PI3USB9281 datasheet(9/13 Pages) DIODES

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2014-04-0004

PT0502-1

04/28/14

PI3USB9281

USB 2.0 Port Protection with Charger Detection

USB Port Detection Timing

The following figures show the attach timing of the USB after insertion of accessories and the relationship between the INTB

assertion and the CHG assertion. PI3USB9281 has incorporated a VBUS de-bounce circuit that waits a settle time of the USB cable.

Figure 4. USB Charging Downstream Port (CDP) Attach Timing

Figure 5. USB Dedicated Charging Port (DCP) Attach Timing

VBUSIN>4.0V

Charger FET closed, INTB

asserted and registers written

INTB Pin

CHG Pin

50ms

VBUSIN Voltage

VBUSOUT

200ms

ID Floating

USB switch

Open

Closed

200ms

VBUSIN>4.0V

Charger FET closed, INTB

asserted and registers written

INTB Pin

CHG Pin

50ms

VBUSIN Voltage

VBUSOUT

VBUSIN Valid 130mS

250ms

CHG detection 70ms

ID Floating

USB switch

Open

Closed

200ms

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