M.2 GPS
Users Guide
Document: CTIM-000454
Revision: 0.01
Page 10 of 13
Date: 2021-03-01
DETAILED FEATURE DESCRIPTION
USB
The M.2 GPS uses a USB 2.0 Full Speed (12Mb/s) interface as the primary communication bus. The USB
interfaces is connected between the GPS receiver and the M.2 card edge connector (pins 7/9).
TIMEPULSE
The TIMEPULSE output is a buffered and ESD protected signal from the GPS receiver. This signal
connects to pin 2 of the External I/O Connector. It also drives the TIMEPULSE LED. By default, when
satellites are not fixed this signal is High (3.3V). When satellites are fixed, this signal pulses at 1 pulse-
per-second (1Hz) with a 20% duty cycle (200ms High, 800ms Low). For more information see the
Receiver Description Including Protocol Specification document for your GPS receiver found in the
Software Support section of this document.
W_DISABLE1#
The W_DISABLE# input from the M.2 card edge connector (pin 8) can be used to enable and disable
power to the M.2 GPS module. When W_DISABLE1# is low, the module is disabled and no power is
applied to the M.2 GPS. When W_DISABLE1# is High, the module is enabled and powered on. This signal
is locally pulled up to 3.3V through a 100K ohm resistor.
External Interrupt Input/WHEELTICK Input
The external interrupt/WHEELTICK input is an ESD protected input signal from the external I/O
connector to the GPS receiver. On modules that do not support Automotive Dead Reckoning, this signal
will always be an External Interrupt input, and this input can be used for control of the GPS receiver or
for aiding. On modules that support Automotive Dead Reckoning (M2G205/M2G206), this signal is by
default used as the WHEELTICK input and is used to provide speed pulse information to the module. If
the speed pulse information is available from the host processor, then the information can be provided
using software messages in the UBX protocol. If using software messages to provide speed pulse
information, this signal can be configured as an external interrupt input. See the Receiver Description
Including Protocol Specification document for your GPS receiver found in the Software Support section
of this document. If this signal is not used, it should be left floating. Do not exceed 3.6V on this signal.
