User's Guide

LE910 V2 HARDWARE USER GUIDE 1VV0301200 Rev.8 • 2016-10-07 41 of 84

5.5 Fast power down

The procedure to power off LE910 V2 described in Chapter 5.3 normally takes more than 1 second to detach from

network and make LE910 V2 internal filesystem properly closed.

In case of unwanted supply voltage loss the system can be switched off without any risk of filesystem data corruption

by implementing Fast Shut Down feature.

Fast Shut Down feature permits to reduce the current consumption and the time-to-poweroff to minimum values.

NOTE:

Refer to LE910 V2 series AT command reference guide (Fast power down -

#FASTSHDN) in order to set up detailed AT command.

5.5.1 Fast Shut Down by Hardware

The Fast Power Down can be triggered by configuration of any GPIO. HI level to LOW level transition of GPIO

commands fast power down.

Example circuit:

NOTE:

In case of power on with slow ramp-up of Vbatt supply voltage while ON/OFF* is tied to

GND (case possibile if timing are not properly controlled), HW_SHUTDOWN* line has to

be used according to power on diagram in chapter 5.2.