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STA369BWSTR bảng dữ liệu(PDF) 74 Page - STMicroelectronics

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Giải thích chi tiết về linh kiện  2.1-channel 40-watt high-efficiency digital audio system Sound Terminal®
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Register description
STA369BWS
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DocID016861 Rev 7
7.16
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 Figure 22. The overall channel
volume in this case is CxVol + CxVR (in dB).
Figure 22. 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:
Two different behaviors can be configured by VRESTG bit.
If VRESTG = 0 the CxVR contribution is applied immediately after the corresponding I2C
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).
D7
D6
D5
D4
D3
D2
D1
D0
VRESEN
VRESTG
C3VR[1]
C3VR[0]
C2VR[1]
C2VR[0]
C1VR[1]
C1VR[0]
00000000
Table 85. Bits CxVR description
CxVR[1:0]
Mode
00
0 dB
01
-0.125 dB
10
-0.25 dB
11
-0.375 dB



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