WM8993 datasheet(154/229 Pages) WOLFSON

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WM8993

Production Data

PD, November 2010, Rev 4.0

154

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R57 (39h)

AntiPOP2

6:5

VMID_RAMP [1:0]

VMID soft start enable / slew rate

control

00 = Normal / Slow start

01 = Normal / Fast start

10 = Soft / Slow start

11 = Soft / Fast soft start

STARTUP_BIAS_

ENA

Enables the Start-Up bias current

generator

0 = Disabled

1 = Enabled

BIAS_SRC

Selects the bias current source

0 = Normal bias

1 = Start-Up bias

Table 107 Soft Start Control

POWER MANAGEMENT

The WM8993 has four control registers that allow users to select which functions are active. For

minimum power consumption, unused functions should be disabled. To minimise pop or click noise,

it is important to enable or disable functions in the correct order. See “Control Write Sequencer” for

further details of recommended control sequences.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R1 (1h)

Power

Management

(1)

SPKOUTR_ENA

SPKMIXR Mixer, SPKRVOL PGA and

SPKOUTR Output Enable

0 = Disabled

1 = Enabled

SPKOUTL_ENA

SPKMIXL Mixer, SPKLVOL PGA and

SPKOUTL Output Enable

0 = Disabled

1 = Enabled

HPOUT2_ENA

HPOUT2 and HPOUT2MIX Enable

0 = Disabled

1 = Enabled

HPOUT1L_ENA

Enables HPOUT1L input stage

0 = Disabled

1 = Enabled

For normal operation, this bit should be

set as the first step of the HPOUT1L

Enable sequence.

Note: When HPOUT1_AUTO_PU is set,

the HPOUT1L_ENA bit automatically

enables all stages of the left headphone

driver

HPOUT1R_ENA

Enables HPOUT1R input stage

0 = Disabled

1 = Enabled

For normal operation, this bit should be

set as the first step of the HPOUT1R

Enable sequence.

Note: When HPOUT1_AUTO_PU is set,

the HPOUT1R_ENA bit automatically

enables all stages of the right headphone

driver

WM8993 Datasheet(PDF) 154 Page - Wolfson Microelectronics plc

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