CM118B Datasheet, PDF(3/25 Page) C-Media Electronics – Highly Integrated & Configurable USB Audio Single Chip

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CM118B Datasheet, PDF (3/25 Pages) C-Media Electronics – Highly Integrated & Configurable USB Audio Single Chip

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CM118B

Highly Integrated & Configurable USB Audio Single Chip

LIST OF CONTENTS

1. Ordering Information .................................................................................................................... 4

2. Pin Descriptions.............................................................................................................................. 4

2.1 Pin Assignment by Pin Number..................................................................................................... 4

2.2 Pin-Out Diagram............................................................................................................................ 4

2.3 Pin Signal Descriptions.................................................................................................................. 5

3. USB Topology .................................................................................................................................. 7

3.1 Headset Topology with Mixer ....................................................................................................... 7

3.2 Speaker Topology .......................................................................................................................... 8

3.3 Microphone Topology.................................................................................................................... 9

4. Function Description ................................................................................................................... 10

4.1 Content Format for EEPROM (93C46) ....................................................................................... 10

4.2 EEPROM SPI Interface Timing Information .............................................................................. 11

4.3 Jumper Pins and Mode Settings................................................................................................... 12

4.4 MCU Interface ............................................................................................................................. 13

4.5 HID Feature and Descriptor......................................................................................................... 17

4.6 Internal Registers ......................................................................................................................... 18

5. Electrical Characteristics ........................................................................................................... 22

5.1 Absolute Maximum Rating ....................................................................................................... 22

5.2 DC Specifications ...................................................................................................................... 22

5.3 Operation Conditions................................................................................................................ 22

5.4 Electrical Parameters............................................................................................................... 23

6. Package dimensions..................................................................................................................... 24

Reference................................................................................................................................................ 25

Datasheet Revision: 1.00

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