WM8993 datasheet(148/229 Pages) WOLFSON

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WM8993

Production Data

PD, November 2010, Rev 4.0

148

Line Output Start-Up

The Line Output Start-Up sequence can be initiated by writing 0119h to Register 73 (49h). This single

operation starts the Control Write Sequencer at Index Address 25 (19h) and executes the sequence

defined in Table 99.

This sequence takes approximately 517ms to run.

WSEQ

INDEX

ADDRESS

WIDTH

START

DATA

DELAY

EOS

DESCRIPTION

25 (19h)

R56 (38h)

2 bits

Bit 4

03h

LINEOUT2_DISCH = 1

LINEOUT1_DISCH = 1

(delay = 0.5625ms)

26 (1Ah)

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)

27 (1Bh)

R56 (38h)

1 bit

Bit 7

01h

LINEOUT_VMID_BUF_ENA = 1

(delay = 0.5625ms)

28 (1Ch)

R3 (03h)

4 bits

Bit 10

0Fh

LINEOUT2P_ENA = 1

LINEOUT2N_ENA = 1

LINEOUT1P_ENA = 1

LINEOUT1N_ENA = 1

(delay = 0.5625ms)

29 (1Dh)

R56 (38h)

2 bits

Bit 4

00h

LINEOUT2_DISCH = 0

LINEOUT1_DISCH = 0

(delay = 0.5625ms)

30 (1Eh)

R1 (01h)

3 bits

Bit 0

03h

BIAS_ENA = 1

VMID_SEL = 01b

(delay = 0.5625ms)

31 (1Fh)

R57 (39h)

1 bit

Bit 1

00h

BIAS_SRC = 0

(delay = 512.5ms)

32 (20h)

R30 (1Eh)

2 bits

Bit 5

00h

LINEOUT1P_MUTE = 0

LINEOUT1N_MUTE = 0

(delay = 0.5625ms)

33 (21h)

R30 (1Eh)

2 bits

Bit 1

00h

LINEOUT2P_MUTE = 0

LINEOUT2N_MUTE = 0

(delay = 0.5625ms)

Table 99 Line Output Start-Up Default Sequence

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