SIM808 core board GSM / GPRS / GPS / BLUETOOTH module

 2.1 SIM808 Module featureQuad-Band GSM 850/900/1800/1900MHzGPRS multi-slot class 12/10GPRS mobile station class BCompliant to GSM phase 2/2+      -Class 4 (2 W 850/900 MHz)      -Class 1 (1 W 800/1900MHz)Control via AT commands (3GPP TS 27.007,27.005 and SIM Com enhanced AT Commands)Supply voltage range:3.4v~4.4v     Low power consumptionGPS Receiver type      22tracking/66 acquisition-channel GPS L1 C/A codeSensitivity       Tracking: -165 dBm           Cold starts:          -147 dBm   Time-To-First-Fix      Cold start:          30s (typ)      Warm start:         28s (typ)      Hot start:           1s (typ) Accuracy      Horizontal Position:     <2.5m CEP 2.2 PCBA overview   Note: PWRIN range is from 5.0V to 10V, 5.0V is recommended,TXD /RXD are TTL level which can be directly connected with MCU.3.1 Pin definition of 6pin connector Pin name Pin number Mark on PCB Description Comment SLEEP 0 S  control module into sleep mode Connect with DTR via R124 GND 1,6 G GND   PWRIN 2 V The power supply        5V-10V PWRKEY 3 K Power down Shorted with GND via R104 by default TXD 4 T Transmit Data TTL Series data Output RXD 5 R Receives Data TTL Series data Input    3.2How to use TXD and RXD (Default baud rate is 9600bps)4. How to test the Dev808 EVB by AT command4.1 Installing GSM antenna,GPS antenna and SIM card for BK-SIM808 Board,Feed power supply to PWRIN pin, LED indicator D102 will be lighted. (Note: PWRIN range is from 5.0V to 10V. 5.0V is recommended)4.2 D100 LED indicator, Blink quickly shows un-registration network,Blink slowly shows registration successful.(Note: Should confirm whether SIM card is inserted)