User's Manual

GE865 Hardware User Guide

1vv0300799 Rev.6 - 04/06/09

7.1 Reset signal

Signal

Function

I/O

Bga Ball

RESET# Phone reset I A2

RESET# is used to reset the GE865-QUAD modules. Whenever this signal is pulled low, the GE865 is

reset. When the device is reset it stops any operation. After the release of the reset GE865 is

unconditionally shut down, without doing any detach operation from the network where it is registered.

This behaviour is not a proper shut down because any GSM device is requested to issue a detach

request on turn off. For this reason the Reset 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.

The RESET# is internally controlled on start-up to achieve always a proper power-on reset sequence,

so there's no need to control this pin on start-up. 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 GE865. Use the ON/OFF signal to perform this function or

the AT#SHDN command.

Reset Signal Operating levels:

Sign

Min

Max

RESET Input high 1.8V* 2.1V

RESET Input low 0V 0.2V

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

If unused, this signal may be left unconnected. If used, then it must always be connected with an

open collector transistor, to permit to the internal circuitry the power on reset and under voltage

lockout functions.