AK4571 Datasheet, PDF (43/54 Pages) Asahi Kasei Microsystems – USB I/F Audio CODEC

ASAHI KASEI
[AK4571]
5.1.3. Volume Control
Volume
ADC
DAC
L(channel 1)/R(channel 2)
Offset
0
1
2
4
Field
bmRequestType
bRequest
wValue
Size
1
1
2
wIndex
2
Value
0x21
0x01
0x0200
0x0201
0x0202
0x0 500
0x0600
0x0 800
0x0800
6
wLength
2
0x0002
Description
SET_CUR
A/D: VOLUME_CONTROL | Master Channel
DAC: VOLUME_CONTROL | CHANNEL_1
DAC: VOLUME_CONTROL | CHANNEL_2
A/D Feature Unit ID : 0x05 MIC REC Master CH
A/D Feature Unit ID : 0x06 MIC PLAY Master CH
D/A Feature Unit ID : 0x08 Lineout Lch Volume
D/A Feature Unit ID : 0x08 Lineout Rch Volume
Lower Byte : Audio Control Interface(0x00)
Volume Control
Offset Field
0
wVolume
Size Value
2
0xZZZZ
USB Audio Class
Description
The value is set by host
n FU1(ID5 MIC
),FU2(ID6 MIC
)
Volume (USB
1byte 00H
)
Volume Value
24.0dB
--------
24.0dB
23.0dB
--------
0.0dB
--------
-30.0dB
-31.0dB
-31.0dB
USB Audio Class
Format
0x7FFF
--------
0x1800
0x17FF
--------
0x0000
-------
0xE200
0xE1FF
-------
0x8000
n FU 3 (Unit ID 8, AS I/F 2 : LineOut )
Volume USB
1byte 00H
Volume Value
0.0dB
--------
0.0dB
-1.0dB
-2.0dB
-------
-46.0dB
-47.0dB
--------
-47.0dB
USB Audio Class
Format
0x7FFF
--------
0x0000
0xFF00
0xFE00
---------
0xD200
0xD100
--------
0x8000
MS0153-J-02
- 43 -
2003/3