M.2 GPS
Users Guide
Document: CTIM-000454
Revision: 0.01
Page 11 of 13
Date: 2021-03-01
FWD
The forward/reverse signal is an ESD protected input used on modules that support Automotive Dead
Reckoning. This signal is used to indicate the moving direction of the module. An active high indicates
moving forward and a low for moving backwards. If the forward/reverse information is available from a
host processor, then this information can be provided to the module using software messages in the
UBX protocol. For more information see the Receiver Description Including Protocol Specification
document for your GPS receiver found in the Software Support section of this document. On modules
that do not support Automotive Dead Reckoning, this signal should be left floating. Do not exceed 3.6V
on this signal.
External Battery
The external battery input in an ESD protected input from the External I/O Connector to the backup
voltage supply of the GPS receiver. The purpose of a battery signal is to power internal memory for GPS
almanac, ephemeris, and last position retention through power cycles. The voltage on this input signal
should be greater than 2.0V and less than 3.6V. The supply of this signal should be able to provide at
least 20uA continuous at room temperature, and 50uA at +85 degrees Celsius.
Local Battery and BAT_EN Header
There is a local battery supply on the M.2 GPS. The purpose of a battery signal is to power internal
memory for GPS almanac, ephemeris, and last position retention through power cycles. The design
includes a MS621 rechargeable battery which recharges itself when the unit is powered on. When
power is removed from the unit the GPS receiver will typically consumer 15uA on its battery supply
input at room temperature and 24uA at 85 degrees Celsius.
On-Board Indicator LEDs
LED
Description
TIMEPULSE
TIMEPULSE visual indicator. This LED will blink at the rate and duty cycle of the
TIMEPULSE output.
PWR
ON: indicates the module is powered on and enabled
OFF: indicated the module is not powered and is disabled
*the module is enabled/disabled using the W_DISABLE1# input from the M.2 card
edge connector
