejection gt 9 dBc 4 3 2 Transmitter Maximum output power for EGSM 900 33dBm 2dB Maximum output power for GSM 1800 1900 30dBm 2dB Minimum output power for EGSM 900 5dBm 5dB Minimum output power for GSM 1800 1900 0dBm 2dB H2 level lt 30 dBm H3 level lt 30 dBm Phase error at peak power lt
7. RF energy However RF energy may affect some equipment that is inadequately shielded To use the modem near particular electronic equipment check with the manufacturer s shielding specifications Confidential Page 5 25 06 2002 InterCEL Pty Ltd A C N 007 077 161 33 Glenvale Crescent Mulgrave VIC Australia 3170 Email intercel intercel com au Go anywhere Communication Internet www intercel com au and Data Transfer Ph 61 3 9561 1666 Fax 61 3 9561 2614 3 Standard Compliance The GEM modem meets the following standards 3 1 GSM Phase II compliance e EN 301 419 1 GSM 13 01 April 2000 Version 4 1 1 e EN 301 420 GSM 13 02 December 1999 Version 4 0 1 e ETS 300 607 1 GSM 11 10 1 September 2000 Version 4 28 1 e GT 01 December 2000 Version 4 7 0 3 2 Safety e EN 60950 2000 es edition Safety of information technology equipment 3 3 EMC e EN 301 489 7 2000 e EN 301 489 1 2000 e EN 50081 1 1992 e EN50082 1 1997 3 4 FTA compliance The GEM has received a Full Type approval according to normal MS requirements in the configuration using the internal SIM interface 3 4 1 IMEI number e TAC 500246 e FAC 66 e Serial number 000000 to 999999 3 4 2 CE label The GEM is CE compliant which implies that the modem is in conformity with the European Community directives and bears the CE label CE0681 3 5 ACA compliance The modem has been declared to be ACA compliant It bears the A tick mark and
8. UCS2 character set management 1 5 Interfaces Single Antenna Interface 3V only internal SIM interface 44 pin general purpose connector Serial RS 232C link 300bps to 115200 bps Confidential Page 4 25 06 2002 InterCEL Pty Ltd A C N 007 077 161 33 Glenvale Crescent Mulgrave VIC Australia 3170 Email intercel intercel com au Go anywhere Communication Internet www intercel com au and Data Transfer Ph 61 3 9561 1666 Fax 61 3 9561 2614 2 RF safety 2 1 General The GEM is based on the GSM standard for cellular technology It is a low power radio transmitter and receiver It sends and receives radio frequency energy The GEM radio frequency and transmit power levels are controlled by the cellular system 2 2 Exposure to RF energy There has been some public concern about possible health effects of using GSM modem After all existing researches have been reviewed and all applicable safety standards have been met the modem is fitted for use If exposure to RF energy is still the main concern there are ways to minimize the exposure Positioning the antenna and limitting the duration of the calls 2 3 Efficient modem operation For the modem to operate at the lowest power level use the correct antenna and place the antenna at the position where it gets the best possible signal strength Do not hold the antenna while the modem is in a call 2 4 RF interference Most of the electronic equipments are shielded against
9. ail intercel intercel com au Go anywhere Communication Internet www intercel com au and Data Transfer Ph 61 3 9561 1666 Fax 61 3 9561 2614 5 3 8 Buzzer output The Buzzer output is a digital one A buzzer can be directly connected between this output and supply voltage 3V6 The maximum peak current is 80mA and the maximum average current is 40mA A diode against transient peak voltage is recommended Pin 6 Buzzer output Vbatt Buzzer Capacitor 0 to 100nF depending on the buzzer type Recommended characteristics for the buzzer Type Electro magnetic Impedance 70 to 32Q Sensitivity 90dB SPL minimum 10cm Current 60mA to 90mA 5 3 9 Control signals 5 3 9 1 ON OFF Pin 2 ON OFF This input is used to switch the modem on or off A high level signal 3 V6 has to be applied to this input for at least 1 second to turn the modem on The high signal can be left until modem is switched off To properly switch the modem off the On Off signal must be pulled to low and AT CPOF command must be sent to the modem to deregister Power on sequence ls minimum Power Supply ON OFF Internal Reset Modem state OFF RESET ON READY Power off sequence Power Supply Network dependent ON OFF AT command AT CPOF OK response Modem state READY OFF Confidential Page 13 25 06 2002 InterCEL Pty Ltd A C N 007 077 161 33 Glenvale Crescent Mulgrave VIC Australia 3170 Email intercel i
