User's Manual

LE910 V2 HARDWARE USER GUIDE 1VV0301200 Rev.2 Preliminary • 2015-08-04 40 of 81
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In the following flow chart is detailed the proper restart procedure:
NOTE:
Do not use any pull up resistor on the HW_SHUTDOWN* line nor any totem pole digital
output. Using pull up resistor may bring to latch up problems on the LE910 V2 power
regulator and improper functioning of the module.
To proper power on again the module please refer to the related paragraph (“Power ON”)
The unconditional hardware shutdown must always be implemented on the boards and
should be used only as an emergency exit procedure.
“HW SHUTDOWN
Unconditional”
START
HW_SHUTDOWN* = LOW
Delay = 200ms
PWRMON = ON
Disconnect
VBATT
Y
N
“HW SHUTDOWN
Unconditional”
END
HW_SHUTDOWN* = HIGH
Delay = 1s