WM8993 datasheet(145/229 Pages) WOLFSON

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Production Data

WM8993

PD, November 2010, Rev 4.0

145

Headphone Cold Start-Up

The Headphone Cold Start-Up sequence is initiated by writing 0100h to Register 73 (49h). This

single operation starts the Control Write Sequencer at Index Address 0 (00h) and executes the

sequence defined in Table 95.

This sequence takes approximately 296ms to run.

WSEQ

INDEX

ADDRESS

WIDTH

START

DATA

DELAY

EOS

DESCRIPTION

0 (00h)

R57 (39h)

5 bits

Bit 2

1Bh

STARTUP_BIAS_ENA = 1

VMID_BUF_ENA = 1

VMID_RAMP[1:0] = 11b

(delay = 0.5625ms)

1 (01h)

R1 (01h)

3 bits

Bit 0

03h

BIAS_ENA = 1

VMID_SEL[1:0] = 01b

(delay = 32.5ms)

2 (02h)

R76 (4Ch)

1 bits

Bit 15

01h

CP_ENA = 1

(delay = 4.5ms)

3 (03h)

R1 (01h)

3 bits

Bit 7

07h

HPOUT1R_ENA = 1

HPOUT1L_ENA = 1

(delay = 0.5625ms)

4 (04h)

R96 (60h)

5 bits

Bit 1

11h

HPOUT1R_DLY = 1

HPOUT1L_DLY = 1

(delay = 0.5625ms)

5 (05h)

R84 (54h)

6 bits

Bit 0

33h

DCS_ENA_CHAN_0 = 1

DCS_ENA_CHAN_1 = 1

DCS_TRIG_STARTUP_0 = 1

DCS_TRIG_STARTUP_1 = 1

(delay = 256.5ms)

6 (06h)

R255 (FFh)

1 bits

Bit 0

00h

Dummy Write for expansion

(delay = 0.5625ms)

7 (07h)

R96 (60h)

6 bits

Bit 2

3Bh

HPOUT1R_OUTP = 1

HPOUT1R_RMV_SHORT =1

HPOUT1_DLY = 1

HPOUT1L_OUTP = 1

HPOUT1L_RMV_SHORT = 1

(delay = 0.5625ms)

Table 95 Headphone Cold Start-Up Default Sequence

WM8993 Datasheet(PDF) 145 Page - Wolfson Microelectronics plc

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