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TDA7439

THREE BANDS DIGITALLY CONTROLLED AUDIO PROCESSOR

STMicroelectronics 

SOFTWARE SPECIFICATION

Interface Protocol

The interface protocol comprises:

A start condition (S)

A chip address byte, containing the TDA7439

TDA7439

address

A subaddress bytes

A sequence of data (N byte + acknowledge)

A stop condition (P)

CHIP ADDRESS

SUBADDRESS

DATA 1 to DATA n

MSB

LSB

MSB

S 1 0 0 0 1 0 0 0 ACK X X X B

D96AU420

LSB

MSB

DATA

ACK

DATA

LSB

ACK P

ACK = Acknowledge

S = Start

P = Stop

A = Address

B = Auto Increment

EXAMPLES

No Incremental Bus

The TDA7439 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.

CHIP ADDRESS

SUBADDRESS

MSB

LSB

MSB

LSB

MSB

S 1 0 0 0 1 0 0 0 ACK X X X 0 D3 D2 D1 D0 ACK

D96AU421

DATA

DATA

LSB

ACK P

Incremental Bus

The TDA7439 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.

CHIP ADDRESS

SUBADDRESS

DATA 1 to DATA n

MSB

LSB

MSB

LSB

MSB

S 1 0 0 0 1 0 0 0 ACK X X X 1 D3 D2 D1 D0 ACK

D96AU422

DATA

LSB

ACK P

9/19

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