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SimCom SIM900D EVB, Hardware Design

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SIM900D Hardware Design                                                                     

 

 MODULE(DCE)

         DBG_TXD

         DBG_RXD

             GND

          PWRKEY

TXD

RXD

GND

PWRKEY

Serial port

I/O Connector

 

Figure19: Connection of software upgrade and software debug 

The serial port and the debug port do not support the RS_232 level and it only supports the CMOS level. Please 
refer to the table 12 for details about the voltage level. User should add the level converter IC between the DCE 
and DTE, if user uses it with the computer. Please refer to the following figure. 

MODULE

DCD

TXD

CTS

RI

RXD

DTR

RTS

 

Figure20: RS232 level converter circuit 

SIM900D_Hardware Design_V1.04 

                                                                                                           

         2010.10.09

 

 

39

Summary of Contents for SIM900D EVB

Page 1: ...a SIM900D_Hardware Design_V1 04...

Page 2: ...lidation 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 subj...

Page 3: ...f SIM900D 26 3 4 3 Restart SIM900D Using the PWRKEY Pin 28 3 5 Charging interface 28 3 5 1 Battery pack characteristics 29 3 5 2 Recommended battery pack 29 3 5 3 Implemented charging technique 30 3 5...

Page 4: ...50 3 16 General Purpose Input Output GPIO 51 3 17 PWM 51 4 Antenna Interface 53 4 1 Module RF Output Power 53 4 2 Module RF Receive Sensitivity 53 4 3 Module Operating Frequencies 53 5 Electrical Rel...

Page 5: ...TABLE15 AUDIO OUTPUT CHARACTERISTICS 43 TABLE16 PIN DEFINITION OF THE SIM INTERFACE 44 TABLE17 PIN DESCRIPTION AMPHENOL SIM CARD HOLDER 46 TABLE18 PIN DESCRIPTION MOLEX SIM CARD HOLDER 47 TABLE19 PIN...

Page 6: ...F SOFTWARE UPGRADE AND SOFTWARE DEBUG 39 FIGURE20 RS232 LEVEL CONVERTER CIRCUIT 39 FIGURE21 SPEAKER INTERFACE CONFIGURATION 41 FIGURE22 SPEAKER INTERFACE WITH AMPLIFIER CONFIGURATION 41 FIGURE23 MICRO...

Page 7: ...eceive sensitivity Jing zhou 3 8 Modify the VRTC pin connection when backup is not needed 2 1 3 3 3 4 Modify the power supply range from 3 4V 4 5V to 3 1V 4 8V 2010 06 24 1 03 3 4 1 1Update the Figure...

Page 8: ...ns 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 Ci...

Page 9: ...al Ready DTX Discontinuous Transmission EFR Enhanced Full Rate EGSM Enhanced GSM EMC Electromagnetic Compatibility ESD Electrostatic Discharge ETS European Telecommunication Standard FCC Federal Commu...

Page 10: ...RT Universal Asynchronous Receiver Transmitter URC Unsolicited Result Code USSD Unstructured Supplementary Service Data UVLO Under Voltage Lock Out VSWR Voltage Standing Wave Ratio Vmax Maximum Voltag...

Page 11: ...the usage of mobiles in a hospital or other health care facility Switch the cellular terminal or mobile off since medical equipment may be sensitive not to operate normally for RF energy interference...

Page 12: ...itions for example no mobile fee available or with an invalid SIM card While users are in this kind of condition and need emergent help please remember using emergency calls In order to make or receiv...

Page 13: ...ly built into handset headset and handfree channel z The SPI display interface and two Programmable General Purpose Input Output will give users the flexibility to develop customized applications SIM9...

Page 14: ...MS storage SIM card FAX Group 3 Class 1 SIM interface Support SIM card 1 8V 3V External antenna Antenna pad Audio features Speech codec modes z Half Rate ETS 06 20 z Full Rate ETS 06 10 z Enhanced Ful...

