User's Manual

UE910 3G HARDWARE USER GUIDE 1vv0301171 Rev.3 • 2015-04-17 34 of 78

5.3 Power off

Turning off the device can be done in two ways:

 via AT command (see UE910 Software User Guide, AT#SHDN)

 by tying low pin ON_OFF*

Either ways, the device issues a detach request to network informing that the device will not be

reachable any more.

To turn OFF the UE910 the pad ON_OFF* must be tied low for at least 3 seconds and then released.

NOTE:

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

must be monitored. The device is powered off when PWRMON goes low.

In order to avoid a back powering effect it is recommended to avoid having any

HIGH logic level signal applied to the digital pins of the UE910 when the

module is powered off or during an ON/OFF transition.