AD1988BJSTZ datasheet(18/20 Pages) AD

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AD1988A/AD1988B

Rev. 0 | Page 18 of 20

JACK PRESENCE DETECTION

HD AUDIO STYLE JACK PRESENCE DETECTION

The AD1988 uses two jack sense pins for presence detection on

up to eight audio jacks. This, combined with the device identifi-

cation engine, enables software to determine if there is a device

plugged into the circuit, and the type of device it is. Allowing

software to configure jacks and amplifiers, as necessary, ensures

proper audio operation.

Detect jack presence by using a resistor tree arrangement

detailed by the HD audio specification, allowing up to four

jacks per sense line. Jacks must have normally open, isolated

switches to use this method of jack presence detection.

For proper operation, there must be a 2.67 kΩ 1% resistor

connected between SENSE_A and AVDD, and another 2.67 kΩ

1% resistor between SENSE_B and AVDD.

The specific resistor values for each jack are listed in Table 16.

Use 1% tolerance resistors to ensure accurate detection.

Table 16. Jack Sense Mapping

Resistor Value

SENSE_A

SENSE_B

(1% Tolerance)

Name

Port

Node ID

Name

Port

Node ID

2.67 kΩ

Pull-up to AVDD

5.10 kΩ

FRONT

0x12

SURR_SIDE (7.1)

0x25

10.0 kΩ

LINE IN

0x15

C/LFE

0x24

20.0 kΩ

FRONT_MIC

0x14

SURR_BACK (5.1)

0x16

39.2 kΩ

HP_OUT

0x11

REAR_MIC

0x17

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