Page 15: ...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 2 2 SI...

Page 16: ...IO Serial Port Digital interface Debug upgrading program SIM interface LCD interface PWRKEY RTC Analog interface Audio interface ADC Charger Figure1 SIM900D functional diagram 2 3 SIM900D Evaluation B...

Page 17: ...SIM900D Hardware Design SIM900D_Hardware Design_V1 04 2010 10 09 17 Figure2 Top view of SIM900D EVB For details please refer to the SIM900D EVB_UGD document...

Page 18: ...PTION DC CHARACTERISTICS COMMENT VBAT I 2 VBAT pins are dedicated to connect the supply voltage The power supply of SIM900D has to be a single voltage source of VBAT 3 2V 4 8V It must be able to provi...

Page 19: ...ative voice band input If unused keep open SPK1P SPK1N O Positive and negative voice band output If unused keep open SPK2P SPK2N O Auxiliary positive and negative voice band output If unused keep open...

Page 20: ...O DBG_RXD I Serial interface for debugging and firmware upgrade VILmax 0 4V VIHmin 2 4V VILmin 0V VIHmax 3V VOHmin 2 7V VOLmax 0 1V VOHmax 3V VOLmin 0V If unused keep open SIM interface PIN NAME I O...

Page 21: ...to send and receive GSM TALK Connection between two subscribers is in progress In this case the power consumption depends on network settings such as DTX off on FR EFR HR hopping sequences antenna GPR...

Page 22: ...rent consumption rises to typical peaks of 2A So the power supply must be able to provide sufficient current up to 2A For the VBAT input a local bypass capacitor about 100 F low ESR is recommended Mul...

Page 23: ...transmit burst 3 3 1 Power Supply Pins Two VBAT pins are dedicated to connect the supply voltage and nine GND pins are dedicated to connect ground VRTC pin can be used to back up the RTC 3 3 2 Minimiz...

Page 24: ...can be turned on by two ways which are described in the following chapters z Via PWRKEY pin starts normal operating mode please refer to chapter 3 4 1 1 z Via VCHG Pin starts Charge only mode please r...

Page 25: ...n scenarios illustrates as following figure STATUS OUTPUT VIL 0 15 VDD_EXT VIH 0 85 VDD_EXT Pulldown 1s VBAT PWRKEY INPUT VOH 0 85 VDD_EXT Serial Port Undefined Active Delay 3 2s Figure9 Timing of tur...

Page 26: ...4 2 Turn Off SIM900D Following ways can be used to turn off the SIM900D z Normal power down procedure Turn off SIM900D using the PWRKEY pin z Normal power down procedure Turn off SIM900D using AT comm...

Page 27: ...command of AT CPOWD 3 4 2 3 Over voltage or Under voltage Automatic Shutdown The module will constantly monitor the voltage applied on the VBAT If the voltage 3 3V the following URC will be presented...

Page 28: ...re you can used the AT CMTE command to read the temperature when the module is power on For details please refer to related document 1 3 4 3 Restart SIM900D Using the PWRKEY Pin User can restart SIM90...

Page 29: ...should have a protection circuit to avoid overcharging deep discharging and over current and the circuit should be insensitive to pulsed current z The internal resistance of the battery pack including...

Page 30: ...ot your concern So it is very simple to implement charging technique user just needs to connect the charger to the VCHG Pin and connect the battery to the VBAT Pin SIM900D battery charging happens aft...

Page 31: ...n Charge mode and Charge only mode Table8 Charge operating modes How to activate mode Features Charge Mode Connect charger to module s VCHG Pin and connect battery to VBAT Pin of module while SIM900D...

Page 32: ...default value is 0 3 5 5 Charger requirements Following is the requirements of charger for SIM900D Simple transformer power plug Output voltage 5 0V 6V Minimum supply current 750mA A 10V peak voltage...

Page 33: ...the serial port is still accessible but all AT commands correlative with RF function or SIM card function will not be accessible If SIM900D has been set by AT CFUN 4 the RF function will be closed th...

