User's Manual

HE910 Hardware User Guide
1vv0300925 Rev.9 – 07-02-2012
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4.3 HE910 Unconditional Shutdown
The Unconditional Shutdown of the module could be activated using the RESET* 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 RESET* must be tied low for at
least 200 milliseconds and then released.
NOTE:
Do not use any pull up resistor on the RESET* 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 RESET* must be connected only in
open collector configuration.
The RESET* is generating an unconditional shutdown of the module without an
automatic restart.
TIP:
The unconditional hardware shutdown must always be implemented on the boards and
should be used only as an emergency exit procedure.