TDA7442D データシートの表示（PDF） - STMicroelectronics

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TDA7442D

TONE CONTROL AND SURROUND DIGITALLY CONTROLLED AUDIO PROCESSOR

STMicroelectronics 

TDA7442 - TDA7442D

4 SOFTWARE SPECIFICATION

Interface Protocol

The interface protocol comprises:

■ A start condition (S)

■ A chip address byte, containing the TDA7442D

■ 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 0 0 A 0 ACK B

D95AU226A

ACK = Acknowledge

S = Start

P = Stop

A = Address

B = Auto Increment

DATA

LSB

MSB

ACK

DATA

LSB

ACK P

4.1 EXAMPLES

4.1.1 No Incremental Bus

The TDA7442D receives a start condition, the correct chip address, a subaddress with the MSB = 0 (no

incremental bus), N-datas (all these data concern the subaddress selected), a stop condition.

CHIP ADDRESS

SUBADDRESS

MSB

LSB

MSB

LSB

MSB

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

D95AU306

DATA

DATA

LSB

ACK P

4.1.2 Incremental Bus

The TDA7442D receive a start conditions, the correct chip address, a subaddress with the MSB = 1 (in-

cremental bus): now it is in a loop condition with an autoincrease of the subaddress whereas SUBAD-

DRESS from "1XXX1010" to "1XXX1111" of DATA are ignored.

The DATA 1 concern the subaddress sent, and the DATA 2 concerns the subaddress sent plus one sent

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

D95AU307

DATA

LSB

ACK P

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