10. input can be adjusted internally from 30dB to 51dB using the AT VGT command AT VGT Max Vin mVrms Transmit gain dB 0 to 31 43 80 30 32 to 63 31 01 33 64 to 95 21 95 36 96 to 127 15 54 39 128 to 159 11 00 42 160 to 191 7 79 45 192 to 223 5 51 48 224 to 255 3 90 51 Recommended characteristics for the microphone Type Electret Impedance 2KQ to 3KQ Sensitivity 40dB to S0dB SNR gt 50dB minimum 5 3 7 2 Speaker The Speaker2 outputs are push pull amplifiers and can be loaded down to 150 and up to InF These outputs are differential and the output power can be adjusted by 2dB steps Pin 8 Speaker2 Pin 10 Speaker2 The Speaker gain can be adjust internally using the AT VGR command AT VGR Max Output Level Max speaker load Oto 15 1 74 Vrms 150Q 16 to 31 1 38 Vrms 50Q 32 to 47 1 099 Vrms 32Q 48 to 63 0 873 Vrms 32Q 64 to 79 0 693 Vrms 32Q 80 to 95 0 551 Vrms 32Q 96 to 111 0 437 Vrms 32Q 112 to 127 0 347 Vrms 32Q 128 to 143 0 276 Vrms 32Q 144 to 159 0 219 Vrms 32Q 160 to 175 0 174 Vrms 32Q 176 to 191 0 138 Vrms 32Q 192 to 207 0 110 Vrms 32Q 208 to 223 0 087 Vrms 32Q 224 to 239 0 069 Vrms 32Q 240 to 155 0 069 Vrms 32Q Recommended characteristics for the speaker Type 10mW electro magnetic Impedance 32Q to 150Q InF Sensitivity 110dB SPL minimum 0dB 20pPa Confidential Page 12 25 06 2002 InterCEL Pty Ltd A C N 007 077 161 33 Glenvale Crescent Mulgrave VIC Australia 3170 Em
11. l com au Go anywhere Communication Internet www intercel com au and Data Transfer Ph 61 3 9561 1666 Fax 61 3 9561 2614 5 3 Signal description 5 3 1 Power supply Pin1 Pin3 Supply Ground Pin43 Pin44 Supply input voltage Power supply design is an important factor In communication mode the GSM modem transmits in burst sequences 577 1s burst every 4 615ms therefore the power supply must be able to deliver high current peaks in short period of time During these peaks the ripple voltage Vripp must be less than 50mVpp for ripple frequency lt 200KHz or 2mVpp for ripple frequeny gt 200KHz and the Drop Voltage Vdrop must be less than 100mVpp Vsupply gt Vripp t 577ps i T 4 615ms Supply voltage 3 6V Minimum 3V8 nominal 4 2V absolute maximum Supply current 2 amperes Current consumption in OFF mode Nominal 50nA Maximum 100A Current consumption in communication mode assuming a 50Q RF load During Tx burst Norminal 1 7A peak Maximum 2A peak During Rx burst Norminal 75mA peak Maximum 80mA peak Average in communication Norminal 300mA Maximum 400mA Average in idle Norminal 3mA Maximum 6 5mA 5 3 2 SPI bus Pin 30 SPI CLK Pin 31 SPL EN Pin 32 SPI_IO The SPI bus complies with the SPI bus standard The maximum speed is 3 25Mb s NOTE The SPI bus is not yet implemented for AT command type of application 5 3 3 Keypad interface Pin 33 Key row0 Pin 34 Key c
12. ntercel com au Goa nyw here Communication Internet www intercel com au and Data Transfer Ph 61 3 9561 1666 Fax 61 3 9561 2614 5 3 9 2 BOOT Pin 19 BOOT input This input is used to download the firmware into the modem s Flash memory The internal boot procedure starts when this input is low during the modem reset This input should be left open when not used If used it must be driven by an open collector drain This is a back up download procedure The main download procedure is to use AT WDWL command Refer to download procedure using AT command manual uP to drive BOOT signal Manual activated BOOT pin Ll BOOT pin uP pin 5 3 9 3 RESET Pin 4 RESET input This input is used to force a cold reset by providing a low level for at least 100uS This Reset signal has to be considered as an emergency reset only since a reset procedure is automatically done on power up Ifused the Reset signal has to be driven by an open collector or open drain 5 3 10 Real time clock supply Pin 21 VCC_RTC This pin is used as a back up power supply for the internal real time clock when the modem is switched off It can be left open if not used Requirements Input voltage 2V minimum 2 75V maximum Input current 104A nominal Confidential Page 14 25 06 2002 InterCEL Pty Ltd A C N 007 077 161 33 Glenvale Crescent Mulgrave VIC Australia 3170 Email intercel intercel com au Goa nyw here Communication Internet www intercel
