User's Manual

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