TDA7403 datasheet(17/25 Pages) STMICROELECTRONICS

17 / 25 page

2C BUS INTERFACE DESCRIPTION

Interface Protocol

The interface protocol comprises:

-a start condition (S)

-a chip address byte (the LSB bit determines read

/ write transmission)

-a subaddress byte

-a sequence of data (N-bytes + acknowledge)

-a stop condition (P)

D97AU627

0 R/W ACK

ACK

MSB

LSB

MSB

LSB

MSB

LSB

CHIP ADDRESS

SUBADDRESS

DATA 1 to DATA n

AZ T

A3 A2 A1 A0

DATA

S = Start

ACK = Acknowledge

AZ = AutoZero-Remain

T = Testing

I = Autoincrement

P = Stop

MAX CLOCK SPEED 500kbits/s

The transmitted data is automatically updated af-

ter each ACK.

Transmission can be repeated without new chip

address.

Auto increment

If bit I in the subaddress byte is set to "1", the

autoincrement of the subaddress is enabled.

TRANSMITTED DATA (send mode)

MSB

LSB

SM = Soft mute activated

ST = Stereo

X = Not Used

SUBADDRESS (receive mode)

MSB

LSB

FUNCTION

A3A2A1A0

Not allowed

Auto-Zero

Volume

Softmute

Bass / Treble Attenuator

Bass / Treble Configuration

Speaker attenuator LF

Speaker attenuator LR

Speaker attenuator RF

Speaker attenuator RR / Blanktime adjust

Stereodecoder

Noiseblanker

Fieldstrength Control

Configuration

Stereodecoder Adjustment

Testing

T = Testmode

I = Autoincrement

AZ = Auto Zero Remain

X = not used

TDA7403

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