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SIM900D Hardware Design

RTC

Core

10K

Module

VRTC

Rechargeable

Backup Battery

Figure14: RTC supply from rechargeable battery

RTC

Core

10K

Module

VRTC

Large-capacitance

Capacitor

Figure15: RTC supply from capacitor

z

Li-battery backup

Coin-type Rechargeable Capacitor such as XH414H-IV01E form Seiko can be used.

Typical charge curves for each cell type are shown in following figures. Note that the rechargeable Lithium type
coin cells generally come pre-charged from the vendor.

Figure16: Seiko XH414H-IV01E Charge Characteristic

SIM900D_HD_V1.02

09.04.2010

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Summary of Contents for SIM900D HD

Page 1: ...a Hardware Design SIM900D_HD_V1 02...

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: ...n Off 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 30 3 5 3 Implemented charging technique 30...

Page 4: ...GPIO 48 3 17 PWM 49 4 Antenna Interface 50 4 1 Module RF Output Power 50 4 2 Module RF Receive Sensitivity 50 4 3 Module Operating Frequencies 51 5 Electrical Reliability and Radio Characteristics 51...

Page 5: ...ERISTICS 43 TABLE15 PIN DEFINITION OF THE SIM INTERFACE 44 TABLE16 PIN DESCRIPTION AMPHENOL SIM CARD HOLDER 46 TABLE17 PIN DEFINITION OF THE LCD INTERFACE 46 TABLE18 ADC SPECIFICATION 46 TABLE19 BEHAV...

Page 6: ...4H IV01E CHARGE CHARACTERISTIC 35 FIGURE17 CONNECTION OF THE SERIAL INTERFACES 37 FIGURE18 CONNECTION OF SOFTWARE UPGRADE AND SOFTWARE DEBUG 38 FIGURE19 RS232 LEVEL CONVERTER CIRCUIT 39 FIGURE20 SPEAK...

Page 7: ...gin Jing zhou Changed GHOST mode to Charge only mode 3 4 1 1Update the Figure8 Timing of turn on system using PWRKEY 3 4 2 1Update the Figure9 Timing of turn off system using PWRKEY 2010 04 09 1 02 4...

Page 8: ...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 Us...

Page 9: ...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 Com...

Page 10: ...nt also referred to as DTE TX Transmit Direction UART Universal Asynchronous Receiver Transmitter URC Unsolicited Result Code USSD Unstructured Supplementary Service Data VSWR Voltage Standing Wave Ra...

Page 11: ...alth care facility observe the restrictions about the use of mobiles Switch the cellular terminal or mobile off medical equipment may be sensitive to not operate normally for RF energy interference Sw...

Page 12: ...in all conditions for example no mobile fee or a invalid SIM card While you are in this condition and need emergent help Please Remember using emergency calls In order to make or receive calls the ce...

Page 13: ...ly z Two audio channels include two microphone inputs and two speakers outputs This can be easily configured by AT command With the charge circuit integrated inside the SIM900D it is very suitable for...

Page 14: ...col usually used for PPP connections z 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 Unstruc...

Page 15: ...by debug port Note The SIM900D does work but deviations from the GSM specification may occur Table4 Coding schemes and maximum net data rates over air interface Coding scheme 1 Timeslot 2 Timeslot 4 T...

Page 16: ...erial 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 Board...

Page 17: ...SIM900D Hardware Design SIM900D_HD_V1 02 09 04 2010 17 Figure2 Top view of SIM900D EVB For details please refer to the SIM900 EVB_UGD document...

Page 18: ...E I O DESCRIPTION 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 4V 4 5V It must be a...

Page 19: ...P SPK1N O Positive and negative voiceband output If unused keep open SPK2P SPK2N O Auxiliary positive and negative voiceband output If unused keep open AGND Analog ground Separate ground connection fo...

Page 20: ...7V VOLmax 0 1V VOHmax 3V VOLmin 0V If unused keep open SIM interface PIN NAME I O DESCRIPTION DC CHARACTERISTICS COMMENT SIM_VDD O Voltage supply for SIM card The voltage can be select by software aut...

Page 21: ...sent or received In this case power consumption depends on network settings and GPRS configuration Normal operation GPRS DATA There is GPRS data transfer PPP or TCP or UDP in progress In this case po...

Page 22: ...ombination of low ESR and small size but may not be cost effective A lower cost choice may be a 100 F tantalum capacitor low ESR with a small 0 1 F to 1 F ceramic in parallel which is illustrated as f...

Page 23: ...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 Minimizing Power Losses When designing the power supply for your applicati...

Page 24: ...3 4 1 Turn on SIM900D SIM900D can be turned on by two ways which are described in following chapters z Via PWRKEY pin starts normal operating mode please refer to chapter 3 4 1 1 z Via VCHG Pin start...

Page 25: ...e STATUS OUTPUT VIL 1 2V VIH 2 6V Pulldown 1s VBAT PWRKEY INPUT VOH 2 7V Delay 2 2s Serial Port Undefined Active Figure8 Timing of turn on system using PWRKEY When power on procedure completes the SIM...

Page 26: ...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 command z Over voltage or...

Page 27: ...the AT 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 5V the following URC will be pre...

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

Page 29: ...these specifications is also important for the AT command AT CBC to monitor the voltage of battery or the AT CBC may return incorrect battery capacity values z The maximum charging voltage of the Li I...

Page 30: ...charge state The VBAT give out charging current from SIM900D module to external battery TEMP_BAT Pin is for user to measure the battery temperature Just let this Pin open if battery temperature measu...

