ST7FDALIF2M6 datasheet(70/141 Pages) STMICROELECTRONICS

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ST7DALI

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11.4 DALI COMMUNICATION MODULE

11.4.1 Introduction

The DALI Communication Module (DCM) is a seri-

al communication circuit designed for controllable

electronic ballasts. Ballasts are the devices used

to provide the required starting voltage and operat-

ing current for fluorescent, mercury, or other elec-

tric-discharge lamps. The DCM supports the DALI

(Digital Addressable Lighting Interface) communi-

cations standard (IEC standard).

11.4.2 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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