EB-3531
Specifications are subject to be changed without notice.
Page 5 of 21
Version 1.2.1
Pin NO. Pin Name
I/O
Remark
1.
RXB
I
Serial input (default null)
2.
TXB
O
Serial output (default null)
3.
TIMEMARK
I/O
One pulse per second.
4.
TXA
O
Serial output (default NMEA)
5.
RXA
I
Serial input (default NMEA)
6. NC
NC
7.
GPIO0
I/O
General purpose I/O
8.
GPIO1
I/O
General purpose I/O
9. RF_PWR
CTR RF
Power
ON/OFF.
10.
ON_OFF
I
Edge triggered soft on/off request. It must be low for normal application.
11.
VBAT
PWR
Backup battery supply voltage
12.
VCC
PWR
Main power supply to the engine board.
13.
GPIO13
I/O
General purpose I/O
14.
GPIO14
I/O
General purpose I/O
15. GPIO15
O
GPS status output.
16.
BOOTSEL
I/O
Set this pin to high for programming flash.
17.
VCC_RF
PWR
Regulated RF power output.
18. GND
G
Ground.
19.
RF IN
RF
GPS antenna input.
20. GND
G
Ground.
21. GND
G
Ground.
22. GND
G
Ground.
