LE910Cx Hardware Design Guide
1VV0301298 Rev.40 Page 47 of 149 2023-03-16
Not Subject to NDA
5.3.1. Shutdown by Software Command
The LE910Cx module can be shut down by a software command.
When a shutdown command is sent, LE910Cx enters the Finalization state and at the end
of the finalization process shuts down PWRMON/SW_RDY .
The duration of the Finalization state may vary according to the current situation of the
module, so it is not possible to define a value.
Usually, it will take more than 10 seconds from sending a shutdown command until a
complete shutdown is achieved. The DTE host should monitor the PWRMON/SW_RDY
status to observe the actual power-off.
Figure 8: Shutdown by Software Command
Note: To check whether the device has powered off, monitor the
PWRMON/SW_RDY hardware line. When PWRMON/SW_RDY goes
low, the device has powered off.
5.3.2. Hardware Shutdown
To turn off the LE910Cx module, the ON_OFF_N pad must be asserted low for at least 2.5
seconds and then released. Use the same circuitry and timing for power-on.
When the ON/OFF# hold time is above 2.5 seconds, the LE910Cx enters the Finalization
state and eventually shuts down PWRMON/SW_RDY .
The duration of the Finalization state can differ according to the current module situation,
so a value cannot be defined.
Note:
To avoid a back-powering effect, it is recommended to
prevent any HIGH logic level signal from being applied to the
module’s digital pins when it is powered OFF or during an ON/OFF
transition.
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