USGlobalsat ET-316A - Manual (Page 5)

ET-316A
The Specifications are subject to be changed without notice. Copyright © 2007, GlobalSat Technology.
Page 5 of 17
Version 1.2
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
5.0v.
9. GPIO1 User can use this I/O pin for special function.For example, on/off LED
10. TX This is the main transmits channel for outputting navigation and
measurement data to user’s navigation software or user written
software.Output TTL level, 0V ~ 2.85V
11. RX This is the main receive channel for receiving software commands to the
engine board from SiRFdemo software or from user written software.
12. GND Ground.
13. GND Ground.
14. TXB NC
15. RXB NC