GE864-AUTO Hardware User Guide
1vv0300779 Rev.0 - 20/06/08
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved
page 14 of 62
4 Hardware
Commands
4.1 Turning ON the GE864-AUTO module
To turn on the GE864-AUTO the pad ON* must be tied low for at least 1 seconds 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-AUTO 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 "*" .
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.
ON*
Power ON impulse
GND
R1
R2
Q1