Page 34: ...MS from network but the serial port is not accessible Note For SIM900 it requests to set AT command AT CSCLK 2 to enable the SLEEP mode The default value is 0 which can not make the module enter SLEEP...

Page 35: ...rgeable battery RTC Core 10K Module VRTC Large capacitance Capacitor Figure16 RTC supply from capacitor z Li battery backup Coin type Rechargeable Capacitor such as XH414H IV01E form Seiko can be used...

Page 36: ...orts One is the serial port and the other is the debug port The GSM module is designed as a DCE Data Communication Equipment following the traditional DCE DTE Data Terminal Equipment connection The mo...

Page 37: ...and RXD State lines RTS and CTS Control lines DTR DCD and RI z Serial port can be used for CSD FAX GPRS service and send AT command of controlling module Also serial port can be used for multiplexing...

Page 38: ...cribed above Note User can use AT IPR x to set a fixed baud rate and save the configuration to non volatile flash memory After the configuration is saved as fixed baud rate the Unsolicited Result Code...

Page 39: ...bug port do not support the RS_232 level and it only supports the CMOS level Please refer to the table 12 for details about the voltage level User should add the level converter IC between the DCE and...

Page 40: ...ne built into a handfree MIC or headset For each channels user can use AT CMIC to adjust the input gain level of microphone use AT SIDET to set the side tone level In addition user can also use AT CLV...

Page 41: ...erential layout 33pF ESD ANTI ESD ANTI MODULE Figure21 Speaker interface configuration MODULE SPK2P SPK2N Differential layout Amplifier Circuit 10pF 10pF 33p F 33pF 33pF Close to speaker GND GND 1 0 0...

Page 42: ...SD ANTI ESD ANTI MODULE MIC1N MIC1P Figure23 Microphone interface configuration 3 10 3 Earphone Interface Configuration 1 2 4 3 Amphenol SPK2P MIC2N MIC2P 1uF 10R 100R 33pF GND GND GND GND Close to MO...

Page 43: ...e THD 5 at F 1KHz pre amp gain 0 dB PGA gain 0 dB 740 mVrms Table15 Audio Output Characteristics Parameter Conditions Min Typ Max Unit load Resistance 27 32 Ohm Biasing voltage 1 4 V Output swing Volt...

Page 44: ...SIM_RST 8 SIM Card Reset Following figure is the reference circuit about SIM interface SIMCom recommends an Electro Static discharge device ST www st com ESDA6V1W5 or ON SEMI www onsemi com SMF05C for...

Page 45: ...ollowing figure MODULE SMF05C SIM_VDD SIM_CLK SIM_DATA SIM_RST VCC GND RST VPP CLK I O 22R 22R 22R 100nF C707 10M006 512 2 SIM CARD Figure26 Reference circuit of the 6 pin SIM card holder 3 11 2 Desig...

Page 46: ...utomatically the SIM Card power mode one is 3 0V 10 another is 1 8V 10 Current is about 10mA C2 SIM_RST SIM Card Reset C3 SIM_CLK SIM Card Clock C5 GND Connect to GND C6 VPP Not connect C7 SIM_DATA SI...

Page 47: ...Name Signal Description C1 SIM_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 SIM_RST SIM Card Reset C3 SIM...

Page 48: ...PO0 when KBR0 or GPO0 is not used for another function 3 13 ADC SIM900D provides one auxiliary ADC0 General purpose analog to digital converter as voltage input pin which can be used to detect the val...

Page 49: ...established 2 Use AT command ATH the RI will be changed to HIGH SMS Change to low and hold low level for about 120 ms when the module receive a SMS and then it is changed to HIGH URC Some URCs trigge...

Page 50: ...LED lamp The working state of this pin is listed in following table Table22 Working state of the NETLIGHT State SIM900D function Off SIM900D is not running 64ms On 800ms Off SIM900D does not find the...

