STAC9204 datasheet(21/213 Pages) IDT

21 / 213 page

STAC9204/9205

4-CHANNEL HD AUDIO CODEC WITH QUAD DIGITAL MICROPHONE INTERFACE

PC AUDIO

IDT™

STAC9204/9205

V 1.0 12/06

4-CHANNEL HD AUDIO CODEC WITH QUAD DIGITAL MICROPHONE INTERFACE

For different analog supply voltages, Table 3 summarizes what ports can be detected and the resis-

tor tolerance needed.

Includes pull-up resistors on Sense A/B and series resistors between jack switch and Sense A/B.

See the reference design for more information on Jack Detect implementation.

1.3.8.2.

Impedance Sense

Impedance Sensing is accomplished by on-chip circuitry that tests the impedance at the pin of the

chip and compares it to internal reference impedance. Table 4 describes the bin information and the

codes that are returned when the Pin Widget Impedance field in the Port Pin Sense widget is read.

Please note that even under the best conditions, there is no method to guarantee 100% impedance

sensing due to variations in external circuitry and impedance overlap of devices that can be plugged

into a jack. The impedance sense table reflects both standard Line Out and Headphone output driv-

ers.

Table 3. Jack Detect

AVdd Nominal Voltage

(+/- 5%)

Resistor Tolerance

Sense A

(If port D is used)

Resistor Tolerance

Sense A

(If port D is not used)

Resistor Tolerance

Sense B

(For ports E and F)

5 V

1%1%1%

4.5 V

4 V

0.50%

3.3 V

0.10%

Table 4. Impedance Sense

Bins

Return Hex Code

Measured Impedance Level

General Device Detected

000b

0064h

Impedance < 300

Ω

Passive Speakers, Headset Speakers

001b

012Ch

Impedance = 300

Ω +/- 25%

Some Headset Speakers

010b

028Ah

300

Ω > Impedance < 1275 Ω

Some Microphones

011b

03E8h

Impedance = 1275

Ω +/- 25%

Microphones

100b

07D0h

1275

Ω > Impedance < 2000 Ω

Microphones

101b

0BB8h

Impedance = 2000

Ω +/- 25%

Amplified Speakers

110b

2710h

> 2000

Ω

Amplified Speakers, Line In

111b

2710h

> 2000

Ω

Amplified Speakers, Line In

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