SIM900 Hardware Design
Fanbing.Kong@sim.com Jan.,2010
SIM900 Hardware Overview
The GPRS/GSM engine for the global market. Quad-band : GSM850, EGSM900, DCS1800, PCS1900 GPRS multi-slot : Class 10 / Class 8 GPRS class : Class B GPRS coding schemes : CS-1, CS-2, CS-3, CS-4 Voice coders : HR, FR, EFR, AMR Noise Suppression Echo Cancellation Encryption : A5/1, A5/2, A5/3 RF : SAIC (Single antenna interference cancellation) Input voltage: 3.4~4.5V Sleep mode current consumption: 1.5mA Operation temperature: -30~+80
(Top View)
Application:
M2M Smart phone Tracker
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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 mA High-Speed Processing ARM926EJ-S (156MHz), Ceva-Teak(DSP) Multiple Periphery Interface 68Pins(UART, SPI, I2C, PWM, GPIO, ADC)
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Platform Solution
Chipset Solution PNX4851 : A single-chip integrated baseband processor and transceiver IC RF7161 : RF Power Amplifier supporting quad-band Memory Chipset (ST/SA) : NOR Flash + RAM Memory Software Solution RTOS : RTK-E Protocol Stack: 3GPP GSM/GPRS R99
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Certification
SIM900 Certification Schedule :
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Pins Diagram
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Power Supply
VBAT --- 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 not exceed 400mV.
7
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Power Supply
The Power Supply Circuit of the evaluation board
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Power Supply
VDD_EXT --- Output Pin Voltage Reference for the Digital Interface.
Output Voltage : Vmax = 2.95 V, Vmin = 2.6 V, Vnorm = 2.80 V, Design Rule : Iout(max) = 10mA Logic 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, Reset
PWRKEY --- Input Pin be used to turn on or turn off SIM900
Timing of turning on
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10
Turn on, Turn off, Reset
Timing of turning off NRESET --- Input Pin Reset SIM900 : Driving the pin low for at least 50uS.
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11
Serial Port
TXD, RXD, CTS, RTS, DSR, DTR, DCD, RI
TXD, RXD CTS, RTS DTR
--- Data Line --- Hardware Flow Control Line --- Sleep Mode Control Line
DCD RI DSR
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--- Data Mode --- Incoming Call, SMS, Arouse host. --- Reserve
12
SIM Interface
SIM_VDD, SIM_DATA, SIM_CLK, SIM_RST, SIM_PRESENCE
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13
RF interface
RF_ANT
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14
RF Interface
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15
Audio Interface
MIC_P, MIC_N, SPK_P, SPK_N
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16
Debug Port
DBG_TXD, DBG_RXD
Updating Firmware & Capturing Debugging Trace. Its recommended the interface is lead to a connector.
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17
Others
ADC
Input Voltage Range : 0 ~ 3 V AT+CADC? +CADC: 1,50
NETLIGHT
State Off 64ms On/ 800ms Off 64ms On/ 3000ms Off 64ms On/ 300ms Off SIM900 function SIM900 is not running SIM900 does not find the network SIM900 find the network GPRS communication
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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18
Evaluation Board Kit
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19
Update Firmware
SIM900 Flash Loader
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20
Capture Debug Log
SpyTracer
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Q&A
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