STA321 Datasheet, PDF (120/157 Pages) STMicroelectronics – 4-channel digital audio system with FFX™ driver

Register description
STA321
VOLCFG
7
6
5
4
3
2
1
0
SVOL_ON3
SVOL_ON2
SVOL_ON1
SVOL_ON0
TIM_SVOL
Address:
Type:
Reset:
Description:
0xA0
RW
0xF5
The register sets up the soft volume control
MVOL
[7] SVOL_ON3
0: volume on channel 3 is updated immediately
1: volume on channel 3 is updated gradually with a ramp
[6] SVOL_ON2
0: volume on channel 2 is updated immediately
1: volume on channel 2 is updated gradually with a ramp
[5] SVOL_ON1
0: volume on channel 1 is updated immediately
1: volume on channel 1 is updated gradually with a ramp
[4] SVOL_ON0
0: volume on channel 0 is updated immediately
1: volume on channel 0 is updated gradually with a ramp
[3:0] TIM_SVOL
Set the volume ramp; each volume step (0.5 dB) takes (2^TIM_SVOL / f_S) s
Master volume control
7
6
5
4
3
2
1
0
MVOL
Address:
Type:
Reset:
Description:
0xA1
RW
0x00
[7:0] MVOL
Master volume from 0 dB to -127.5 dB in 0.5 dB steps (volume = MVOL * 0.5 dB)
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Doc ID 15351 Rev 3