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GE864 Hardware User Guide
1vv0300694 Rev.10 - 10/06/08
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 15 of 69
4 Hardware Commands
4.1 Turning ON the GE864-QUAD / PY
To turn on the GE864-QUAD / PY the pad ON# must be tied low for at least 1 second and then
released.
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 GE864-QUAD / PY power regulator and improper power on/off of the module. The line ON#
must be connected only in open collector configuration.
NOTE: In this document all the lines that are inverted, hence have active low signals are labeled with a name that
ends with a “#” or with a bar over the name.
NOTE: The GE864-QUAD / PY turns fully on also by supplying power to the Charge pad (Module provided with a
battery on the VBATT pads).
TIP: To check if the device has powered on, the hardware line PWRMON should be monitored. After 900ms the line
raised up the device could be considered powered on.
PWRMON line rises up also when supplying power to the Charge pad
ON#
Power ON impulse
GND
R1
R2
Q1