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 52 of 64
The GSM/GPRS engine GPIO pads, when configured as Alarm Output, can be controlled by the
GE863-PRO3 module and will rise when the alarm starts and fall after the issue of a dedicated AT
command.
This output can be used to power up the GE863-PRO3 application processor at the alarm time, giving
you the possibility to program a timely system wake-up to achieve some periodic actions and
completely turn off both the application processor and the GE863-PRO3 during sleep periods,
dramatically reducing the sleep consumption to few μA.
In battery-powered devices this feature will greatly improve the autonomy of the device.
The GPIO4 pad, when configured as Buzzer Output, is controlled by the GE863-PRO3 module and will
drive with appropriate square waves a Buzzer driver.
This permits to your application to easily implement Buzzer feature with ringing tones or melody
played at the call incoming, tone playing on SMS incoming or simply playing a tone or melody when
needed by your application.
A sample interface scheme is included below to give you an idea of how to interface a Buzzer to the
GPIO7:
NOTE: To correctly drive a buzzer a driver must be provided, its characteristics depend on the Buzzer and for them
refer to your buzzer vendor.