AK5371AVQ AKM [Asahi Kasei Microsystems], AK5371AVQ Datasheet - Page 27

• Manufacturer Part Number: AK5371AVQ
• Description: 2ch A/D Converter with USB I/F
• Manufacturer: AKM [Asahi Kasei Microsystems]

MS0546-E-00
5.1.2
AKM USB Microphone supports only one form of parameter block.
a) Mute Control
Offset
0
1
2
4
6
The device outputs the current setting of mute status.
Offset
0
b) Volume Control
Offset
0
1
2
4
6
The parameter block of Volume Control is the following.
Offset
0
Table 1 is the conversion map of USB class and internal volume register.
When host requests the volume value which is larger than the MAX value in the device, the device is set the MAX
value to the volume. When host requests the volume value which is smaller than the MIN value in the device, the
device is set the MIN value to the volume. RES value is 1.0dB.
ASAHI KASEI
MS0103-E-00
Get Feature Unit Control Request
Field
bmRequestType
bRequest
wValue
wIndex
wLength
Field
bMute
Field
bmRequestType
bRequest
wValue
wIndex
wLength
Field
wVolume
Size
Size
Size
Size
1
1
2
2
2
1
1
1
2
2
2
2
Value
0xA1
0x81
0x0100
0x0300
0x0001
Value
0x01
0x00
Value
0xA1
0x81
0x82
0x83
0x84
0x0201
0x0202
0x0300
0x0002
Value
0xZZYY
0xE100
0x1800
0x0100
Description
GET_CUR
MUTE_CONTROL | CHANNEL_0
Upper Byte : bUnit ID field in Feature Unit
Descriptor.(0x03)
Lower Byte : Audio Control Interface(0x00)
The Length of Mute Control Parameter Block
Description
TRUE
FALSE
Description
GET_CUR
GET_MIN
GET_MAX
GET_RES
VOLUME_CONTROL | CHANNEL_1
VOLUME_CONTROL | CHANNEL_2
Upper Byte : bUnit ID field in Feature Unit
Descriptor.(0x03)
Lower Byte : Audio Control Interface(0x00)
Volume Control
Description
bRequest = GET_CUR : returns current volume.
YY must be 00h
bRequest = GET_MIN : -31dB
bRequest = GET_MAX : +24dB
bRequest = GET_RES : 1.0dB
27
[AK5371A]
2007/02