LM940 Hardware Design Guide
1VV0301352 Rev. 18 Page 36 of 75 2022-01-04
Once the shutdown command is sent, the LM940 module enters finalization state,
terminates active processes, and prepares to turn off safely.
As shown in below figure, when the module is ready to be turned off, it will be indicated
via Shutdown Indicator.
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.
Figure 5: Graceful Shutdown by AT Command
The DTE should monitor the status of Shutdown Indicator to proceed graceful power-off.
Note: VBATT must not be removed before Shutdown Indicator goes
LOW.
Warning: Not following the recommended shut-down procedures
might damage the device and consequently void the warranty.
6.3.2. Fast Shutdown
For a quicker shutdown of the LM940 module, the host can use the fast shutdown
function. Fast shutdown can be triggered by:
• AT command via USB
• GPIO
6.3.2.1. Fast Shutdown by AT Command
Once AT#FASTSHDN command is sent through the USB port, the LM960 enters
finalization state, terminates active processes and preparing to safely turn off.
As shown in the diagram below, when the module is ready to be turned off, it will be
indicated via Shutdown Indicator.
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