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

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FSA9280A

USB Port Multimedia Switch Featuring Automatic Select and Accessory Detection

Fairchild Semiconductor 

The FSA9280A monitors both VBUS_IN and ID_CON to detect

accessories. The ID_CON detection is a “resistive detection”

that detects the resistance to GND on the ID_CON pin to

determine which accessory is attached. Table 3 shows the

assignment of accessories based on resistor values.

Table 3. ID_CON Accessory Detection

Binary Value(4)

ID_CON Resistance to GND

Min.

Typ.

Max.

Accessory Detected(5)

00000

00001

00010

00011

00100

00101

00110

00111

01000

01001

01010

01011

01100

01101

01110

01111

10000

10001

10010

10011

10100

10101

10110

10111

11000

11001

11010

11011

11100

11101

11110

11111

GND

1.9k

2.470k

3.050k

3.810k

4.58k

5.73k

7.63k

9.53k

11.43k

13.74k

16.40k

19.48k

22.87k

27.27k

32.3k

38.19k

47.41k

61.66k

76.1k

96.9k

115k

143k

190k

247.3k

292k

347k

428.7k

507.3k

600.4k

750k

750k

20M

GND

2.0k

2.604k

3.208k

4.014k

4.82k

6.03k

8.03k

10.03k

12.03k

14.46k

17.26k

20.50k

24.07k

28.70k

34.0k

40.20k

49.90k

64.90k

80.7k

102.0k

121k

150k

200k

255k

301k

365k

442.0k

523k

619k

1000k

1002k

Open

GND

2.1k

2.730k

3.370k

4.210k

5.06k

6.33k

8.43k

10.53k

12.63k

15.18k

18.12k

21.53k

25.27k

30.14k

35.7k

42.21k

52.40k

68.15k

84.1k

107.1k

127k

157k

206k

262.7k

310k

383k

455.3k

538.7k

637.6k

1050k

1050k

DO NOT USE

Audio Send/End Button

Audio Remote S1 Button(6)

Audio Remote S2 Button(6)

Audio Remote S3 Button(6)

Audio Remote S4 Button(6)

Audio Remote S5 Button(6)

Audio Remote S6 Button(6)

Audio Remote S7 Button(6)

Audio Remote S8 Button(6)

Audio Remote S9 Button(6)

Audio Remote S10 Button(6)

Audio Remote S11 Button(6)

Audio Remote S12 Button(6)

Reserved Accessory #1

Reserved Accessory #2

Reserved Accessory #3

Reserved Accessory #4

Reserved Accessory #5

DO NOT USE

DO NOT USE

TTY Converter

UART Cable

USB: See Table 4

Factory Mode Boot OFF-USB

Factory Mode Boot ON-USB

Audio Cradle

USB: See Table 4

Factory Mode Boot OFF-UART

Factory Mode Boot ON-UART

Audio Type 1 with Remote(8)

Audio Type 1 / Only Send-End(8)

USB Mode, Dedicated Charger or Accessory Detach

Notes:

4. The binary values are reported in the binary register (07h) with each valid accessory detection.

5. The accessory type is reported in the Device Type 1 (0Bh), Device Type 2 (0Bh), Button 1 (0Ch), and Button 2 (0Dh)

registers with each valid accessory detection.

6. These resistor values are created by multiple standard resistor values in series to form the button presses on the wired

remote (see Figure 12).

7. For the ID float, ID “open” is recommended; otherwise, capacitance should be minimized.

8. Audio devices with remote and audio devices with only send/end are both reported as Audio Type 1 in the Device Type 1

register (see the Audio Accessory Detection section below). Type 1 is for passive resistor audio accessories and a future

Audio Type 2 is designated for active audio accessories.

© 2009 Fairchild Semiconductor Corporation

FSA9280A • Rev 1.1.0

9

www.fairchildsemi.com

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