ST7DALIF2 datasheet(90/171 Pages) STMICROELECTRONICS

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DALI communication module

ST7DALIF2

90/171

DALI communication module

16.1

Introduction

The DALI Communication Module (DCM) is a serial communication circuit designed for

controllable electronic ballasts. Ballasts are the devices used to provide the required starting

voltage and operating current for fluorescent, mercury, or other electric-discharge lamps.

The DCM supports the DALI (Digital Addressable Lighting Interface) communications

standard (IEC standard).

16.2

Main features

– 8-bit forward address register for addressing up to 64 digital ballasts

– 1.2 kHz transmission rate ±10%

– 8-bit forward and backward data registers for bi-directional communications

– Maskable interrupt

Figure 41.

DALI communication module block diagram

Note:

The 4-bit preshift register is always active, except when in Halt mode or if the DCME bit = 0.

16-bit Shift Register

1/16

1/N

8-bit DCMCLK

8-bit DCMFA

8-bit DCMFD

8-bit DCMBD

DALIOUT

DALIIN

Arbitration &

Error Detection

4-bit Pre-shift

fCPU

CK0

CK1

CK2

CK3

RTF

ITF

ITE

FTS

RTS

RTA

DCME

fCPU

DCMCSR

DCMCR

DCM Interrupt Request

Edge

Detector

fDALI

4-bit sample

clock counter

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