參數(shù)資料
型號: AK5371A
廠商: Asahi Kasei Microsystems Co.,Ltd
英文描述: 2ch A/D Converter with USB I/F
中文描述: 2通道的A / D轉(zhuǎn)換器的USB我/女
文件頁數(shù): 27/32頁
文件大?。?/td> 317K
代理商: AK5371A
27
MS0103-E-00
MS0546-E-00
ASAHI KASEI
[AK5371A]
2007/02
5.1.2
AKM USB Microphone supports only one form of parameter block.
a) Mute Control
Offset
Field
Size
0
bmRequestType
1
1
bRequest
1
2
wValue
2
4
wIndex
2
Get Feature Unit Control Request
Value
0xA1
0x81
0x0100
0x0300
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
6
The device outputs the current setting of mute status.
Offset
Field
0
bMute
wLength
2
0x0001
Size
1
Value
0x01
0x00
Description
TRUE
FALSE
b) Volume Control
Offset
0
1
Field
bmRequestType
bRequest
Size
1
1
Value
0xA1
0x81
0x82
0x83
0x84
0x0201
0x0202
0x0300
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
2
wValue
2
4
wIndex
2
6
The parameter block of Volume Control is the following.
Offset
Field
0
wVolume
wLength
2
0x0002
Size
2
Value
0xZZYY
0xE100
0x1800
0x0100
Description
bRequest = GET_CUR : returns current volume.
YY must be 00h
bRequest = GET_MIN : -31dB
bRequest = GET_MAX : +24dB
bRequest = GET_RES : 1.0dB
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.
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