User's Manual

GE865 Hardware User Guide
1vv0300799 Rev.11 – 13-07-2010
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 59 of 82
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:
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 .