User's Manual

GC864 Hardware User Guide

1vv0300733 Rev. 0 - 12/06/06

10.3 Using the Alarm Output GPIO_06/ALARM

The GPIO_06/ALARM pad, when configured as Alarm Output, is controlled by the GC864 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 GC864 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 GC864 during sleep periods, drammatically

reducing the sleep comsumption to few μA.

In battery powered devices this feature will greatly improve the autonomy of the device.

10.4 Using the Buzzer Output GPIO_07/BUZZER

The GPIO_07/BUZZER pad, when configured as Buzzer Output, is controlled by the GC864 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

GPIO_07/BUZZER.

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.