User's Manual

Telit GM862-QUAD/-QUAD-PY

Hardware User Guide

1vv0300692, Rev. ISSUE#0, - 04/10/2005

2 Hardware Commands

2.1 Turning ON the GM862-QUAD

To turn on the GM862-QUAD the pin ON# must be tied low for at least 1 second and then released.

The maximum current that can be drained from the ON# pin 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 GM862-QUAD 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.

TIP: To check if power has raised it is possible to monitor the START 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 PWRCTL line and 900 ms after its transition to high it is possible to release the ON#

pin.

ON#

Power ON impulse

GND