User's Manual
LE920 Hardware User Guide
1vv0301026 Rev.8 2015-01-03
Reproduction forbidden without written authorization from Telit Communications S.p.A. - All Rights
Reserved. Page 32 of 88
4.3.2. Hardware Shutdown
To turn OFF LE920 the pad ON/OFF# must be tied low for at least 2 seconds and then
released. The same circuitry and timing for the power on must be used.
When the hold time of ON/OFF# is above 2.5 seconds, LE920 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 LE920 is,
so it cannot be fixed definitely.
. Normally it will be more than15 seconds after sending a shutdown command ; DTE should
monitor the status of PWRMON to see observe the actual power off.
TIP:
To check if the device has powered off, hardware line PWRMON must be monitored. When
PWRMON goes low, the device has powered off.