WM8962B datasheet(40/295 Pages) WOLFSON

Part #	WM8962B

Description	Ultra-Low Power Stereo CODEC with Audio Enhancement DSP, 1W Stereo Class D Speaker Drivers and Ground Referenced Headphone Drivers

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Manufacturer	WOLFSON [Wolfson Microelectronics plc]

Direct Link	http://www.wolfsonmicro.com

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WM8962

40

Rev 4.3

REGISTER

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R48 (30h)

Additional

Control (4)

14:12

MICDET_THR [2:0]

000

MICBIAS Current Detect Threshold

(AVDD = 1.8V)

000 = 64uA

001 = 166uA

010 = 375uA

011 = 475uA

100 = 575uA

101 = 680uA

110 = 885uA

111 = 990uA

Note that the value scales with

AVDD. The value quoted is correct

for AVDD=1.8V.

11:10 MICSHORT_THR [1:0]

00

MICBIAS Short Circuit Threshold

(AVDD = 1.8V)

00 = 515uA

01 = 680uA

10 = 1050uA

11 = 1215uA

Note that the value scales with

AVDD. The value quoted is correct

for AVDD=1.8V.

9

MICDET_ENA

0

MICBIAS Current and Short Circuit

Detect Enable

0 = Disabled

1 = Enabled

7

MICDET_STS

0

MICBIAS Current Detection status

0 = Current Detect threshold not

exceeded

1 = Current Detect threshold

exceeded

6

MICSHORT_STS

0

MICBIAS Short Circuit status

0 = Short Circuit threshold not

exceeded

1 = Short Circuit threshold

exceeded

Table 3 MICBIAS Current Detect

MICBIAS CURRENT DETECT FILTERING

The function of the filtering is to ensure that AC current spikes caused by ambient noise conditions

near the microphone do not lead to incorrect signalling of the microphone insertion/removal status or

the microphone hookswitch status.

Digital filtering of the hookswitch status ensures that the MICBIAS Short Circuit detection event is only

signalled if the MICSHORT_THR threshold condition has been met for 10 consecutive measurements.

In a typical application, microphone insertion would be detected when the MICBIAS current exceeds

the Current Detect threshold set by MICDET_THR.

When the MICD_IRQ_POL interrupt polarity bit is set to 0, then microphone insertion detection will

cause the MICD_EINT interrupt status register to be set.

(See “Interrupts” for details of these register

bits.)

For detection of microphone removal, the MICD_IRQ_POL bit should be set to 1. When the

MICD_IRQ_POL interrupt polarity bit is set to 1, then microphone removal detection will cause the

MICD_EINT interrupt status register to be set.

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