TDA7449 datasheet(9/17 Pages) STMICROELECTRONICS

9 / 17 page

SOFTWARE SPECIFICATION

Interface Protocol

The interface protocol comprises:

A start condition (S)

A chip address byte, containing the TDA7449

address

A subaddress bytes

A sequence of data (N byte + acknowledge)

A stop condition (P)

ACK = Acknowledge

S = Start

P = Stop

A = Address

B = Auto Increment

10001000

ACK

DATA

ACK

MSB

LSB

MSB

LSB

MSB

LSB

CHIP ADDRESS

D96AU420

DATA

SUBADDRESS

DATA 1 to DATA n

XXB

EXAMPLES

No Incremental Bus

The TDA7449 receives a start condition, the cor-

rect chip address, a subaddress with the B = 0

(no incremental bus), N-data (all these data con-

cern the subaddress selected), a stop condition.

10001000

ACK

DATA

ACK

MSB

LSB

MSB

LSB

MSB

LSB

CHIP ADDRESS

D96AU421

XD3

SUBADDRESS

DATA

D2 D1 D0

Incremental Bus

The TDA7449 receive a start conditions, the cor-

rect chip address, a subaddress with the B = 1

(incremental bus): now it is in a loop condition

with an autoincrease of the subaddress whereas

SUBADDRESS from ”XXX1000” to ”XXX1111” of

DATA are ignored.

The DATA 1 concern the subaddress sent, and

the DATA 2 concern the subaddress sent plus

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

stop condition.

10001000

ACK

DATA

ACK

MSB

LSB

MSB

LSB

MSB

LSB

CHIP ADDRESS

D96AU422

XD3

SUBADDRESS

DATA 1 to DATA n

D2 D1 D0

TDA7449

9/17

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