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STA382BW датащи(PDF) 146 Page - STMicroelectronics

номер детали STA382BW
подробное описание детали  Sound Terminal® 2.1-channel high-efficiency digital audio system
PDF  172 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
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STA382BW датащи(HTML) 146 Page - STMicroelectronics

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Register description: Sound Terminal compatibility
STA382BW
146/172
Doc ID 022783 Rev 1
7.17
EQ soft volume configuration registers (addr 0x37 - 0x38)
The soft volume update has a fixed rate by default. Using register 0x37 and 0x38 it is
possible to override the default behavior, allowing different volume change rates.
It is also possible to independently define the fade-in (volume is increased) and fade-out
(volume is decreased) rates according to the desired behavior.
Table 162.
Soft volume update enable, increase
When SVUPE = 1 the volume-up rate is defined by the SVUP[4:0] bits according to the
following formula:
volume-up rate = 48 / (N + 1) dB/ms
where N is the SVUP[4:0] value.
Table 163.
Soft volume update enable, decrease
When SVDWE = 1 the volume-down rate is defined by the SVDW[4:0] bits according to the
following formula:
volume-down rate = 48 / (N + 1) dB/ms
where N is the SVDW[4:0] value.
Note:
For volume-down rates greater than 6 dB/msec it is recommended to disable the CPWMEN
bit and ZCE bit in order to avoid any audible pop noise.
D7
D6
D5
D4
D3
D2
D1
D0
Reserved
Reserved
SVUPE
SVUP[4]
SVUP[3]
SVUP[2]
SVUP[1]
SVUP[0]
00
00
00
0
0
D7
D6
D5
D4
D3
D2
D1
D0
Reserved
Reserved
SVDWE
SVDW4]
SVDW[3]
SVDW[2]
SVDW[1]
SVDW[0]
00
00
00
0
0
SVUPE
Mode
0
When volume is increased, use the default rate
1
When volume is increased, use the rates defined by SVUP[4:0].
SVDWE
Mode
0
When volume is decreased, use the default rate
1
When volume is decreased, use the rates defined by SVDW[4:0].



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