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UM0290 Datasheet(PDF) 69 Page - STMicroelectronics

Part # UM0290
Description  This document presents a description
PDF  76 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

UM0290 Datasheet(HTML) 69 Page - STMicroelectronics

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UM0290
USB voice demos
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bInterfaceProtocol
0x00
InterfaceProtocol: AUDIO PROTOCOL
UNDEFINED
iInterface
0x00
Unused
USB speaker standard AS interface descriptor - audio streaming operational
(Interface 1, Alternate Setting 1)
bLength
0x09
Size of this descriptor in bytes
bDescriptortype
0x24
Descriptor type: AUDIO INTERFACE
DESCRIPTOR TYPE
bInterfaceNumber
0x01
Interface Number: 1
bAlternateSetting
0x01
Alternate Setting: 1
bNumEndpoints
0x01
One Endpoint.
bInterfaceClass
0x01
Interface Class: USB DEVICE CLASS
AUDIO
bInterfaceSubClass
0x02
Interface SubClass: AUDIO SUBCLASS
AUDIOSTREAMING
bInterfaceProtocol
0x00
InterfaceProtocol: AUDIO PROTOCOL
UNDEFINED
iInterface
0x00
Unused
USB speaker audio type I format interface descriptor
bLength
0x0B
Size of this descriptor in bytes
bDescriptortype
0x24
Descriptor type: AUDIO INTERFACE
DESCRIPTOR TYPE
bDescriptorSubtype
0x03
DescriptorSubtype: AUDIO STREAMING
FORMAT TYPE
bFormatType
0x01
Format Type: Type I
bNrChannels
0x01
Number of Channels: one channel
bSubFrameSize
0x01
SubFrame Size: one byte per audio
subframe
bBitResolution
0x08
Bit Resolution: 8 bits per sample
bSamFreqType
0x01
One frequency supported
tSamFreq
0x0055F0
22 kHz
Table 21.
Interface descriptors (continued)
Field
Value
Description



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