Page 51: ...GPIO1 Output Pull down The SIM card detection function can be implemented please refer to 3 11 SIM interface for more details 3 17 PWM SIM900D contains one Pulse Width Modulators PWM which can be used...

Page 52: ...or alert tones The tone level can be adjusted over a 24 dB range in 4 dB steps or it can be muted Table24 Pin definition of the PWM Pin Name Pin Number PWM 47 Pulse Width Modulator Signal SIM900D_Har...

Page 53: ...RF output power Frequency Max Min GSM850 33dBm 2db 5dBm 5db EGSM900 33dBm 2db 5dBm 5db DCS1800 30dBm 2db 0dBm 5db PCS1900 30dBm 2db 0dBm 5db 4 2 Module RF Receive Sensitivity Table26 SIM900D conducte...

Page 54: ...T 5 5 V Peak current of power supply 0 3 0 A Voltage at digit pins 0 3 3 1 V II 10 mA IO 10 mA For digital interface pins such as GPIO UART LCD and PWM 5 2 Operating Temperatures The operating tempera...

Page 55: ...rol level for Pout max f 200kHz f 200kHz 50 2 mV POWER DOWN mode SLEEP mode BS PA MFRMS 2 BS PA MFRMS 5 BS PA MFRMS 9 30 1 5 1 2 1 0 uA mA mA mA IDLE mode GSM 850 EGSM 900 DCS1800 PCS1900 22 22 22 22...

Page 56: ...0mA power level 10 Typical 202mA power level 19 Typical 143mA DCS 1800 PCS 1900 power level 0 350mA Typical 300mA power level 10 Typical 139mA power level 15 Typical 126mA DATA mode GPRS 4 Rx 1 Tx CLA...

Page 57: ...atue measured table Temperature 25 Humidity 45 Part Contact discharge Air discharge VBAT 5KV 10KV GND 5KV 10KV RXD TXD 2KV 8KV ANT 5KV 10KV SPK1P 1N SPK2P 2N MIC1P 1N MIC2P 2N 3KV 8KV PWRKEY 2KV 8KV O...

Page 58: ...00D 6 1 Mechanical Dimensions of SIM900D Following shows the Mechanical dimensions of SIM900D top view side view and bottom view Dimensions shown in millimeters Figure34 SIM900D top mechanical dimensi...

Page 59: ...SIM900D Hardware Design Figure36 SIM900D side mechanical dimensions FOOT PRINT RECOMMENDATION Figure37 Recommended PCB decal Unit mm SIM900D_Hardware Design_V1 04 2010 10 09 59...

Page 60: ...45 46 40 47 48 41 31 30 18 29 25 28 24 27 23 22 21 20 19 26 DBG_TXD DBG_RXD RXD TXD STATUS SIM_DATA SIM_CLK SIM_RST SIM_VDD KBR0 RI PWRKEY DISP_CLK DISP_DATA VRTC DISP_D C GND MIC2P MIC2N MIC1N MIC1P...

Page 61: ...1 RI 12 PWRKEY 13 DISP_CLK 14 DISP_DATA 15 VRTC 16 DISP_D C 17 GND 18 MIC2P 19 MIC2N 20 MIC1N 21 MIC1P 22 AGND 23 SPK1P 24 SPK1N 25 SPK2N 26 SPK2P 27 TEMP_BAT 28 VCHG 29 ADC0 30 GND 31 GND 32 GND 33 A...

Page 62: ...SIM900D Hardware Design 6 4 The Ramp Soak Spike Reflow Profile of SIM900D Figure40 The ramp soak spike reflow profile of SIM900D SIM900D_Hardware Design_V1 04 2010 10 09 62...

Page 63: ...ontact us Shanghai SIMCom Wireless Solutions Ltd Add SIM Technology Building A No 633 Jinzhong Road Shanghai P R China 200335 Tel 86 21 3252 3300 Fax 86 21 3252 3020 URL www sim com SIM900D_Hardware D...

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