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Pin Definitions
Pin No. Title I/O Note
a VIN-1 I Voltage input 5~12V DC (MUST leave open if VIN-2 is used)
b VANT I
Antenna bias voltage input DC 1.8~ 8.0V (connect to ground
if not used)
c VIN-2 I Voltage input 3.3V DC (MUST leave open if VIN-1 is used)
d VBAK I
Backup voltage input 1.95 ~ 3.3V DC (connect to ground if
not used)
e Status O
GPS status (leave open if not used)
f Ground I Ground
g Reset I/O
Reset (active low, leave open if not used)
h 1 PPS O
Time pulse (leave open if not used)
i Reserve I
External interrupt pin (default: internal pull up, leave open if
not used)
j TX2 O
Serial port 2 (leave open if not used)
k RX2 I
Serial port 2 (leave open if not used)
l RX1 I
Serial port 1 (leave open if not used)
m TX1 O
Serial port 1 (leave open if not used)
n Reserve I
Boot mode (in normal operation, leave open if not used)
Table 2.1 Description of pin definition for FV-25
Note: Only either VIN-1 or VIN-2 can be used for voltage input, while VIN-2 is the pin for DC
3.3V and VIN-1 is for DC 5~12V.
Pin No. Title I/O Note
1
VANT
I
Antenna bias voltage input DC 1.8~ 8.0V (connect to ground
if not used)
2
VIN-2
I
Voltage input 3.3V DC (MUST leave open if
VIN-1 is used)
3
Ground
I Ground
4
RX2
I Serial port 2 (leave open if not used)
5
TX1
O Serial port 1 (leave open if not used)
6
VIN-1
I
Voltage input 5~12V DC (MUST leave open if
VIN-2 is used)
7
VBAK
I
Backup input voltage 1.95 ~ 3.3V DC (connect to ground if
not used)
8
1PPS
O Time pulse (leave open if not used)
9
TX2
O Serial port 2 (leave open if not used)
10
RX1
I Serial port 1 (leave open if not used)