HE910 Hardware User Guide
1VV0300925 Rev. 32 Page 37 of 111 2019-11-25
HE910 Unconditional Shutdown
The Unconditional Shutdown of the module could be activated using the
HW_SHUTDOWN* line (pad R13).
Warning
The hardware unconditional Shutdown must not be used during normal
operation of the device since it does not detach the device from the
network. It shall be kept as an emergency exit procedure
To unconditionally shutdown the HE910, the pad HW_SHUTDOWN* must be tied low for
at least 200 milliseconds and then released.
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 HE910 power regulator and improper functioning of
the module. The line HW_SHUTDOWN* must be connected only in
open collector configuration.
The HW_SHUTDOWN* is generating an unconditional shutdown of
the module without an automatic restart.
The module will shutdown, but will NOT perform the detach from the
cellular network.
To proper power on again the module please refer to the related
paragraph (“Powering ON the HE910”)
TIP:
The unconditional hardware shutdown must always be implemented
on the boards and should be used only as an emergency exit
procedure.
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