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STA381BWS 데이터시트(PDF) 146 Page - STMicroelectronics

부품명 STA381BWS
상세설명  Sound Terminal® 2.1-channel high-efficiency digital audio system
PDF  171 Pages
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
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STA381BWS 데이터시트(HTML) 146 Page - STMicroelectronics

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Register description: Sound Terminal compatibility
STA381BWS
146/171
Doc ID 018937 Rev 6
7.18
Extra volume resolution configuration registers (address
0x3F; 0x40)
Extra volume resolution allows fine volume tuning by steps of 0.125 dB.
The feature is enabled when VRESEN=1, as depicted in Figure 41. The overall channel
volume in this case will be CxVol+CxVR (in dB), while the master volume will be
MVOL+MVR (in dB).
Figure 41.
Extra resolution volume scheme
If VRESEN = 0 the channel volume will be defined only by the CxVol registers.
Fine tuning steps can be set according to the following table for channels 1, 2,3, and master
volume.
Table 162.
Volume fine-tuning steps
D7
D6
D5
D4
D3
D2
D1
D0
VRESEN
VRESTG
C3VR[1]
C3VR[0]
C2VR[1]
C2VR[0]
C1VR[1]
C1VR[0]
10
00
00
0
0
D7
D6
D5
D4
D3
D2
D1
D0
reserved
reserved
reserved
reserved
reserved
reserved
MVR[1]
MVR[0]
00
00
00
0
0
CxVR/MVR
Mode
00
0 dB
01
-0.125 dB
10
-0.25 dB
11
-0.375 dB
Audio Data Out
CxVOL
Soft
Volume
X
X
Audio Data In
VRESEN
VRESTG
CxVR
MVOL or CxVOL’event
1
0
0
1
Audio Data Out
CxVOL
Soft
Volume
X
X
Audio Data In
VRESEN
VRESTG
CxVR
MVOL or CxVOL’event
1
0
0
1



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