User's Manual

GE865 Hardware User Guide

1vv0300799 Rev.11 – 13-07-2010

11.5 Using the RFTXMON Output GPIO5

The GPIO5 pin, when configured as RFTXMON Output, is controlled by the GE865

module and will rise when the transmitter is active and fall after the transmitter activity

is completed.

There are 2 different modes for this function:

1) Active during all the calls:

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.

11.6 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.