Using the STK520 Top Module

STK520 User Guide

2-12

7510A–AVR–08/05

2.5

DALI Interface

STK520 includes a non-isolated DALI Interface. The DALI Interface converts AVR RxD

and TxD pin level to DALI compatible electrical level. It acts as a duplexer, so it inter-

faces the two RxD and TxD lines to one DALI line.

To use the DALI Interface, it is necessary to mount TxD and RxD jumpers. When these

jumpers are removed, the AVR is not inflenced by the interface. The TxD and RxD AVR

pins are also available on STK500 PD3 and PD4 connectors.

Thanks to a diode bridge, the DALI connector is not polarized.

Figure 2-8. DALI

Figure 2-9. DALI Connector

AVR

TxD

RxD

DALI Transmitter

DALI Receiver

JP4

JP5

PD4 PD3

DALI Line

Bridge

Rectifier

J3

RX Led &

Test Point

TX Led &

Test Point