User's Manual

GC864 Hardware User Guide

1vv0300733 Rev. 0 - 12/06/06

2.2 Turning OFF the GC864

The turning off of the device can be done in three ways:

• by software command (see GC864 Software User Guide)

• by hardware shutdown

When the device is shut down by software command or by hardware shutdown, it issues to the

network a detach request that informs the network that the device will not be reachable any more.

2.2.1 Hardware shutdown

To turn OFF the GC864 the pad ON# must be tied low for at least 1 second and then released.

The same circuitry and timing for the power on shall be used.

The device shuts down after the release of the ON# pad.

TIP: To check if the device has powered off, the hardware line PWRCTL should be monitored.

When PWRCTL goes low, the device has powered off.

2.3 Hardware Unconditional Reboot

To unconditionally Reboot the GC864, 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: don't use any pull up resistor on the RESET# line nor any totem pole digital output.

Using pull up resistor may bring to latch up problems on the GC864 power regulator and

improper functioning of the module. The line RESET# must be connected only in open

collector configuration.

RESET#

Unconditional Reboot

impulse

GND