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GE864 Hardware User Guide
1vv0300694 Rev.10 - 10/06/08
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 17 of 69
4.2 Turning OFF the GE864-QUAD / PY
The turning off of the device can be done in three ways:
• by software command (see GE864-QUAD / PY Software User Guide)
• by hardware shutdown
• by Hardware Unconditional Restart
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.
4.2.1 Hardware shutdown
To turn OFF the GE864-QUAD / PY the pad ON# must be tied low for at least 2 seconds 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 PWRMON should be monitored. When PWRMON goes
low, the device has powered off.
4.2.2 Hardware Unconditional Restart
To unconditionally Restart the GE864-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:
RESET#
Unconditional Restart
impulse
GND