User's Manual

Table Of Contents

GC864 Hardware User Guide

1vv0300733 Rev.12 – 2009-06-04

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To check if the device has powered off, the hardware line PWRMON must be

monitored. When PWRMON goes low, then the device has powered off.

5.2.1. Hardware Unconditional Restart

WARNING:

The hardware unconditional Restart must not be used during normal operation of the

device since it does not detach the device from the network. It shall be kept as an

emergency exit procedure to be done in the rare case that the device gets stacked

waiting for some network or SIM responses.

To unconditionally Restart the GC864-QUAD / PY, the pad RESET# must be tied low

for at least 200 milliseconds and then released.

The maximum current that can be drained from the ON# pad is 0,15 mA.

A simple circuit to do it is:

NOTE:

Do not use any pull up resistor on the RESET* line nor any totem pole digital output.

Using pull up resistor may cause latch up problems on the GC864-QUAD / PY power

regulator and improper functioning of the module. The line RESET* must be

connected only in open collector configuration.

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The unconditional hardware reboot must always be implemented on the boards and

the software must use it as an emergency exit procedure.