User's Manual

GE/GC864-QUAD V2 and GE864-GPS Hardware User Guide
1vv0300915 Rev.2 – 2011-06-15
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights
Reserved. Page 34 of 97
Let us assume you need to drive the RESET# pad with a totem
pole output from +1.8V up to 5V microcontroller
This signal is internally pulled up so the pin can be left
floating if not used.
5.4. Turning ON/OFF the GPS (only GE864-GPS)
When GPS is not in GSM controlled mode (controlled by GSM) a
specific sequence to power-up and shutdown it’s needed.
5.4.1. GPS Power-up
After you first apply power the GPS part of GE864-GPS goes
into a low-power mode status. To switch ON the GPS part is
requested a pulse at the input pin GPS_ON_OFF. In order to
know when the GPS is ready to accept the pulse, the
application in the host controller can either:
- Wait for a fixed interval
- Monitor a pulse on GPS_WAKEUP output