User's Manual

GL865 Hardware User Guide

1vv0300910 Rev.1 – 2011-07-22

page 58 of 79

For example, if a call is started, the line will be HIGH during

all the conversation and it will be again LOW after hanged up.

The line rises up 300ms before first TX burst and will became

again LOW from 500ms to 1s after last TX burst.

2) Active during all the TX activity:

The GPIO is following the TX bursts

Please refer to the AT User interface manual for additional

information on how to enable this function.

11.5. Using the Alarm Output GPIO6

The GPIO6 pad, when configured as Alarm Output, is controlled by

the GL865 module and will rise when the alarm starts and fall

after the issue of a dedicated AT command.

This output can be used to controlling microcontroller or

application at the alarm time.

11.6. Using the Buzzer Output GPIO7

The GPIO7 pad, when configured as Buzzer Output, is controlled

by the GL865 module and will drive a Buzzer driver with

appropriate square waves.

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.

A sample interface scheme is included below to give you an idea

of how to interface a Buzzer to the GPIO7: