TDA7431 datasheet(10/21 Pages) STMICROELECTRONICS

10 / 21 page

SOFTWARE SPECIFICATION

Interface Protocol

The interface protocol comprises:

A start condition (S)

A chip address byte, containing the TDA7430

/TDA7431 address

A subaddress bytes

A sequence of data (N byte + achnowledge)

A stop condition (P)

ACK = Achnowledge

S = Start

P = Stop

A = Address

B = Auto Increment

100000

ACK

DATA

ACK

MSB

LSB

MSB

LSB

MSB

LSB

CHIP ADDRESS

D95AU226A

DATA

SUBADDRESS

DATA 1 to DATA n

EXAMPLES

No Incremental Bus

The TDA7430 /TDA7431 receives a start condi-

tion, the correct chip address, a subaddress with

the MSB = 0 (no incremental bus), N-datas (all

these datas concern the subaddress selected), a

stop condition.

100000

ACK

DATA

ACK

MSB

LSB

MSB

LSB

MSB

LSB

CHIP ADDRESS

D95AU306

0D3

SUBADDRESS

DATA

D2 D1 D0

Incremental Bus

The TDA7430 /TDA7431 receive s a start condi-

tion, the correct chip address, a subaddress with

the MSB = 1 (incremental bus): now it is in a loop

condition with an autoincrease of the subaddress

whereas SUBADDRESS from ”1XXX1010” to

”1XXX1111” of DATA are ignored.

The DATA 1 concern thesubaddress sent, and

the DATA 2 concern the subaddress sent plus

one in the loop etc, and at the end it receivers the

stop condition.

100000

ACK

DATA

ACK

MSB

LSB

MSB

LSB

MSB

LSB

CHIP ADDRESS

D95AU307

1D3

SUBADDRESS

DATA 1 to DATA n

D2 D1 D0

TDA7430 - TDA7431

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