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TDA7448

In Incremental Bus Mode, the three “not used” functions must be addressed in any case. For example to refresh

“ Speaker Attenuation 3 = 0dB and Speaker Attenuation 6 = -40 dB”; the following bytes must be sent:

SPEAKER ATTENUATION SELECTION

value = 0 to -79dB and MUTE

SUBADDRESS

XXX10010

SPEAKER ATTENUATION OUT 1

XXXXXXXX

SPEAKER ATTENUATION OUT 2

XXXXXXXX

SPEAKER ATTENUATION OUT 3

00000000

SPEAKER ATTENUATION OUT 4

XXXXXXXX

SPEAKER ATTENUATION OUT 5

XXXXXXXX

SPEAKER ATTENUATION OUT 6

00101111

MSB

LSB

SPEAKER ATTENUATION

D7

D6

D5

D4

D3

D2

D1

D0

00

0

0dB

0

0

1

-1dB

0

1

0

-2dB

0

1

1

-3dB

1

0

0

-4dB

1

0

1

-5dB

1

1

0

-6dB

1

1

1

-7dB

0

0

0

0

0

-0dB

0

0

0

0

1

-8dB

0

0

0

1

0

-16dB

0

0

0

1

1

-24dB

0

0

1

0

0

-32dB

0

0

1

0

1

-40dB

0

0

1

1

0

-48dB

0

0

1

1

1

-56dB

01

-64dB

10

-72dB

11

MUTE