BU26156RFS Datasheet, PDF (52/95 Pages) Rohm – Monoraul MIC Input with ALC

BU26156RFS
Datasheet
Amplifier Volume Control Function Enable Register
MAPCON
INDEX
b07
b06
b05
b04
b03
b02
b01
b00
R
W
(Initial)
0x0
0x48 0x49
-
-
-
-
-
-
AVMUTE AVFADE
-
-
-
-
-
-
0
0
This register is to set the Mixvol volume fade function and mute function.
AVFADE
This bit is to set the ON and OFF of the Mixvol volume fade function.
AVFADE
Description
Fade function OFF
0
The register setting value of SPVOL is used actual volume value as it is. Therefore the
value is effective immediate.
Fade function ON
1
The volume is changing to the register setting value of SPVOL with 1 step per
AVFCON register step time.
AVMUTE
This bit is to set the volume to the mute state. The fade function by AVFADE is effective against the volume change by this bit.
And MixVol Volume value by SPVOL is held and return to setting Volume on release AVMUTE
Value
Description
0
MixVol volume is set to MUTE OFF.
Register value of SPVOL is effective for MixVol volume.
MixVol volume is set to MUTE.
1
Register value of SPVOL cannot be changed by this bit, the volume is resumed by
releasing this bit (AVMUTE=0) to the original setting value of SPVOL.
* Related Register
SPVOL: MixVolVolume Control Register (0x3a/0x3b)
AVFCON: MixVol Volume Fader Control Register (0x4a/0x4b)
Amplifier Volume Fader Control Register
MAPCON
INDEX
b07
b06
b05
b04
b03
b02
b01
b00
R
W
(Initial)
0x0
0x4a 0x4b
-
-
-
-
-
AVFCON
-
-
-
-
-
0
0
0
This register controls the MixVol volume fade function.
AVFCON[2:0]
These bits are to set the volume change step time of the MixVol volume fade function. The volume changes step by step with
this setting period. Step time is in proportion to sampling frequency (fs) as following table.
AVFCON[2:0] fs equivalent
Time(fs=48kHz)
0x0
1/fs
0x1
4/fs
0x2
16/fs
0x3
64/fs
0x4
256/fs
0x5
1024/fs
0x6
4096/fs
0x7
16384/fs
20.8µs
83.3µs
333µs
1.33ms
5.33ms
21.3ms
85.3ms
341.ms
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TSZ22111・15・001
52/92
TSZ02201-0V1V0E502570-1-2
Jul.1.2014 Rev.001