STA369BWS datasheet(72/89 Pages) STMICROELECTRONICS

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STA369BWS

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Doc ID 16861 Rev 4

6.16

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 21. The overall channel

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:

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).

VRESEN

VRESTG

C3VR[1]

C3VR[0]

C2VR[1]

C2VR[0]

C1VR[1]

C1VR[0]

000

Table 84.

Bits CxVR description

CxVR[1:0]

Mode

0 dB

-0.125 dB

-0.25 dB

-0.375 dB

Audio Data Out

CxVOL

Soft

Volume

Audio Data In

VRESEN

VRESTG

CxVR

MVOL or CxVOL’event

Audio Data Out

CxVOL

Soft

Volume

Audio Data In

VRESEN

VRESTG

CxVR

MVOL or CxVOL’event

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