User Guide

HE910 Hardware User Guide
1vv0300925 Rev.18 – 15-06-2012
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The Unconditional Restart of the module could be activated using the
RESET* line (pad P11).
WARNING:
The hardware unconditional Restart 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 Restart 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 module will Restart and will NOT perform the detach from the cellular network.
TIP:
The unconditional hardware Restart should be implemented on the boards and should be used
only as an emergency exit procedure.