Specifications

Telit GM862-PCS/-GPRS/-GSM Product Description

1vv0300604, Rev. ISSUE#14 - 22/01/04

Operating Range - Interface levels (2.8V CMOS)

Level Min Max

Input high level 2.1V 3.3V

Input low level 0V 0.5V

Output high level 2.2V 3.0V

Output low level 0V 0.35V

For 2,0V signals:

Operating Range - Interface levels (2.0V CMOS)

Level Min Max

Input high level 1.6V 3.3V

Input low level 0V 0.4V

Output high level 1,65V 2.2V

Output low level 0V 0.35V

2.13.1 Reset signal

Signal Function I/O Pin

RESET Phone reset I/O 23 (connector SO301)

RESET is used to reset the Telit GM862-GPRS module. Whenever this signal is pulled low, the

GM862-GPRS is reset. When the device is reset it stops any operation and after the release of the

reset it shuts down, without doing any detach operation from the network where it is registered to.

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 stucked 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 Telit GM862-GPRS module. Use the ON/OFF

signal (Pin 17 of SO301) to perform this function or the AT#SHDN command.