User`s guide

Chapter 3 - Receiver Descriptions

The following table lists the assigned signal connections of the M12+ receiver's power/data

connector.

Table 3.1: M12+ Power/Data Connector Pin Assignments

Pin # Signal Name Description

1 TxD1 Transmit Data (3V logic)

2 RxD1 Receive Commands (3V logic)

3 +3V PWR Regulated 3Vdc Input

4 1PPS 1 pulse-per-second output

5 Ground Signal and Power common

6 Battery Optional External Backup

7 Reserved Not currently used

8 RTCM In RTCM correction input

9 Antenna Bias 3V-5V antenna bias input

10 Reserved Not currently used

M12+ Nominal Voltage and Current Ranges

Main Power

Voltage: 2.85V to 3.15V regulated, 50 mV peak-to-peak ripple

Current: 65 mA maximum (without antenna)

Backup Battery (Externally applied backup power)

Voltage: 2.2V to 3.2V

Current: 5 µA typical @ 2.7V and 25°C ambient temperature

Backup power retains the real-time-clock, position, satellite data, user commanded operating

modes, and message formatting.

Motorola GPS Products - M12+ User's Guide Revision 6.X 09FEB05