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STA381BWS Datasheet(PDF) 149 Page - STMicroelectronics

No. de pieza STA381BWS
Descripción Electrónicos  Sound Terminal 2.1-channel high-efficiency digital audio system
PDF  174 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STA381BWS Datasheet(HTML) 149 Page - STMicroelectronics

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STA381BWS
Register description: Sound Terminal compatibility
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 43. The overall channel
volume in this case will be CxVol+CxVR (in dB), while the master volume will be
MVOL+MVR (in dB).
Figure 43. 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]
10000000
D7
D6
D5
D4
D3
D2
D1
D0
reserved
reserved
reserved
reserved
reserved
reserved
MVR[1]
MVR[0]
00000000
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
Obsolete
Product(s)
- Obsolete
Product(s)



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