User's Manual

GC864 Hardware User Guide

1vv0300733 Rev. 0 - 12/06/06

2 Hardware Commands

2.1 Turning ON the GC864

To turn on the GC864 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 GC864 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 GC864 turns fully on also by supplying power to the Charge pad (provided there's

a battery on the VBATT pads).

ON#

Power ON impulse

GND