TDA7464 datasheet(8/21 Pages) STMICROELECTRONICS

8 / 21 page

SOFTWARE SPECIFICATION

Interface Protocol

The interface protocol comprises:

A start condition (S)

A chip address byte, containing the TDA7464

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 TDA7464 receives a start condition, the cor-

rect chip address, a subaddress with the MSB = 0

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

cern 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 TDA7464 receives a start condition, the cor-

rect 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 concerns thesubaddress sent, and

the DATA 2 concerns the subaddress sent plus

one in the loop etc. and, at the end, it receives 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

TDA7464

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