GC864-QUAD-C2/PY-C2 Hardware User Guide
1vv0300744 Rev.1 - 24/10/06
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved
page 9 of 27
4 Hardware
Commands
4.1 Turning ON the GC864-C2
To turn on the GC864-C2
the
ON#
line
must be tied low for at least 1 second and then released.
The maximum current that can be drained from the
ON#
line
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 GC864-C2 power regulator and improper power on/off of the module. The ON# line 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.
ON#
Power ON impulse
GND
R1
R2
Q1
