Telit Wireless Solutions GE863 - Manual (Page 9)

GE863-GPS Software User Guide
1vv0300724 Rev. 2 - 24/01/07
2.3 Turning ON the GE863-GPS
To turn on the GE863-GPS the pin ON# must be tied low for at least 1 second and then released.
A simple circuit to do it is:
ON#
Power ON impulse
GND
NOTE: don't use any pull up resistor on the ON# line. Using pull up resistor may bring to latch
up problems on the GE863-GPS power regulator and improper power off of the module. The
line ON# must be connected only in open collector configuration.
TIP: To check if power has raised it is possible to monitor the PWRMON line, when this line
goes high the module is powered on, but before it remains on the device needs other 900 ms
for software startup. Hence check the PWRMON line and 900 ms after its transition to high it is
possible to release the ON# pin.
When turning on the module, both devices (GSM and GPS) will be started.
The GPS antenna will be supplied and the receiver will start the scanning activity to achieve the Fix.
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