TDA7439

13/23

5

5.1

No address incrementing

The TDA7439 receives a start condition followed by the correct chip address, then a sub

address with the bit B = 0 (for no address increment), then the data bytes to be sent to the

sub address and finally a stop condition.

Figure 16.

SDA addressing and data for B = 0

5.2

Address incrementing

The TDA7439 receives a start condition followed by the correct chip address, then a sub

address with the B = 1 for address incrementing; now it is in a loop condition with an

automatic increase of the sub address up to D[3:0] = 0x7. That is, the data for sub

addresses from D[3:0] = 1000 (binary) to 1111 are ignored.

In Figure 17 below, DATA1 is directed to the sub address sent (that is, D[3:0]), DATA2 is

directed to the sub address incremented by 1 (that is, 1 + D[3:0]) and so forth until a stop

condition is received to terminate the transmission.

Figure 17.

SDA addressing and data for B = 1

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

Table 6.

Power-on-reset conditions

Parameter

POR value

Input selection

IN2

Input gain

28 dB

Volume

MUTE

Bass

0 dB

Mid-range

2 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