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FSA9280A

USB Port Multimedia Switch Featuring Automatic Select and Accessory Detection

Fairchild Semiconductor 

Table of Contents

Features ....................................................................................................................................................................................... 1

Description ................................................................................................................................................................................... 1

Applications .................................................................................................................................................................................. 1

Related Resources.......................................................................................................................................................................1

Table of Contents .........................................................................................................................................................................2

Block Diagram .............................................................................................................................................................................. 3

Pin Configuration..........................................................................................................................................................................3

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

1. Functionality .......................................................................................................................................................................... 5

1.1. Functional Overview ...................................................................................................................................................5

2. Power-up & Reset .................................................................................................................................................................6

2.1. Reset .......................................................................................................................................................................... 6

2.1.1. Hardware Reset...............................................................................................................................................6

2.1.2. Software Reset ................................................................................................................................................6

3. I2C ......................................................................................................................................................................................... 7

4. Configuration.........................................................................................................................................................................8

5. Detection ............................................................................................................................................................................... 8

5.1. USB Port Detection...................................................................................................................................................10

5.2. Audio Accessory Detection .......................................................................................................................................12

5.3. OCP and OVP Detection .......................................................................................................................................... 13

6. Processor Communication .................................................................................................................................................. 13

7. Switch Configuration ........................................................................................................................................................... 13

7.1. Manual Switching......................................................................................................................................................14

8. Active Signal Performance .................................................................................................................................................. 15

8.1. USB Data .................................................................................................................................................................. 15

8.2. FS USB.....................................................................................................................................................................15

8.3. Audio ........................................................................................................................................................................ 15

9. Electrical Specifications ...................................................................................................................................................... 16

9.1. Absolute Maximum Ratings ...................................................................................................................................... 16

9.2. Recommended Operating Conditions ....................................................................................................................... 16

9.3. Switch Path DC Electrical Characteristics.................................................................................................................16

9.4. Capacitance .............................................................................................................................................................. 18

9.5. Switch Path AC Electrical Characteristics.................................................................................................................18

9.6. I2C Controller DC Characteristics.............................................................................................................................. 19

9.7. I2C AC Electrical Characteristics & Register Map ..................................................................................................... 19

9.8. Factory Modes .......................................................................................................................................................... 23

9.8.1. Factory-Mode Accessory Detection ...............................................................................................................23

10. Reference Schematic .......................................................................................................................................................... 26

11. Layout Guidelines ............................................................................................................................................................... 27

11.1. PCB Layout Guidelines for High-Speed USB Signal Integrity ..................................................................................27

11.2. Layout for GSM/TDMA Buzz Reduction ...................................................................................................................27

11.3. VBUS_OUT Load Timing Requirements........................................................................................................................27

11.4. Systems with Multiple USB Controllers .................................................................................................................... 28

Physical Dimensions ..................................................................................................................................................................29

© 2009 Fairchild Semiconductor Corporation

FSA9280A • Rev 1.1.0

2

www.fairchildsemi.com

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