User's Manual

UE866 HARDWARE USER GUIDE 1vv0301157 Rev.7 • 2015-04-17 32 of 68
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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
UE866 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.
Modem RESET
Proc.
RESET* = LOW
Delay = 200ms
Start At CMD
RESET* = HIGH
Delay = 1s