User's Guide

LE910Cx HW User Guide
Doc#: 1VV0301298
Rev. 13.0 Page 49 of 124 2019-07-15
NOTE:
Do not use any pull-up resistor on the HW_SHUTDOWN_N line or any totem
pole digital output. Using a pull-up resistor may cause latch-up problems on
the LE910Cx power regulator and improper functioning of the module. The
HW_SHUTDOWN_N line must be connected only in an open-collector
configuration.
NOTE:
The Unconditional Hardware Shutdown must always be implemented on the
boards, but the software must use it only as an emergency exit procedure,
and not as a normal power-off operation.
Powering OFF the Module
Powering OFF the module should be done gracefully allowing the module to complete all
ongoing and pending tasks while properly handling all memory buffers.
In the case where a complete power supply shut down is needed, the following procedure
should be followed:
1. Perform a HW shutdown as described in Section 5.3.1
2. Wait for the HW Shutdown procedure to complete (monitor the PWRMON pin).
3. Turn OFF power supply to the module
WARNING:
Follow the recommended procedure for shut down and power off carefully.
Not following the recommended shut-down and power off procedures might
damage the device and consequently void the warranty.