Interface Connection
* Pin-out of the 12-pin interface connector
Pin
Number
Name
Description
Type
1
GND
Ground
2
VBAT
Backup Battery
Input
3
VDC
3.8V~5.5V DC Power Input
Input
4
PBRES
Push Button Reset Input (Active Low)
Input
5
GPIO1
(Reserved)
6
TXA
Serial Data Output A (GPS Data)
Output
7
RXA
Serial Data Input A (Command)
Input
8
GND
Ground
9
GND
Ground
10
SELECT
(Reserved)
11
TIMEMARK
1PPS Time Mark Output
Output
12
GND
Ground
Interface description
* VDC (DC power input):
This is the main DC supply for a 3.8V ~ 5.5V power module board.
* VBAT (Backup battery):
This is the battery backup input that powers the SRAM and RTC when main
power is removed .Typical current draw is 10uA. Without an external backup battery,
the module/engine board will execute a cold star after every turn on. To achieve the
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