User's Manual

CE910 Family Hardware User Guide
1vv0301010 Rev.11 – 2015-10-27
Reproduction forbidden without written authorization from Telit Communications S.p.A. - All Rights Reserved.
Page 24 of 75
4.2. Turning off the CE910 module
Turning off the device can be done in two ways:
 via AT command (see CE910 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 CE910 the pad ON_OFF* must be tied low for at least 2.5 seconds and then released.
TIP:
To check if the device has powered off, hardware line PWRMON must be monitored.
The device is powered off when PWRMON goes low.
NOTE:
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 CE910 when the module is powered OFF or during an
ON/OFF transition.
4.2.1. Turning OFF by AT Command
The CE910 can be shut down by a software command.
When a shutdown command is sent, the CE910 goes into the finalization state and will shut down
PWRMON at the end of this state. The period of the finalization state can vary according to the state
of the CE910 so it cannot be fixed definitely.
Normally it will be 10 seconds after sending a shutdown command and DTE should monitor the status
of PWRMON to see the actual power off.