User Guide

GE9

GE9GE9

GE910 Hardware User Guide

10 Hardware User Guide10 Hardware User Guide

10 Hardware User Guide

1vv0300962 Rev.4 2012-06-25

Mod. 0805 2011-07 Rev.2

7.1. Unconditional Shutdown

Signal Function I/O Pin

HW_SHUTDOWN* Hardware unconditional Shutdown I R13

HW_SHUTDOWN* is used to unconditionally shutdown the GE910. Whenever this signal is

pulled low, the GE910 is unconditionally shutdown. When the device is reset it stops any

operation. After the release of the HW_SHUTDOWN* pin, the GE910 is unconditionally shut

down, without doing any detach operation from the network where it is registered. This behavior

is not a proper shut down because any GSM device is requested to issue a detach request on turn

off. For this reason the unconditional shutdown pin HW_SHUTDOWN* signal must not be used

to normally shutting down the device, but only as an emergency exit in the rare case the device

remains stuck waiting for some network response.

After the unconditional shutdown pin HW_SHUTDOWN* used the module is in off status.

It may only be used to reset a device already on that is not responding to any command.

NOTE:

Do not use this signal to power off the GE910. Use the ON/OFF signal to perform this function

or the AT#SHDN command.

This signal is internally pulled up so the pin can be left floating if not used.

NOTE:

if used, then it must always be connected with an open collector transistor.