LN920 HW Design Guide
1VV0301730 Rev. 1
Page 41 of 81
2021-08-11
Not Subject to NDA
RESET
Device reset can be triggered by Unconditional reset using the RESET#.
6.4.1.
Unconditional Hardware Reset
To unconditionally restart the LN920 module, the RESET# pin must be asserted LOW for
more than
1
second, then released.
As shown in the diagram below,
Boot OK/ Shutdown Indicator
*
pin
will indicate module
status.
When the status transitions High to Low, the module has completed power off procedure.
When the status transitions Low to High, the module has completed power on procedure.
*
Boot OK/ 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 Boot OK/
Shutdown Indicator pin. After enabling the function, the corresponding pin operates as a
Boot OK and Shutdown Indicator function. Refer to the AT Reference guide document for
more details about AT#SHDNIND.
Note:
Unconditional Hardware Reset must be used only as an
emergency procedure, not as a normal power-off operation.
