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TDA7443D

SOFTWARE SPECIFICATION

Interface Protocol

The interface protocol comprises:

s

A start condition (S)

s

A chip address byte, containing the TDA7440D address

s

A subaddress bytes

s

A sequence of data (N byte + acknowledge)

s

A stop condition (P)

ACK = Acknowledge;

S = Start;

P = Stop;

A = Address;

B = Auto Increment

EXAMPLES

No Incremental Bus

The TDA7443D receives a start condition, the correct chip address, a subaddress with the B = 0 (no incremental

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

Incremental Bus

The TDA7443D receivea start conditions, the correct 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 con-

cern the subaddress sent plus one in the loop etc, and at the end it receivers the stop condition.

S

1

0

0

0

1

0

0

0

ACK

ACK

DATA

ACK

P

MSB

LSB

MSB

LSB

MSB

LSB

CHIP ADDRESS

D96AU420

X

DATA

SUBADDRESS

DATA 1 to DATA n

XXB

S

1

0

0

0

1

0

0

0

ACK

ACK

DATA

ACK

P

MSB

LSB

MSB

LSB

MSB

LSB

CHIP ADDRESS

D96AU421

XD3

SUBADDRESS

DATA

XX

0

D2 D1 D0

S

1

0

0

0

1

0

0

0

ACK

ACK

DATA

ACK

P

MSB

LSB

MSB

LSB

MSB

LSB

CHIP ADDRESS

D96AU422

XD3

SUBADDRESS

DATA 1 to DATA n

XX

1

D2 D1 D0