ER-332
Specifications are subject to be changed without notice.
Page 5 of 14
Version 1.3.1
Pin Assignment
Pin
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
Pin Explanation
* VDC (DC power input):
This is the main DC supply for a 3.8V ~ 6.5V 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 faster start-up offered by a hot or warm
start, a battery backup must be connected. To maximize battery lifetime, the battery voltage should be
between 2.5v and 3.6v.
