GMM-U1 Datasheet, PDF (13/36 Pages) List of Unclassifed Manufacturers – GPS Module

GlobalTop Technology
Gmm-u1 Data Sheet
13 _{Ver. V0G}
3D-FIX, Pin13
The 3D-FIX is assigned as a fix flag output. The timing behavior of this pin can be
configured by custom firmware for different applications (Example: waking up host MCU).
If not used, keep floating.
Before 2D Fix
The pin should continuously output one-second high-level with one-second low-level
signal
1s
1s
After 2D or 3D Fix
The pin should continuously output low-level signal
Low
1PPS, Pin14
This pin provides one pulse-per-second output from the module, which is synchronized to
GPS time. If not used, keep floating; default duration 100ms
GND, Pin15
Ground
RF_IN, Pin16
GPS RF signal input. Both passive and active antennas are supported.
When using an external active antenna, the power will need to be sourced from an
external DC voltage as this is not supplied internally. The voltage should be kept between
3.0V~10.0V, Typical 3.0V
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