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FSA9280A

USB Port Multimedia Switch Featuring Automatic Select and Accessory Detection

Fairchild Semiconductor 

The following figures show the attach timing of the USB

accessories and the relationship between the INTB assertion

and the CHG_DET assertion. FSA9280A implements the

optional data contact detection (DCD) feature of the USB

Battery Charging specification. The DCD detection ensures

VBUS >4.0V

proper connection of the DP_CON and DM_CON before

starting the USB charging detection scheme. This feature

allows for shorter attach times by eliminating long wait times

to allow full contact of the DP_CON and DM_CON pins.

Charger FET Closed

INTB Asserted and

registers written

VBUS Voltage

XXXXFXLOXATXXXXXXXXXXXXXXXXXXXXXXXXXXXXXFXLOXAXT XXXXXXXXXXX

ID Resistance

VBUS_OUT

170ms

Switch State

Closed (CDP Only)

CHG_DET Pin

INTB Pin

DCD-20ms

CHG DETECTION 150ms

100ms

Figure 9. USB Dedicated Charging Port (DCP) or Charging Downstream Port (CDP) Attach Timing

VBUS >4.0V

Charger FET Closed

USB Switches Closed

VBUS_IN

XXXXFXLOXATXXXXXXXXXXXXXXXXXXXXXXXXXXXXXFXLOXAXT XXXXXXXXXXX

ID Resistance

VBUS_OUT

DCD Checking 20ms

Open

USB Switch State

Charger Detection Time 110ms

130ms

Closed

Figure 10. USB Standard Downstream Port Attach Timing

VBUS >4.0V

VBUS Voltage

XXXFLXOXATXXX

ID Resistance

VBUS_OUT

Open

Switch State

Charger FET Closed

Configured Switches Closed

ID Detection Time 200ms

CHG_DET Pin

INTB Pin

200ms

100ms

Figure 11. Car Kit Type 1 and 2 Attach Timing

© 2009 Fairchild Semiconductor Corporation

FSA9280A • Rev 1.1.0

11

www.fairchildsemi.com

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