USGlobalsat ET-312 - Manual (Page 4)

ET-312
The Specifications are subject to be changed without notice. Copyright © 2007, GlobalSat Technology.
Page 4 of 21
Version 1.4
2. Technical Information
Block Diagram
Module Pin Assignment:
M1
GPS Engine Board
5
6
7
11
12
13
1
2
3
4
8
9
10
GND
GND
VIN
RX
GND
GND
GND
RF
GND
GND
BATTERY
GPIO1
TX
Pin NO. Pin Name Remark
1. GND Ground.
2. RF Connect to External Active Antenna. While external antenna is used, the
optional power is needed.
3. GND Ground.
4. GND Ground.
5. GND Ground.
6. GND Ground.
7. VIN This is the main DC supply for a 3.3V +- 5% DC input power module board.
8. BATTERY This is the battery backup input that powers the SRAM and RTC when main
power is removed. Typical current draw is 15uA. 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. The battery voltage should be between 2.0v and