LE940B6 HW User Guide
Rev. 2.02
Page 53 of 111
2020-01-10
5.3.2.
Hardware Shutdown
To turn off the LE940B6 module, the ON_OFF_N pad must be asserted low in the range
of 1150 - 1250 milliseconds and then released. Use the same circuitry and timing for
power-on.
When the ON_OFF_N is asserted low for a period in the range 1150 - 1250 milliseconds
and then released, LE940B6 goes into the Finalization state and in the end shuts down
VAUX/PWRMON.
The duration of the Finalization state can differ according to the current situation of the
module, so a value cannot be defined.
Usually, it will take more than 10 seconds from sending a shutdown command until
reaching a complete shutdown. The DTE host should monitor the status of
VAUX/PWRMON to observe the actual power-off.
Figure 8: Hardware Shutdown
NOTE:
To check whether the device has powered off, monitor the VAUX/PWRMON
hardware line. When VAUX/PWRMON goes low, the device has powered
off.
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