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STA382BW データシート(PDF) 147 Page - STMicroelectronics

部品番号 STA382BW
部品情報  Sound Terminal® 2.1-channel high-efficiency digital audio system
PDF  172 Pages
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メーカー  STMICROELECTRONICS [STMicroelectronics]
ホームページ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STA382BW データシート(HTML) 147 Page - STMicroelectronics

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STA382BW
Register description: Sound Terminal compatibility
Doc ID 022783 Rev 1
147/172
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 164.
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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