User's Guide

LE910 V2 HARDWARE USER GUIDE 1VV0301200 Rev.8 • 2016-10-07 42 of 84
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NOTE:
Consider voltage drop under max current conditions when defining the voltage detector
thereshold in order to avoid unwanted shutdown.
Tipical timings are reported in the plot above when testing the example circuit with Ctank=47mF.
The capacitor is rated with the following formula:
where 80mA is a typical current during fast shut down procedure, 300ms is the typical time to execute the shutdown
and 0.5V is the minimum voltage marging from threshold of LE910 V2 hardware reset.
TIP:
Make the same plot during system verification to check timings and voltage levels.
5.5.2 Fast Shut Down by Software
The Fast Power Down can be triggered by AT command.