WM5102 datasheet(180/334 Pages) WOLFSON

180 / 334 page

WM5102

Production Data

PD, June 2014, Rev 4.2

180

The control registers associated with the MICDET Clamp function are described in Table 75.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R674

(02A2h)

Micd Clamp

control

3:0

MICD_CLAMP_M

ODE [3:0]

0000

MICDET Clamp Mode

0h = Disabled

1h = Active (MICDET1 and MICDET2

are shorted to GND)

2h = Reserved

3h = Reserved

4h = Active when JD1=0

5h = Active when JD1=1

6h = Active when GP5=0

7h = Active when GP5=1

8h = Active when JD1=0 or GP5=0

9h = Active when JD1=0 or GP5=1

Ah = Active when JD1=1 or GP5=0

Bh = Active when JD1=1 or GP5=1

Ch = Active when JD1=0 and GP5=0

Dh = Active when JD1=0 and GP5=1

Eh = Active when JD1=1 and GP5=0

Fh = Active when JD1=1 and GP5=1

R3413

(0D55h)

AOD IRQ

Raw Status

MICD_CLAMP_S

MICDET Clamp status

0 = Clamp not active

1 = Clamp active

Note that the MICDET Clamp is

effective on MICDET1 and MICDET2,

regardless of the ACCDET_SRC

R3414

(0D56h)

Jack detect

debounce

MICD_CLAMP_D

MICDET Clamp de-bounce

0 = Disabled

1 = Enabled

Table 75 MICDET Clamp Control

MICROPHONE DETECT

The WM5102 microphone detection circuit measures the impedance of an external load connected to

one of the MICDET pins. This feature can be used to detect the presence of a microphone, and the

status of the associated hookswitch. It can also be used to detect push-button status or the

connection of other external accessories.

The microphone detection circuit measures the impedance connected to MICDET1 or MICDET2, and

reports whether the measured impedance lies within one of 8 pre-defined levels (including the ‘no

accessory detected’ level). This means it can detect the presence of a typical microphone and up to 6

push-buttons. One of the impedance levels is specifically designed to detect a video accessory

(typical 75Ω) load if required.

The microphone detection circuit typically uses one of the MICBIAS outputs as a reference. The

WM5102 will automatically enable the appropriate MICBIAS when required in order to perform the

detection function; this allows the detection function to be supported in low-power standby operating

conditions.

Note that the MICVDD power domain must be enabled when using the microphone detection function.

This power domain is provided using an internal Charge Pump (CP2) and LDO Regulator (LDO2).

See “Charge Pumps, Regulators and Voltage Reference” for details of these circuits.

To select microphone detection on one of the MICDET pins, the ACCDET_MODE register must be set

to 00. The ACCDET_MODE register is defined in Table 76.

WM5102 Datasheet(PDF) 180 Page - Wolfson Microelectronics plc

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