AK5374 AKM [Asahi Kasei Microsystems], AK5374 Datasheet - Page 43

• Manufacturer Part Number: AK5374
• Description: 24-bit Stereo ADC with USB Interface
• Manufacturer: AKM [Asahi Kasei Microsystems]

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1. Set Feature Unit Control Request
1-1. Mute Control
The parameter block of mute control is the following.
1-2. Volume Control
The parameter block of volume control is the following.
If the wVolume exceeds the range, the AK5374 adjusts the value into the range.
MS1197-E-00
Offset
Offset
Offset
Offset
Audio Control Requests
0
1
2
4
6
0
0
1
2
4
6
0
bmRequestType
bRequest
wValue
wIndex
wLength
bMute
bmRequestType
bRequest
wValue
wIndex
wLength
wVolume
Field
Field
Field
Field
Size
Size
Size
Size
1
1
2
2
2
1
1
1
2
2
2
2
0x21
0x01
0x0100
0x0300
0x0001
0x01
0x00
0x21
0x01
0x0200
0x0201
0x0202
0x0300
0x0002
0xZZZZ
Value
Value
Value
Value
- 43 -
SET_CUR
MUTE_CONTROL | CHANNEL_0
Upper byte: bUnitID field in Feature Unit Control Descriptor
(0x03)
Lower byte: Audio Control Interface (0x00)
Length of parameter block
Mute
Not mute
SET_CUR
VOLUME_CONTROL | CHANNEL_0 (Master)
VOLUME_CONTROL | CHANNEL_1
VOLUME_CONTROL | CHANNEL_2
Upper byte: bUnit ID field in Feature Unit Control Descriptor
(0x03)
Lower byte: Audio Control Interface (0x00)
Length of Parameter Block
The value is mapped to the volume register value.
(ZZZZ is assigned by Host.)
Description
Description
Description
Description
(Table
[AK5374]
2010/05
8)