sim900 hardware
TRANSCRIPT
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SIM900 Hardware Overview
(Top View)
The GPRS/GSM engine for the global market. Quad-band : GSM850, EGSM900, DCS1800, PCS1900GPRS multi-slot : Class 10 / Class 8GPRS class : Class BGPRS coding schemes : CS-1, CS-2, CS-3, CS-4 Voice coders : HR, FR, EFR, AMR
Noise SuppressionEcho Cancellation
Encryption : A5/1, A5/2, A5/3RF : SAIC (Single antenna interference cancellation) Input voltage: 3.4~4.5VSleep mode current consumption: 1.5mAOperation temperature: -30℃~+80 ℃
Application:M2MSmart phoneTracker
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SIM900 Hardware Feature
Tiny Configuration Size: 24 X 24X 3 mm (SMT), Weight: 3.4g,
Packing : Auto-tray, Tape & Reel Low Power Consumption
Sleep Mode : 1.5 mAHigh-Speed Processing
ARM926EJ-S (156MHz), Ceva-Teak(DSP)
Multiple Periphery Interface68Pins(UART, SPI, I2C, PWM, GPIO, ADC)
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Platform SolutionChipset Solution PNX4851 :
A single-chip integrated baseband processor and transceiver ICRF7161 :
RF Power Amplifier supporting quad-bandMemory Chipset (ST/SA) :
NOR Flash + RAM Memory
Software SolutionRTOS :
RTK-EProtocol Stack:
3GPP GSM/GPRS R99
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CertificationSIM900 Certification Schedule :
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Pins Diagram
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Power SupplyVBAT --- Input Pin
Design Rule : Vmax = 4.5V, Vmin = 3.4V, Vnorm = 4.0V, Peak Current : 2 A
Any voltage drops that may occur in a transmit burst should notexceed 400mV.
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Power SupplyThe Power Supply Circuit of the evaluation board
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Power Supply
VDD_EXT --- Output PinVoltage Reference for the Digital Interface. Output Voltage : Vmax = 2.95 V, Vmin = 2.6 V, Vnorm = 2.80 V, Design Rule : Iout(max) = 10mALogic Voltage Level :
VILmax=0.15 *VDD_EXT, VIHmin=0.85*VDD_EXT, VILmin= 0V, VIHmax= VDD_EXT, VOHmin= VDD_EXT - 0.1V, VOLmax=0.1V VOHmax= VDD_EXT, VOLmin= 0V
VRTC --- Input or Output Pin – Power input pin, – Design Rule : Vmax=3.15V, Vmin=2.0V, Vnorm=3.0V
Iout(max)= 300uA, Iin=2 uA
GND --- Ground
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Turn on, Turn off, ResetPWRKEY --- Input Pin
be used to turn on or turn off SIM900
Timing of turning on
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Turn on, Turn off, Reset
Timing of turning off
NRESET --- Input PinReset SIM900 : Driving the pin low for at least 50uS.
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Serial PortTXD, RXD, CTS, RTS, DSR, DTR, DCD, RI
TXD, RXD --- Data LineCTS, RTS --- Hardware Flow Control LineDTR --- Sleep Mode Control LineDCD --- Data ModeRI --- Incoming Call, SMS, Arouse host.DSR --- Reserve
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SIM InterfaceSIM_VDD, SIM_DATA, SIM_CLK, SIM_RST, SIM_PRESENCE
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RF interfaceRF_ANT
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RF Interface
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Audio InterfaceMIC_P, MIC_N, SPK_P, SPK_N
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Debug PortDBG_TXD, DBG_RXD
– Updating Firmware & Capturing Debugging Trace. – It’s recommended the interface is lead to a connector.
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OthersADC
– Input Voltage Range : 0 ~ 3 V– AT+CADC?
+CADC: 1,50
NETLIGHT
GPRS communication64ms On/ 300ms Off
SIM900 find the network64ms On/ 3000ms Off
SIM900 does not find the network64ms On/ 800ms Off
SIM900 is not runningOff
SIM900 functionState
PWRKEYOUT, DISP_DATA,DISP_CLK,DISP_C/D,DISP_CS,LINEIN_R,LINEIN_L,PWM1, PWM2, KBR0~KBR4, KBC0~KBC4, GPIO11, GPIO12
---these pins are available in the customized firmware!
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Evaluation Board Kit
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Update FirmwareSIM900 Flash Loader
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Capture Debug LogSpyTracer
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Q&A