sta335bws13tr STMicroelectronics, sta335bws13tr Datasheet - Page 72

• Manufacturer Part Number: sta335bws13tr
• Description: 2.1-channel 40-watt High-efficiency Digital Audio System Sound Terminal?
• Manufacturer: STMicroelectronics

Register description
6.16
72/89
Extra volume resolution configuration registers (addr 0x3F)
Extra volume resolution allows fine volume tuning in steps of 0.125 dB.
The feature is enabled when VRESEN = 1, as depicted in
volume in this case is CxVol + CxVR (in dB).
Figure 21. Extra resolution volume scheme
If VRESEN = 0 the channel volume is defined only by CxVol registers.
Fine tuning steps can be set according to the following table for channels 1, 2, 3:
Table 84.
Two different behaviors can be configured by VRESTG bit.
If VRESTG = 0 the CxVR contribution is applied immediately after the corresponding I
bits are written.
If VRESTG = 1 the CxVR bits are effective on channel volume only after the corresponding
CxVol register or master volume register is written (even to the previous values).
00
01
10
11
VRESEN
D7
CxVR[1:0]
0
MVOL or CxVOL’event
MVOL or CxVOL’event
Bits CxVR description
CxVOL
CxVOL
VRESTG
D6
0
-0.125 dB
-0.25 dB
-0.375 dB
0 dB
Volume
Volume
C3VR[1]
Soft
Soft
D5
0
Doc ID 16861 Rev 3
CxVR
CxVR
1
1
C3VR[0]
X
X
D4
0
0
0
VRESTG
VRESTG
C2VR[1]
D3
0
Audio Data In
Audio Data In
0
0
1
1
Mode
VRESEN
VRESEN
Figure
C2VR[0]
X
X
D2
0
21. The overall channel
Audio Data Out
Audio Data Out
C1VR[1]
D1
0
STA369BWS
C1VR[0]
D0
0
2
C