LN920 HW Design Guide
1VV0301730 Rev. 1
Page 38 of 81
2021-08-11
Not Subject to NDA
*
Boot OK (Shutdown indicator) is an optional function and is disabled by default.
Host can use the AT#SHDNIND command to assign one of the GPIOs as the Boot OK
pin. After enabling the function, the corresponding pin operates as a Book OK and also
Shutdown Indicator function. Please refer to the Power Off chatper for more
information regarding Shutdown indicator.
Please refer to the AT Reference guide document for more details about AT#SHDNIND
command.
Note: To avoid back-powering effect, it is recommended to avoid
applying HIGH logic level signals applied to the module digital pins
when it is powered OFF or during an ON/OFF transition.
Power Off
Turning off of the device can be performed in two ways:
•
Graceful shutdown by means of FULL_CARD_POWER_OFF# line
•
Fast Shutdown by GPIO triggered
Warning: Not following the recommended shut-down procedures
might damage the device and consequently void the warranty.
