WM5102 datasheet(183/334 Pages) WOLFSON

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Production Data

WM5102

PD, June 2014, Rev 4.2

183

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R676

(02A4h)

Mic Detect 2

7:0

MICD_LVL_SEL

[7:0]

1001_

1111

Mic Detect Level Select

(enables Mic/Accessory Detection in

specific impedance ranges)

[7] = Enable >475 ohm detection

[6] = Not used - must be set to 0

[5] = Not used - must be set to 0

[4] = Enable 375 ohm detection

[3] = Enable 155 ohm detection

[2] = Enable 73 ohm detection

[1] = Enable 40 ohm detection

[0] = Enable 18 ohm detection

Note that the impedance values quoted

assume that a microphone (475ohm-

30kohm) is also present on the MICDET

pin.

R677

(02A5h)

Mic Detect 3

10:2

MICD_LVL [8:0]

0_0000_

0000

Mic Detect Level

(indicates the measured impedance)

[8] = >475 ohm, <30k ohm

[7] = Not used

[6] = Not used

[5] = 375 ohm

[4] = 155 ohm

[3] = 73 ohm

[2] = 40 ohm

[1] = 18 ohm

[0] = <3 ohm

Note that the impedance values quoted

assume that a microphone (475ohm-

30kohm) is also present on the MICDET

pin.

MICD_VALID

Mic Detect Data Valid

0 = Not Valid

1 = Valid

MICD_STS

Mic Detect Status

0 = No Mic/Accessory present

(impedance is >30k ohm)

1 = Mic/Accessory is present (impedance

is <30k ohm)

Table 76 Microphone Detect Control

The external connections for the Microphone Detect circuit are illustrated in Figure 64. In typical

applications, it can be used to detect a microphone or button press.

Note that, when using the Microphone Detect circuit, it is recommended to use one of the Right

channel analogue microphone input paths, to ensure best immunity to electrical transients arising from

the external accessory.

The voltage reference for the microphone detection is configured using the MICD_BIAS_SRC register,

as described in Table 76. The microphone detection function will automatically enable the applicable

reference when required for MICDET impedance measurement.

If the selected reference (MICBIAS1, MICBIAS2 or MICBIAS3) is not already enabled (ie. if

MICBn_ENA = 0, where n is 1, 2 or 3 as appropriate), then the applicable MICBIAS source will be

enabled for short periods of time only, every time the impedance measurement is scheduled. To allow

time for the MICBIAS source to start-up, a time delay is applied before the measurement is performed;

this is configured using the MICD_BIAS_STARTTIME register, as described in Table 76.

The MICD_BIAS_STARTTIME register should be set to 16ms or more if MICBn_RATE = 1 (pop-free

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