User's Manual

GE/GC864-QUAD V2 and GE864-GPS Hardware User Guide
1vv0300915 Rev.2 – 2011-06-15
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights
Reserved. Page 56 of 97
8.1. Reset Signal
Signal
Function
I/O
Ball
/Pin
Number
RESET Reset I A2 on GE864-QUAD
V2/GPS
54 on GC864-QUAD V2
RESET is used to reset the GE/GC864-QUAD V2 and GE864-GPS
modules. Whenever this signal is pulled low, the GE/GC864-QUAD
V2 and GE864-GPS are reset. When the device is reset it stops
any operation. After the release of the reset GE/GC864-QUAD V2
and GE864-GPS are 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 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 is 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 GC/GE864-QUAD V2 and
GE864-GPS . Use the ON/OFF signal to perform this function or
the AT#SHDN command.
Reset Signal Operating Levels:
Signal
Min
Max
RESET Input
high
2.0V* 2.2V
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,