PIN #

I/O

Signal Name

Description

1

I

ANT_PWR

DC power to active antenna. Connect 5 or 3 volts, depending on the active antenna being used. Typically 20 to 30ma.

2

I

VCC_5V

Regulated 5.0VDC +/- 5% input power.
180mA typical.

3

I

VBAT

Battery backup input. 2V to VCC + 0.5 V.
10uA typical.

4

I

N/C

5

I

PBRESN

Manual reset input (ground to reset receiver). Leave floating for normal operation. The minimum pulse width is 10 us resulting in a 140 ms reset signal.

6

I/O

GPIO1

General purpose I/O 1

7

I/O

GPIO2

General purpose I/O 2

8

I/O

GPIO3

General purpose I/O 3

9

I/O

GPIO4

General purpose I/O 4

10

I

GND

Ground

11

O

TXA

Port A Serial Transmit Data. VCC CMOS levels.
GPS messages.

12

I

RXA

Port A Serial Receive Data. VCC CMOS levels.
GPS commands.

13

I

GND

Ground

14

O

TXB

Port B Serial Transmit Data. VCC CMOS levels.

15

I

RXB

Port B Serial Receive Data. VCC CMOS levels.
Differential GPS messages.

16

I

GND

Ground

17

I

BOOT

Reserved for re-programming flash

18

I

GND

Ground

19

O

TIMEMARK

1PPS (one pulse per second) output. Normally low with 100ms high pulse once every second

20

I

PWRONOFF

Reserved for future implementation of Push-to-Fix