User's Manual

HC864-AUTO Hardware User Guide
1vv0300946 Rev.4 – 2012-12-27
Reproduction forbidden without written authorization from Telit Communications S.p.A. - All Rights
Reserved. Page 24 of 77
4.3.2. Hardware Shutdown
To turn OFF HC864-AUTO the pad ON/OFF# must be tied low for at least 2 seconds and
then released. Same circuitry and timing for the power on must be used.
When the hold time of ON/OFF# is above 2 seconds, HC864-AUTO 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 HC864-
AUTO is so it cannot be fixed definitely.
Normally it will be above 10 seconds later from releasing ON/OFF# and DTE should monitor
the status of PWRMON to see 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.