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Using the STK520 Top Module
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
JP5
TX Led &
Test Point
DALI Transmitter
TxD
Bridge
Rectifier
J3
DALI Line
AVR
JP4
RX Led &
Test Point
RxD
DALI Receiver
PD4 PD3
Figure 2-9. DALI Connector
STK520 User Guide
2-12
7510A–AVR–08/05
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