User Guide

LM960 HW Design Guide
1VV0301485 Rev. 15 Page 45 of 88 2020-08-13
 Unconditional Shutdown using the SYSTEM_RESET_N
6.3.1. Graceful Shutdown
To shutdown the LM960 module safely, host can use the graceful shutdown function.
The graceful shutdown can be triggered by:
 AT command via USB
6.3.1.1. Graceful Shutdown by AT command
To gracefully shutdown the LM960 module, AT#SHDN command must be sent via a USB
communication.
Once the shutdown command is sent, the LM960 module enters finalization state,
terminates active processes and prepares to turn off safely.
As shown in the diagram below, Shutdown indicator will indicate when the module is
ready to be turned off.
Please refer to the AT User Guide for more detail about AT#SHDN and AT#SHDNIND.
Graceful Shutdown by AT Command
The DTE should monitor the status of Shutdown Indicator to proceed graceful power-off.
Information – VBATT must not be removed before Shutdown
Indicator goes LOW.