WM8903 datasheet(135/178 Pages) WOLFSON

135 / 178 page

Production Data

WM8903

PD, Rev 4.5, June 2012

135

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

4:3

VMID_SOFT

[1:0]

VMID soft start enable / slew rate control

00 = Disabled

01 = Fast soft start

10 = Nominal soft start

11 = Slow soft start

2:1

VMID_RES [1:0]

VMID Divider Enable and Select

00 = VMID disabled (for OFF mode)

01 = 2 x 50k divider (for normal operation)

10 = 2 x 250k divider (for low power standby)

11 = 2 x 5k divider (for fast start-up)

VMID_BUF_ENA

VMID Buffer Enable

0 = Disabled

1 = Enabled

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R6 (06h) Mic

Bias Control

5:4

MICDET_THR [1:0]

MICBIAS Current Detect Insertion Threshold

00 = 0.063mA

01 = 0.26mA

10 = 0.45mA

11 = 0.635mA

Values are scaled with AVDD. Figures shown are

based on AVDD=1.8V.

3:2

MICSHORT_THR

[1:0]

MICBIAS Short Circuit Button Push Threshold

00 = 0.52mA

01 = 0.77mA

10 = 1.2mA

11 = 1.43mA

Values are scaled with AVDD. Figures shown are

based on AVDD=1.8V.

MICDET_ENA

MICBIAS Current and Short Circuit Detect Enable

0 = disabled

1 = enabled

MICBIAS_ENA

MICBIAS Enable

0 = disabled

1 = enabled

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R8 (08h)

Analogue

DAC 0

DAC_BIAS_BOOST

DAC Bias boost

0 = Disable

1 = Enable

When DAC Bias boost is enabled, the bias

selected by DACBIAS_SEL and

DACVMID_BIAS_SEL are both doubled.

4:3

DACBIAS_SEL [1:0]

DAC bias current select

00 = Normal bias

01 = Normal bias x 0.5

10 = Normal bias x 0.66

WM8903 Datasheet(PDF) 135 Page - Wolfson Microelectronics plc

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