WM8993 datasheet(147/229 Pages) WOLFSON

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Production Data

WM8993

PD, November 2010, Rev 4.0

147

Speaker Start-Up

The Speaker Start-Up sequence can be initiated by writing 0110h to Register 73 (49h). This single

operation starts the Control Write Sequencer at Index Address 16 (10h) and executes the sequence

defined in Table 97.

This sequence takes approximately 34ms to run.

WSEQ

INDEX

ADDRESS

WIDTH

START

DATA

DELAY

EOS

DESCRIPTION

16 (10h)

R57 (39h)

5 bits

Bit 2

1Bh

STARTUP_BIAS_ENA = 1

VMID_BUF_ENA = 1

VMID_RAMP[1:0] = 11b

(delay = 0.5625ms)

17 (11h)

R1 (01h)

3 bits

Bit 0

03h

BIAS_ENA = 1

VMID_SEL[1:0] = 01b

(delay = 32.5ms)

18 (12h)

R1 (01h)

2 bits

Bit 12

03h

SPKOUTL_ENA = 1

SPKOUTR_ENE = 1

(delay = 0.5625ms)

Table 97 Speaker Start-Up Default Sequence

Earpiece Start-Up

The Earpiece Start-Up sequence can be initiated by writing 0113h to Register 73 (49h). This single

operation starts the Control Write Sequencer at Index Address 19 (13h) and executes the sequence

defined in Table 98.

This sequence takes approximately 259ms to run.

WSEQ

INDEX

ADDRESS

WIDTH

START

DATA

DELAY

EOS

DESCRIPTION

19 (13h)

R57 (39h)

6 bits

Bit 1

27h

BIAS_SRC = 1

STARTUP_BIAS_ENA = 1

VMID_BUF_ENA = 1

VMID_RAMP[1:0] = 10b

(delay = 0.5625ms)

20 (14h)

R56 (38h)

1 bit

Bit 6

01h

HPOUT2_IN_ENA = 1

(delay = 0.5625ms)

21 (15h)

R1 (01h)

1 bit

Bit 11

01h

HPOUT2_ENA = 1

(delay = 0.5625ms)

22 (16h)

R1 (01h)

3 bits

Bit 0

03h

BIAS_ENA = 1

VMID_SEL[1:0] = 01b

(delay = 256.5ms)

23 (17h)

R57 (39h)

1 bit

Bit 1

00h

BIAS_SRC = 0

(delay = 0.5625ms)

24 (18h)

R31 (1Fh)

1 bit

Bit 5

00h

HPOUT2_MUTE = 0

(delay = 0.5625ms)

Table 98 Earpiece Start-Up Default Sequence

WM8993 Datasheet(PDF) 147 Page - Wolfson Microelectronics plc

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