WM1811A datasheet(136/328 Pages) WOLFSON

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WM1811A

Production Data

PD, November 2013, Rev 4.1

136

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R209

(00D1h)

Mic Detect 2

7:0

MICD_LVL_SEL

[7:0]

0111_

1111

Mic Detect Level Select

(enables Mic Detection in specific

impedance ranges)

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

[6] = Enable >475 ohm detection

[5] = Enable 326 ohm detection

[4] = Enable 152 ohm detection

[3] = Enable 77 ohm detection

[2] = Enable 47.6 ohm detection

[1] = Enable 29.4 ohm detection

[0] = Enable 14 ohm detection

Note that the impedance values

quoted assume that a microphone

(475ohm-30kohm) is also present on

the MICDET pin.

R210

(00D2h)

Mic Detect 3

10:2

MICD_LVL [8:0]

0_0000_

0000

Mic Detect Level

(indicates the measured impedance)

[8] = Not used

[7] = >475 ohm, <30k ohm

[6] = 326 ohm

[5] = 152 ohm

[4] = 77 ohm

[3] = 47.6 ohm

[2] = 29.4 ohm

[1] = 14 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 78 Microphone Detect Control

WM1811A Datasheet(PDF) 136 Page - Wolfson Microelectronics plc

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