sta381bws STMicroelectronics, sta381bws Datasheet - Page 145

• Manufacturer Part Number: sta381bws
• Description: Sound Terminal 2.1-channel High-efficiency Digital Audio System Sound Terminal 2.1-channel High-efficiency Digital Audio System
• Manufacturer: STMicroelectronics

STA381BWS
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
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
VRESEN
reserved
D7
D7
1
0
CxVR/MVR
MVOL or CxVOL’event
MVOL or CxVOL’event
00
01
10
11
CxVOL
CxVOL
VRESTG
reserved
D6
D6
0
0
Volume
Volume
Soft
Soft
reserved
C3VR[1]
-0.125 dB
-0.25 dB
-0.375 dB
0 dB
D5
D5
0
0
Doc ID 018937 Rev 2
CxVR
CxVR
1
1
Register description: Sound Terminal compatibility
reserved
C3VR[0]
X
X
D4
D4
0
0
0
0
VRESTG
VRESTG
reserved
C2VR[1]
D3
D3
0
0
Audio Data In
Audio Data In
0
0
1
1
VRESEN
VRESEN
Mode
reserved
C2VR[0]
Figure
X
X
D2
D2
0
0
Audio Data Out
Audio Data Out
41. The overall channel
C1VR[1]
MVR[1]
D1
D1
0
0
C1VR[0]
MVR[0]
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D0
D0
0
0