User's Manual

GE864
GE864GE864
GE864-
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-QUAD Automotive V2 Hardware User Guide
QUAD Automotive V2 Hardware User GuideQUAD Automotive V2 Hardware User Guide
QUAD Automotive V2 Hardware User Guide
1vv0300840 Rev.3 2010-04-08
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 35 of 71
8.1.
8.1.8.1.
8.1. Reset signal
Reset signalReset signal
Reset signal
Signal
SignalSignal
Signal Function
FunctionFunction
Function I/O
I/OI/O
I/O Bga Ball
Bga BallBga Ball
Bga Ball
RESET Phone reset I A2
RESET is used to reset the GE864
GE864GE864
GE864-
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-QUAD Automotive V2
QUAD Automotive V2QUAD Automotive V2
QUAD Automotive V2 modules
modules modules
modules. Whenever this
signal is pulled low, the GE864-QUAD Automotive V2 is reset. When the device is reset
it stops any operation. After the release of the reset GE864-QUAD Automotive V2 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
NOTENOTE
NOTE:
do not use this signal to power off the GE864
GE864GE864
GE864-
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-QUAD Automotive V2
QUAD Automotive V2QUAD Automotive V2
QUAD Automotive V2. Use the ON/OFF
signal to perform this function or the AT#SHDN command.
Reset Signal Operating levels
Reset Signal Operating levelsReset Signal Operating levels
Reset Signal Operating levels:
Signal
SignalSignal
Signal Min
MinMin
Min Max
MaxMax
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
must always be must always be
must always be
connected with an open collector transistor
connected with an open collector transistorconnected with an open collector transistor
connected with an open collector transistor, to permit to the internal circuitry the
power on reset and under voltage lockout functions.