CM108B Datasheet, PDF(2/24 Page) C-Media Electronics – A Highly Integrated USB Audio Single Chip

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CM108B Datasheet, PDF (2/24 Pages) C-Media Electronics – A Highly Integrated USB Audio Single Chip

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CM108B

USB Audio Single Chip

TABLE OF CONTENTS

1 Description and overview ......................................................................... 4

2 Ordering information .............................................................................. 4

3 Features ............................................................................................. 4

4 Pin descriptions ..................................................................................... 6

4.1 Pin assignment by pin number ............................................................... 6

4.2 Pin-out diagram................................................................................ 6

4.3 Pin signal descriptions ........................................................................ 7

5 Block diagram....................................................................................... 9

6 I2S Interface ...................................................................................... 10

7 Function description ............................................................................. 11

7.1 USB interface ................................................................................. 11

7.1.1 USB audio topology diagram for headset ..................................... 11

7.1.2 USB audio topology diagram for speaker ..................................... 12

7.1.3 Content format for EEPROM (93C46) .......................................... 13

7.1.4 EEPROM SPI interface timing information .................................... 14

7.2 Jumper pins and mode setting: ............................................................ 15

7.2.1 Mode pin and msel pin .......................................................... 15

7.2.2 Mode pin and pwrsel pin ........................................................ 15

7.3 HID feature .................................................................................... 16

7.3.1 HID descriptors ................................................................... 16

7.4 Internal Registers ............................................................................. 17

8 Electrical characteristics........................................................................ 20

8.1 Absolute maximum rating ................................................................... 20

8.2 Operation conditions.........................................................................20

8.3 Electrical parameters ........................................................................ 20

9 Package information ............................................................................. 22

Reference ............................................................................................... 23

Datasheet Revision: 1.11

Page 2 / 24

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