FSA9280A Ver la hoja de datos (PDF) - Fairchild Semiconductor

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Fabricante

FSA9280A

USB Port Multimedia Switch Featuring Automatic Select and Accessory Detection

Fairchild Semiconductor 

Accessory

Attached

INTB Asserted

BB Reads INTB

Configured Switch

Closes

XXFXLOXATXX

ID Resistance

INTB Pin

Open

Switch State

200ms

BB read

and

clear

10ms

wait

time

Closed

Figure 8. ID-Based Accessories, No VBUS_IN Attach Timing with Default Switching Wait Bits of 10ms

5.1. USB Port Detection

The multiple types of USB 2.0 ports that the FSA9280A can detect are summarized in Table 4. These devices are unique in

that VBUS must be present to detect these accessories.

Table 4. ID_CON and VBUS_IN Detection for USB Devices

ADC

Value(9)

ID_CON Resistance to GND

VBUS_IN DP_CON DP_CON

Min.

Typ.

Max.

Accessory Detected(10)

10111

5V

X

11011

5V

X

X

190k 200k 206k

X

428.7k 442k 455.3k

Car Kit Type 1 Charger(11)

Car Kit Type 2 Charger(11)

11111

5V

(12)

11111

5V

(12)

11111

5V

(12)

(12)

20M Open

Open

USB Dedicated Charging Port, Travel

Adapter or Dedicated Charger (DCP)

(12)

20M Open

Open USB Charging Downstream Port (CDP)

(12)

20M Open

Open USB Standard Downstream Port (SDP)

Notes:

9. The ADC values are reported in the ADC register (07h) with an each valid accessory detection.

10. The accessory type is reported in the Device Type 1 (0Bh) and Car Kit Status (0Eh) registers with an each valid

accessory detection.

11. Follows the ANSI/CEA-936-A USB Car Kit specification.

12. The FSA9280A follow the Battery Charging 1.1 specification, which uses DP_CON and DM_CON to determine what USB

accessory is attached (refer to the specification for details).

© 2009 Fairchild Semiconductor Corporation

FSA9280A • Rev 1.1.0

10

www.fairchildsemi.com

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