Rainbow Electronics GE863-PY - Manual (Page 35)

GE863 Hardware User Guide
1vv0300783 Rev.0 - 10/06/08
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 35 of 80
5.7.1 Reset signal
Signal Function I/O BGA Ball
RESET Phone reset I 47
RESET is used to reset the GE863 modules . Whenever this signal is pulled low, the GE863 is reset.
When the device is reset it stops any operation. After the release of the reset GE863-GPS is
unconditionally shut down (in case of GE863-QUAD/PY/SIM the reset line perform an unconditional
restart), 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
GE863 . 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.