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TDA7449

TONE CONTROL DIGITALLY CONTROLLED AUDIO PROCESSOR

STMicroelectronics 

TDA7449

Figure 14. Acknowledge on the I2CBUS

SCL

1

2

3

7

8

9

SDA

START

MSB

D99AU1033

ACKNOWLEDGMENT

FROM RECEIVER

5 SOFTWARE SPECIFICATION

5.1 Interface Protocol

The interface protocol comprises:

■ A start condition (S)

■ A chip address byte, containing the TDA7449 address

■ A subaddress bytes

■ A sequence of data (N byte + acknowledge)

■ A stop condition (P)

Figure 15.

CHIP ADDRESS

SUBADDRESS

DATA 1 to DATA n

MSB

LSB

MSB

S 1 0 0 0 1 0 0 0 ACK X X X B

D96AU420

ACK = Acknowledge

S = Start

P = Stop

A = Address

B = Auto Increment

LSB

MSB

DATA

ACK

DATA

LSB

ACK P

6 EXAMPLES

6.1 No Incremental Bus

The TDA7449 receives a start condition, the correct chip address, a subaddress with the B = 0 (no incre-

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

Figure 16.

CHIP ADDRESS

SUBADDRESS

DATA

MSB

LSB

MSB

LSB

MSB

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

D96AU421

DATA

LSB

ACK P

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