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UM0290 Datasheet(PDF) 71 Page - STMicroelectronics |
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UM0290 Datasheet(HTML) 71 Page - STMicroelectronics |
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71 / 76 page  UM0290 USB voice demos 71/76 Table 24. Configuration descriptor Field Value Description bLength 0x09 Size of this descriptor in bytes bDescriptortype 0x02 Descriptor type (Configuration descriptor) wTotalLength 0x64 Total length (in bytes) of the returned data by this descriptor (including interfaces endpoints descriptors) bNumInterfaces 0x0002 Number of interfaces supported by this configuration (two interfaces) bConfigurationValue 0x01 Configuration value iConfiguration 0x00 Index of the Configuration String descriptor bmAttributes 0x80 Configuration characteristics: Bus powered Maxpower 0x32 Maximum power consumption through USB bus: 100 mA Table 25. Interface descriptors Field Value Description USB microphone standard interface AC descriptor (Interface 0, Alternate Setting 0) bLength 0x09 Size of this descriptor in bytes bDescriptortype 0x04 Descriptor type: Interface descriptor bInterfaceNumber 0x00 Interface number bAlternateSetting 0x00 Alternate setting number bNumEndpoints 0x00 Number of used endpoints: 0 (only endpoint 0 is used for this interface) bInterfaceClass 0x01 Interface class: USB DEVICE CLASS AUDIO bInterfaceSubClass 0x01 Interface sub class: AUDIO SUBCLASS AUDIOCONTROL bInterfaceProtocol 0x00 Interface protocol: AUDIO PROTOCOL UNDEFINED iInterface 0x00 Index of the interface String descriptor USB microphone class-specific AC interface descriptor bLength 0x09 Size of this descriptor in bytes bDescriptortype 0x24 Descriptor type: AUDIO INTERFACE DESCRIPTOR TYPE bDescriptorSubtype 0x01 Descriptor Subtype: AUDIO CONTROL HEADER bcdADC 0x0100 bcdADC :1.00 wTotalLength 0x001E Total Length: 30 |
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