sim900 hardware
TRANSCRIPT
SIM900 Hardware Design
[email protected] Jan.,2010
SIMCom All right Reserved 2
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
SIMCom All right Reserved 3
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)
SIMCom All right Reserved 4
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
SIMCom All right Reserved 5
CertificationSIM900 Certification Schedule :
SIMCom All right Reserved 6
Pins Diagram
SIMCom All right Reserved 7
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.
SIMCom All right Reserved 8
Power SupplyThe Power Supply Circuit of the evaluation board
SIMCom All right Reserved 9
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
SIMCom All right Reserved 10
Turn on, Turn off, ResetPWRKEY --- Input Pin
be used to turn on or turn off SIM900
Timing of turning on
SIMCom All right Reserved 11
Turn on, Turn off, Reset
Timing of turning off
NRESET --- Input PinReset SIM900 : Driving the pin low for at least 50uS.
SIMCom All right Reserved 12
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
SIMCom All right Reserved 13
SIM InterfaceSIM_VDD, SIM_DATA, SIM_CLK, SIM_RST, SIM_PRESENCE
SIMCom All right Reserved 14
RF interfaceRF_ANT
SIMCom All right Reserved 15
RF Interface
SIMCom All right Reserved 16
Audio InterfaceMIC_P, MIC_N, SPK_P, SPK_N
SIMCom All right Reserved 17
Debug PortDBG_TXD, DBG_RXD
– Updating Firmware & Capturing Debugging Trace. – It’s recommended the interface is lead to a connector.
SIMCom All right Reserved 18
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!
SIMCom All right Reserved 19
Evaluation Board Kit
SIMCom All right Reserved 20
Update FirmwareSIM900 Flash Loader
SIMCom All right Reserved 21
Capture Debug LogSpyTracer
SIMCom All right Reserved 22
Q&A