GE863-PRO3 Hardware User Guide
1vv0300773a Rev. 0 - 24/01/08
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 38 of 64
Signal Function I/O Bga Ball
RESET*-GSM Phone reset I E5
RESET*-GSM is used to reset the GE863-PRO3 modules GSM/GPRS engine. Whenever this signal is pulled
low, the GSM/GPRS engine is reset. When the device is reset it stops any operation. After the release
of the reset the GSM/GPRS engine 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*-GSM 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-PRO3 GSM/GPRS engine. Use the ON/OFF*-GSM
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.