User's Manual

GE865 Hardware User Guide
1vv0300799 Rev.11 – 13-07-2010
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 18 of 82
5 Hardware Commands
5.1 Turning ON the GE865
To turn on the GE865 the pad ON# must be tied low for at least 1 second and then
released.
When the power supply voltage is lower than 3.4V the pad ON# must be tied low at least
3 seconds.
The maximum current that can be drained from the ON# pad is 0,1 mA.
A simple circuit to do it is:
NOTE:
Don't use any pull up resistor on the ON# line, it is internally pulled up. Using pull up
resistor may bring to latch up problems on the GE865 power regulator and improper
power on/off of the module. The line ON# must be connected only in open collector
configuration.
ON#
Power ON impulse
GND
R1
R2
Q1