SIM508 EVB User Guide
SIMCOM
4.5 GPS serial ports and power
Figure 18: GPS serial ports
Pin
Signal
I/O
Description
1 GPS_TXB O
2 GPS_TXA O
3 GPS_RXB I
4 GPS_RXA I
GPS serial interface.
5 GPS_VCC_RF I Power
supply for 3V active antenna.
6 GPS_VANT I
External DC power supply for an active
antenna.
7 GPS_VCC_RF I
Power supply for 3V active antenna.
8
GPS_VRTC
I
Apply 3V dc for backup RTC & SRAM.
9 GND
GND
10 GND
GND
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