LN920 HW Design Guide
1VV0301730 Rev. 1
Page 40 of 81
2021-08-11
Not Subject to NDA
When the status transitions to Low, the module is ready to shutdown.
*
Shutdown Indicator (Boot OK) is optional function and is disabled by default.
Host can use the AT#SHDNIND command to assign one of the GPIOs as the Shutdown
Indicator pin. After enabling the function, the corresponding pin operates as a Shutdown
Indicator and also Boot OK function. About Boot OK, please refer to the Power On
chatper.
Refer to the AT Reference guide document for more details about AT#SHDNIND.
**
Fast Shutdown is optional function and is disabled by default.
Host can use the AT#FASTSHDN command to assign one of the GPIOs as the Fast
Shutdown Trigger pin. After enabling the function, Fast shutdown will be triggered by
HIGH to LOW transition through corresponding pin.
Refer to the AT Reference guide document for more details about and AT#FASTSHDN.
Fast shutdown by GPIO
Warning: If VPH_PWR is still supplied after Fast Shutdown is
completed, the module will re-start Power On procedure. Because
the Power On is triggered again by FULL_CARD_POWER_OFF_N.
To avoid this, enable the Shutdown indicator function.
