User's Manual

LE910 Hardware User Guide
1vv0301089 Rev.3 – 09-06-2014
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 21 of 79
Turning off of the device can be done in two ways:
 via AT command (see LE910 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.
LE910 can be shut down using the AT#SHDN command.
When a shutdown command is sent, LE910 goes into the finalization state and finally will shut
down PWRMON at the end of this state.
The period of the finalization state can differ according to the situation in which the LE910 is so
it cannot be fixed definitely.
Normally it will be above 15 seconds later from sending a shutdown command and DTE should
monitor the status of PWRMON to see the actual power off.
TIP:
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.
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 LE910 when the module is powered off or during
an ON/OFF transition.