Page 31: ...s operating mode That means that when the GSM engine is in Normal mode SLEEP IDLE TALK GPRS IDLE or GPRS DATA mode charging can be in progress while SIM900D remains operational In this case the voltag...

Page 32: ...AT CCLK Set data and time of RTC AT CPOWD Power down AT CBC Indicated charge state and voltage AT CFUN Start or close the protocol Set AT command AT CFUN 1 module can be transferred from Charge only m...

Page 33: ...to document 1 3 6 2 Sleep Mode Slow Clock Mode The SIM900D can be controlled to enter or exit the SLEEP mode in customer applications through DTR signal When DTR is in high level and there is no on a...

Page 34: ...e can be provided by an external capacitor or a battery rechargeable or non chargeable through the VRTC Note If the RTC function is enabled a battery or capacitor should be connected with the VRTC pin...

Page 35: ...igure15 RTC supply from capacitor z Li battery backup Coin type Rechargeable Capacitor such as XH414H IV01E form Seiko can be used Typical charge curves for each cell type are shown in following figur...

Page 36: ...ication 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 Autobauding su...

Page 37: ...to automatically detect the baud rate configured in the host application The serial port of the GSM engine supports autobauding for the following baud rates 1200 2400 4800 9600 19200 38400 57600bps F...

Page 38: ...are Upgrade and Software Debug The DBG_TXD DBG_RXD and GND must be connected to the IO connector when user need to upgrade software and debug software the DBG_TXD DBG_RXD should be used for software u...

Page 39: ...SIM900D Hardware Design SIM900D_HD_V1 02 09 04 2010 39 MODULE DCD TXD CTS RI RXD DTR RTS Figure19 RS232 level converter circuit...

Page 40: ...rmined by control register settings and established using analog multiplexers For each channels the AT CMIC can be used to adjust the input gain level of microphone use AT SIDET to set the side tone l...

Page 41: ...D Differential layout 33pF ESD ANTI ESD ANTI MODULE Figure20 Speaker interface configuration MODULE SPK2P SPK2N Differential layout Amplifier Circuit 10pF 10pF 33p F 33pF 33pF Close to speaker GND GND...

Page 42: ...MODULE MIC1N MIC1P Figure22 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 MODULE Close to So...

Page 43: ...voltage THD 5 at F 1KHz pre amp gain 0 dB PGA gain 0 dB 740 mVrms Table14 Audio Output Characteristics Parameter Conditions Min Typ Max Unit load Resistance 27 32 Ohm Biasing voltage 1 4 V Output swin...

Page 44: ...n definition of the SIM interface Pin Name Pin Number Function SIM_VDD 9 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...

Page 45: ...D Figure24 Reference circuit of the 6 pins SIM card 3 11 2 Design Considerations for SIM Card Holder For 6 pins SIM card holder that be recommend to use Amphenol C707 10M006 512 2 User can visit http...

Page 46: ...unction is not supported in the default firmware There must be some customized firmware if you want Please contact SIMCom for more details The DISP_RST can select the KBR0 or GPO0 in addition to the K...

Page 47: ...When receive SMS The RI will change to LOW and hold low level about 120 ms then change to HIGH URC Some URCs triggers 120ms low level on RI For more details please refer to document 10 If the module...

Page 48: ...not find the network 64ms On 3000ms Off SIM900D find the network 64ms On 300ms Off GPRS communication Provide a reference circuit for user shown as following figure 300R 4 7K 47K MODULE NETLIGHT VBAT...

Page 49: ...bit resolution for buzzer tone frequency generation from 200 Hz to 5 kHz Tone frequency error 1 for all standard piano notes from 200 Hz to 5 kHz Tone level control from 0 dB down to 24 dB in 4 dB st...

Page 50: ...lated pad Table23 Pin Definition of the ANT Pin Name Pin Number ANT 33 RF antenna interface 4 1 Module RF Output Power Table24 SIM900D conducted RF output power Frequency Max Min GSM850 33dBm 2db 5dBm...

Page 51: ...resses beyond any of these limits will cause permanent damage to SIM900D Table27 Absolute maximum ratings Parameter Min Max Unit VBAT 5 5 V Peak current of power supply 0 3 0 A Voltage at digit pins 0...

Page 52: ...x 300 mV VBAT Voltage ripple Normal condition power control 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...

Page 53: ...wer level 19 Typical 88mA DCS 1800 PCS 1900 power level 0 200mA Typical 170mA power level 10 Typical 88mA power level 15 Typical 80mA DATA mode GPRS 3 Rx 2 Tx CLASS 10 GSM 850 EGSM 900 power level 5 4...

Page 54: ...hroughout the processing handing and operation of any application using a SIM900D module The measured values of SIM900D are shown as the following table Table31 The ESD endure statue measured table Te...

Page 55: ...ibes the mechanical dimensions of SIM900D 6 1 Mechanical Dimensions of SIM900D Following shows the Mechanical dimensions of SIM900D top view side view and bottom view Dimensions shown in millimeters F...

Page 56: ...SIM900D Hardware Design SIM900D_HD_V1 02 09 04 2010 56 Figure30 SIM900D bottom view Figure31 SIM900D SIDE view...

Page 57: ...SIM900D Hardware Design FOOT PRINT RECOMMENDATION Figure32 Footprint recommendation SIM900D_HD_V1 02 09 04 2010 57...

Page 58: ...39 44 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...

Page 59: ...KBR0 11 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 G...

Page 60: ...SIM900D Hardware Design 6 4 The Ramp Soak Spike Reflow Profile of SIM900D Figure35 The ramp soak spike reflow profile of SIM900D SIM900D_HD_V1 02 09 04 2010 60...

Page 61: ...ct 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 SI...

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