3
PinNumber
Name
Description
Type
1 VANT
Antenna
DC
Voltage
Input
2
VDC
3.8V~6.5V DC Power Input
Input
3 VBAT
Backup
Battery
Input
4
VDC
(Shorted with pin 2)
Input
5
PBRES
Push Button Reset Input (Active Low)
Input
6 RESERVED
(Reserved)
7
SELECT
Down-load data from RS232 to flash
ROM (Reserved)
8 RESERVED
(Reserved)
9 RESERVED
(Reserved)
10 GND
Ground
11
TXA
Serial Data Output A (GPS Data)
Output
12
RXA
Serial Data Input A (Command)
Input
13 GND
Ground
14
TXB
Serial Data Output B (No Used)
Output
15
RXB
Serial Data Input B (DGPS Data)
Input
16 GND
Ground
17 RESERVED
(Reserved)
18 GND
Ground
19
TIMEMARK
1PPS Time Mark Output
Output
20 RESERVED
(Reserved)
Interface description
* VANT (antenna DC power input):
DC voltage is for active antenna.
* 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 or Gold-capacitor,
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, either a battery backup must be connected or a
Gold-capacitor should be installed. To maximize battery lifetime, the battery voltage should not
exceed the supply voltage and should be between 2.5v and 3.6v.
* PBRES (Push button reset):
This pin provides an active-low reset input to the engine board. It causes the engine board to
