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TDA7429L

2.0 SOFTWARE SPECIFICATION

2.1 Interface Protocol

The interface protocol comprises:

s

A start condition (S)

s

A chip address byte, containing the TDA7429L address

s

A subaddress bytes

s

A sequence of data (N byte + achnowledge)

s

A stop condition (P)

3.0 EXAMPLES

3.1 No Incremental Bus

The TDA7429L receives a start condition, the correct chip address, a subaddress with the MSB = 0 (no incre-

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

3.2 Incremental Bus

The TDA7429L receives a start condition, the correct 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 concern thesubaddress sent, and the DATA 2

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

SCL

1

MSB

237

89

SDA

START

ACKNOWLEDGMENT

FROM RECEIVER

D99AU1033

ACK = Acknowledge

S = Start

P = Stop

A = Address

B = Auto Increment

S

1

0

0

0

0

0

A

0

ACK

ACK

DATA

ACK

P

MSB

LSB

MSB

LSB

MSB

LSB

CHIP ADDRESS

D95AU226A

B

DATA

SUBADDRESS

DATA 1 to DATA n

S

1

0

0

0

0

0

A

0

ACK

ACK

DATA

ACK

P

MSB

LSB

MSB

LSB

MSB

LSB

CHIP ADDRESS

D95AU306

0D3

SUBADDRESS

DATA

XX

X

D2 D1 D0

S

1

0

0

0

0

0

A

0

ACK

ACK

DATA

ACK

P

MSB

LSB

MSB

LSB

MSB

LSB

CHIP ADDRESS

D95AU307

1D3

SUBADDRESS

DATA 1 to DATA n

XX

X

D2 D1 D0