CM118B Datasheet, PDF (9/25 Pages) C-Media Electronics – Highly Integrated & Configurable USB Audio Single Chip

3.3 Microphone Topology
CM118B
Highly Integrated & Configurable USB Audio Single Chip
0X02
IT
0X0A
FEA
0X08
SEL
0X07
OT
Device Descriptor
Offset
Field
Size Value (Hex)
Description
0
bLength
1
12
Descriptor length
1
bDescriptorType
1
01
Device descriptor
2
bcdUSB
2
0110 USB 1.1 compliant
4
bDeviceClass
1
00
Device class specified by interface
5
bDeviceSubClass
1
00
Device subclass specified by interface
6
bDeviceProtocol
1
00
Device protocol specified by interface
7
bMaxPacketSize0
1
08
Endpoint zero packet size
8
idVendor
2
0d8c Vendor ID
10
idProduct
2
0016 Product ID
12
bcdDevice
2
0100 Device release number
14
iManufacturer
1
01
Index of string descriptor that characterizes the
manufacturer
15
iProduct
1
02
Index of string descriptor that characterizes the product
16
iSerialNumber
1
00
Index of string descriptor that characterizes the serial
number
17 bNumConfigurations
1
01
Number of configuration
Configuration Descriptor
Offset
Field
Size
0
bLength
1
1
bDescriptorType
1
2
wTotalLength
2
4
bNumInterfaces
1
5 bConfigurationValue
1
6
iConfiguration
1
7
bmAttributes
1
8
bMaxPower
1
Value (Hex)
Description
09
Descriptor length
02
Configuration descriptor
xxxx Total length of data returned for this configuration
Number of interfaces supported by this Configuration:
03
00: Control
01: ISO-IN
02: INT-IN (HID)
01
Configuration value
00
Index of string descriptor that characterizes this
configuration
80
Attributes(PWRSEL=0:Bus Powered, 1:SELF Powered)
32
Maximum power consumption from bus = 100mA
Datasheet Revision: 1.00
Page 9 / 25
www.cmedia.com.tw
Copyright© C-Media Electronics Inc.