DA7219 datasheet(45/123 Pages) DIALOG

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DA7219

Audio codec with Advanced Accessory Detect

Company confidential

Datasheet

Revision 2.1

17-Dec -2015

45 of 123

9.5.3

Three-pole or four-pole jack insertion

The type of jack inserted can be determined automatically by setting jack_type_det_en = 1.

Once the jack insertion measurement has been completed as indicated by

e_jack_detect_complete = 1, the AAD determines whether a three-pole or a four-pole jack has been

inserted. This is done by measuring the resistance between the SLEEVE and the RING2 pins. If the

measured impedance is below the threshold setting, a three-pole jack is deemed to have been

inserted. If the resistance is above this threshold setting, a four-pole jack is deemed to have been

inserted.

Note that if a mono two-pole jack is inserted, the AAD will detect this as a three-pole jack, but the

two-pole jack will work as designed, that is, as a mono output.

The threshold setting used to determine whether a three-pole or a four-pole jack has been inserted is

set using mic_det_thresh. The settings are listed in Table 33.

Table 33: Resistance threshold settings for three-pole and four-pole jack determination

mic_det_thresh

Resistance

threshold (

Ω)

200

500 (default)

750

1000

Once the jack type has been successfully determined, the type of jack is recorded in jack_type_sts. A

three-pole jack is indicated by jack_type_sts = 0, and a four-pole jack by jack_type_sts = 1.

The jack type status recorded in the register field jack_type_sts is not valid until the measurement

has been completed. Measurement completion is indicated when e_jack_detect_complete = 1. Note

that e_jack_detect_complete = 1 indicates the completion of both the jack_type_sts measurement

and the jack_pin_order_sts measurement.

The measurement of the type of jack, which is performed automatically when jack_type_det_en = 1,

can be overridden if required. To do this, set jack_type_det_en = 0 to prevent the measurement

taking place, and then use the jack_type_force register field to force the jack type. A three-pole jack

is specified by setting jack_type_force = 0, and a four-pole jack by setting jack_type_force = 1.

9.5.4

Jack pin order detection with four-pole jacks

Two different polarities are widely used with four-pole jacks. These are the CTIA tip-ring-ring-sleeve

configuration of GND-MIC-RIGHT-LEFT, and the OMTP configuration of MIC-GND-RIGHT-LEFT.

If pin_order_det_en = 1, the detection of jack configuration is performed automatically. The

measurement of jack configuration can be overridden by setting pin_order_det_en = 0, and using

pin_order_force = 0 to specify the CTIA configurations. Setting pin_order_force = 1 specifies the

OMTP configuration.

The jack configuration status recorded in the register field jack_pin_order_sts is not valid until the

measurement has been completed. Measurement completion is indicated when

e_jack_detect_complete = 1. Note that e_jack_detect_complete = 1 indicates the completion of both

jack_type_sts measurement and jack_pin_order_sts measurement.

DA7219 Datasheet(PDF) 45 Page - Dialog Semiconductor

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