STA369BWSTR datasheet(74/92 Pages) STMICROELECTRONICS

Part #	STA369BWSTR

Description	2.1-channel 40-watt high-efficiency digital audio system Sound Terminal®

PDF	92 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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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).

VRESEN

VRESTG

C3VR[1]

C3VR[0]

C2VR[1]

C2VR[0]

C1VR[1]

C1VR[0]

00000000

Table 85. Bits CxVR description

CxVR[1:0]

Mode

0 dB

-0.125 dB

-0.25 dB

-0.375 dB

STA369BWSTR Datasheet(PDF) 74 Page - STMicroelectronics