SOFTWARE SPECIFICATION

Interface Protocol

The interface protocol comprises:

A start condition (S)

A chip address byte

A subaddress bytes

A sequence of data (N byte + achnowledge)

A stop condition (P)

CHIP ADDRESS

SUBADDRESS

DATA 1 to DATA n

MSB

LSB

MSB

LSB

MSB

LSB

S

100000

A

0 ACK B

DATA

ACK

DATA

ACK P

ACK = Achnowledge

S = Start

P = Stop

B = Auto Increment

EXAMPLES

No Incremental Bus

The TDA7467 receives a start condition, the correct chip address, a subaddress with the MSB = 0 (no in-

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

Incremental Bus

The TDA7467 receives a start condition, the correct chip address, a subaddress with the MSB = 1 (incre-

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

DRESS from ”1XXXX1XX” to ”1XXX1111” of DATA are ignored.

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

the loop etc. and at the end, it receives the stop condition.

CHIP ADDRESS

SUBADDRESS

DATA

MSB

LSB

MSB

LSB

MSB

LSB

S

1

0

0

0

0

0

A

0 ACK 0

X

X

X

X

X D1 D0 ACK

DATA

ACK P

CHIP ADDRESS

SUBADDRESS

DATA 1 to DATA n

MSB

LSB

MSB

LSB

MSB

LSB

S

1

0

0

0

0

0

A

0 ACK 1

X

X

X

X

X D1 D0 ACK

DATA

ACK P

TDA7467

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