User Manual

GE863-PRO
3
Hardware User Guide
1vv0300773a Rev. 1 DRAFT - 24/04/08
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 21 of 82
4.2 Turning OFF the GE863-PRO
3
GSM Engine
The turning off of the device can be done in two ways:
• by software command (see GE863- GE863-PRO
3
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.
4.2.1 Hardware shutdown
To turn OFF the GE863-PRO
3
the pad ON_OFF*-GSM 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_OFF*-GSM 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.
4.3 Hardware Unconditional Reboot of GSM Engine
To unconditionally Reboot the GE863-PRO3 , the pad RESET*-GSM must be tied low for at least 200
milliseconds and then released.
The maximum current that can be drained from the RESET*-GSM pad is 0,15 mA.
A simple circuit to do it is:
RESET*-GSM
Unconditional Reboot
impulse
GND