User's Manual

GM862-QUAD / PY Hardware User Guide

1vv0300748 Rev. 1 - 24/10/06

3 Hardware Commands

3.1 Turning ON the GM862-QUAD / PY

To turn on the GM862-QUAD / PY 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 / 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 labelled 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 PWRMON 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

PWRMON line and 900 ms after its transition to high it is possible to release the ON# pin.

ON#

Power ON impulse

GND