Examples

TDA7449

12/21

DocID006317 Rev 5

6

Examples

6.1

No incremental bus

The TDA7449 receives a start condition, the correct chip address, a subaddress with B = 0

(no incremental bus), N-data (all these data concern the subaddress selected), a stop

condition.

Figure 14. No incremental bus (B = 0)

6.2

Incremental bus

The TDA7449 receives a start condition, the correct chip address, a subaddress with 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.

DATA 1 concern the subaddress sent, and DATA 2 concerns the subaddress sent plus one

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

Figure 15. Incremental bus (B=1)

Table 6. Power-on reset condition

S

1

0

0

0

1

0

0

0

ACK

ACK

DATA

ACK

P

MSB

LSB

MSB

LSB

MSB

LSB

CHIP ADDRESS

D96AU421

X

D3

SUBADDRESS

DATA

X

X

0

D2 D1 D0

Input selection

IN2

Input gain

28 dB

Volume

Mute

Bass

0 dB

Treble

2 dB

Speaker

Mute

S

1

0

0

0

1

0

0

0

ACK

ACK

DATA

ACK

P

MSB

LSB

MSB

LSB

MSB

LSB

CHIP ADDRESS

D96AU422

X

D3

SUBADDRESS

DATA 1 to DATA n

X

X

1

D2 D1 D0

Obsolete

Product(s)

- Obsolete

Product(s)