User's Manual

GE865 Hardware User Guide

1vv0300799 Rev.6 - 04/06/09

11.6 Using the Alarm Output GPIO6

The GPIO6 pad, when configured as Alarm Output, is controlled by the GE865 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 GE865 controlling microcontroller or application at the alarm

time, giving you the possibility to program a timely system wake-up to achieve some periodic actions

and completely turn off either the application and the GE865 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.

11.7 Using the Buzzer Output GPIO7

The GPIO7 pad, when configured as Buzzer Output, is controlled by the GE865 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.