13. olumn0 Pin 35 Key rowl Pin 36 Key column Pin 37 Key row2 Pin 38 Key column2 Pin 39 Key row3 Pin 40 Key column3 Pin 41 Key row4 Pin 42 Key column4 The modem provides scanning debouncing functions The key is reported using AT CMER command Confidential Page 10 25 06 2002 InterCEL Pty Ltd A C N 007 077 161 33 Glenvale Crescent Mulgrave VIC Australia 3170 Email intercel intercel com au Go anywhere Communication Internet www intercel com au and Data Transfer Ph 61 3 9561 1666 Fax 61 3 9561 2614 5 3 4 Serial link The 8 wire serial link complies with the V 24 protocol but not with the V 28 electrical interface due to 3V logic Pin number T O Description Pin 11 RTS In Ready to Send Pin 12 DTR In Data Terminal Ready Pin 13 RXD Out Receive Data Pin 14 DSR Out Data Set Ready Pin 15 TXD In Transmit Data Pin 16 CTS Out Clear To Send Pin 17 DCD Out Data Carrier Detect Pin 18 RI Out Ring Indicator 5 3 5 SIM interface The modem has already implemented a 3V SIM card on board These SIM signals are given to enable an external 3V SIM card if required A 5V SIM can also be implemented using an external SIM driver Note that if an external SIM card is implemented only one SIM card can be inserted at any one time Pin Number vo Description Pin 25 SIM_PRES In SIM card detect Pin 26 SIM_DATA In Out Bidirectional SIM data Pin 27 SIM_CLK Out SIM clock Pin 28 SIM_RESET Out SIM rese
14. t Pin29 SIM_VCC Out SIM power supply For SIM_PRES signal when not used tie to Vcc When used a low to high transition means that the SIM card is inserted A high to low transition means that the SIM card is removed 5 3 6 General purpose input output The modem provides 3 digital input output signals and 1 analogue input signal The digital I O signals associated with the AT WIOR AT WIOW command The 10bit analogue input OV to 2 8V associated with AT ADC command sampling rate is 90 3Ksps Pin 5 AUXVO Pin 20 GPIO4 Pin 22 GPIOS Pin 23 GPIOO Pin 24 LED The LED output can be used to drive a LED indicator via a transistor The rate of flashing indicates different states that the modem is in LED on steady Modem is on but has not register to the network Slow flash Modem has registered to the network Rapid flash Modem is in communication mode 5 3 7 Audio 5 3 7 1 Microphone The Microphone 2 inputs are differential They include the biasing for an electret microphone 0 5mA and 2V The electret microphone s impedance has to be around 2KQ and can be connected directly Pin 7 Microphone2 Pin 9 Microphone2 Confidential Page 11 25 06 2002 InterCEL Pty Ltd A C N 007 077 161 33 Glenvale Crescent Mulgrave VIC Australia 3170 Email intercel intercel com au Goa nyw here Communication Internet www intercel com au and Data Transfer Ph 61 3 9561 1666 Fax 61 3 9561 2614 The gain of the Microphone
15. teristics Weight 25g Casing ABS Plastic Mounting 3 screw holes 1 4 Features 1 4 1 Telephony e Telephony TCH FS and Emergency calls e Full Rate Enhanced Full Rate and Half Rate e DTMF functions 1 4 2 Short Message Service e Point to Point MT and MO SMS Cell Broadcast 1 4 3 Data e e Automatic fax group 3 Class 1 and Class2 e Alternate speech and fax e MNP2 V 42bis Confidential Small size 62mm L x 38mm W x 12mm H Page 3 Dual band GSM modem E GSM 900 1800 or E GSM 900 1900 Tricodec Full Rate Enhanced Full Rate and Half Rate Data circuit asynchronous transparent and non transparent up to 14 4kbps 25 06 2002 InterCEL Pty Ltd A C N 007 077 161 33 Glenvale Crescent Mulgrave VIC Australia 3170 Email intercel intercel com au Goan here Communication Internet www intercel com au and Data Transfer Ph 61 3 9561 1666 Fax 61 3 9561 2614 1 4 4 GPRS packet data features e GPRS class 2 Class B 2Rx 1Tx GSM GPRS switchable e Coding schemes CS1 to CS4 e Compliant with SMG31bis 1 4 5 GSM Supplementary Service Call Forwarding Call Barring Multi Party Call Waiting and Call Hold Calling Line Identity Advice of Charge USSD Closed User Group Explicit Call Transfer 1 4 6 Others ME SIM phone book management Fixed Dialling Number SIM Toolkit Class 2 SIM network and service provider locks Real Time Clock Alarm management Software upgrade through Xmodem protocol
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