GL865-DUAL V3 Hardware User Guide
1vv0301018 Rev.5 – 2013-08-05
Reproduction forbidden without written authorization from Telit Communications S.p.A. - All Rights Reserved.
Page 53 of 76
Mod. 0805 2011-07 Rev.2
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 GL865-DUAL V3
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.
11.7.
Using the Buzzer Output GPIO7
The GPIO7 pad, when configured as Buzzer Output, is controlled by the GL865-DUAL V3
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:
TR1
BCR141W
TR2
SMBT2907A
R1
4,7K
R2
1K
D1
D1N4148
C1
33pF
+
-
+V buzzer
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
.