GC864 Hardware User Guide
1vv0300874 Rev.1 – 2010-03-29
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved.
Page 34 of 64
7.1.
Reset Signal
Signal
Function
I/O
PIN Number
RESET
Reset
I
54
RESET is used to reset the GC864-QUAD V2 / GC864-DUAL V2 modules. Whenever
this signal is pulled low, the GC864-QUAD V2 / GC864-DUAL V2 is reset. When the
device is reset it stops any operation. After the release of the reset GC864-QUAD V2 /
GC864-DUAL V2 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 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 the GC864-QUAD V2 / GC864-DUAL V2. 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, to permit to the internal circuitry the
power on reset and under voltage lockout functions.
