Sony Ericsson GR47/GR48 - Manual (Page 42)

5. SYSTEM CONNECTOR INTERFACE
42
LZT 123 7589 R1A
The electrical characteristics are given below. The signal reference is
DGND.
5.12 Buzzer
Connecting the BUZZER signal to an inverting transistor-buffer followed
by a piezoelectric transducer enables the radio device to play pre-
programmed melodies or sounds.
5.13 LED
The LED states shown below, are hard coded.
Mode SERVICE Voltage (V) Drive Capacity
Min. Typ. Max.
Normal Operation 0.8 -
Service/enable
programming
1.9 2.75V 3.6 > 1 mA
Absolute maximum
voltage
13.5
Pin Signal Dir Description
31 BUZZER O Buzzer output from radio device
Pin Signal Dir Description
33 LED O LED Output from radio device
LED indication Operational status
No indication No power or in the OFF state
Green, steady Power on, not connected to a network
Green, blinking Power on, connected to a network