User's Manual

SIM548C EVB User Guide
SIM548C-EVB_ UGD _V1.01 04.05.2008
20
4.5 GPS serial ports and power
Figure 17: 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 O Power supply for 3V active antenna.
6 GPS_VANT I
External DC power supply for an active
antenna.
7 GPS_VCC_RF O Power supply for 3V active antenna.
8 GPS_VRTC I Apply 3V dc for backup RTC & SRAM.
9 GND GND
10 GND GND