LM940 Hardware Design Guide
1VV0301352 Rev. 18 Page 39 of 75 2022-01-04
Note: To avoid a back-powering effect, it is recommended to avoid
having any HIGH logic level signal applied to the digital pins of the
module when it is powered OFF or during an ON/OFF transition.
Warning: Not following the recommended shut-down procedures
might damage the device and consequently void the warranty.
Figure 8: Shutdown by SYSTEM_RESET_N Pad
Below figure shows a simple circuit for this action.
Figure 9: Circuit for Shutdown by SYSTEM_RESET_N
Reset
Reset the device can be done in two different ways:
• Graceful Reset by USB AT command AT#REBOOT
• Unconditional Reset using the SYSTEM_RESET_N
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