Technical data

SYSTEM CONNECTOR INTERFACE

LZT 123 8020 R1A

Parameter Min. Typ. Max. Units

Pull-up resistance (at 2.75 V) 100 kΩ

Low Level Input voltage (SIM inserted) 0.80 V

High Level Input voltage (SIM missing) > 1.93 2.75 V

Note! To meet regulatory approvals SIMPRESENCE must be

implemented.

5.11 Service/Programming

Pin Signal Dir Description

58 SERVICE I Flash programming voltage

When the SERVICE input signal is active the radio device will:

• be reprogrammed if data is received through UART2 from a

computer running Sony Ericsson reprogramming software;

• or it will output logging data on UART2.

The electrical characteristics are given below. The signal

reference is DGND.

SERVICE Voltage (V) Mode

Min. Typ. Max.

Drive Capacity

Normal Operation 0.8 -

Service/enable programming 1.9 2.75V 3.6 > 1 mA

Absolute maximum voltage 13.5

5.12 Buzzer

Pin Signal Dir Description

31 BUZZER O Buzzer output from radio device

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

Pin Signal Dir Description

33 LED O LED Output from radio device