TDA7448 데이터 시트보기 (PDF) - STMicroelectronics

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TDA7448

6 CHANNEL VOLUME CONTROLLER

STMicroelectronics 

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:

Table 7.

SUBADDRESS

SPEAKER ATTENUATION OUT 1

SPEAKER ATTENUATION OUT 2

SPEAKER ATTENUATION OUT 3

SPEAKER ATTENUATION OUT 4

SPEAKER ATTENUATION OUT 5

SPEAKER ATTENUATION OUT 6

XXX10010

XXXXXXXX

XXXXXXXX

00000000

XXXXXXXX

XXXXXXXX

00101111

Table 8. SPEAKER ATTENUATION SELECTION

MSB

D7

D6

D5

D4

D3

D2

0

0

0

0

1

1

1

1

0

0

0

0

0

0

0

0

0

1

0

0

0

1

0

0

0

0

1

1

0

0

1

0

0

0

0

1

0

1

0

0

1

1

0

0

0

1

1

1

0

1

1

0

1

1

value = 0 to -79dB and MUTE

LSB

D1

D0

0

0

0

1

1

0

1

1

0

0

0

1

1

0

1

1

SPEAKER ATTENUATION

0dB

-1dB

-2dB

-3dB

-4dB

-5dB

-6dB

-7dB

-0dB

-8dB

-16dB

-24dB

-32dB

-40dB

-48dB

-56dB

-64dB

-72dB

MUTE

7/14

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