TDA7348

Software specification

13/20

4.3

Transmitted data

ZM = Zero crossing muted (HIGH active)

SM = Soft mute activated (HIGH active)

X = Not used

The transmitted data is automatically updated after each ACK.

Transmission can be repeated without new chip address.

4.4

Data byte specification

X = not relevant; set to "1" during testing

For example to select the IN 2 input with a gain of 7.5dB the Data Byte is: X X 1 0 1 0 0 1

Table 6.

Send mode

MSB

LSB

X

X

X

X

X

SM

ZM

X

Table 7.

Input Selector

MSB

LSB

Function

D7

D6

D5

D4

D3

D2

D1

D0

X

X

1

0

0

0

not used

X

X

1

0

0

1

IN 2

X

X

1

0

1

0

IN 1

X

X

1

0

1

1

AM mono

X

X

1

1

0

0

not used

X

X

1

1

0

1

IN 3

X

X

1

1

1

0

not allowed

X

X

1

1

1

1

not allowed

X

X

1

0

0

11.25dB gain

X

X

1

0

1

7.5dB gain

X

X

1

1

0

3.75dB gain

X

X

1

1

1

0dB gain

Table 8.

Loudness

MSB

LSB

Function

D7

D6

D5

D4

D3

D2

D1

D0

X

X

X

1

0

0

0

0

0dB

X

X

X

1

0

0

0

1

-1.25dB

X

X

X

1

0

0

1

0

-2.5dB