WM8993 datasheet(149/229 Pages) WOLFSON

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Production Data

WM8993

PD, November 2010, Rev 4.0

149

Speaker and Headphone Fast Shut-Down

The Speaker and Headphone Fast Shut-Down sequence can be initiated by writing 0122h to Register

73 (49h). This single operation starts the Control Write Sequencer at Index Address 34 (22h) and

executes the sequence defined in Table 100.

This sequence takes approximately 37ms to run.

WSEQ

INDEX

ADDRESS

WIDTH

START

DATA

DELAY

EOS

DESCRIPTION

34 (22h)

R96 (60h)

7 bits

Bit 1

00h

HPOUT1R_DLY = 0

HPOUT1R_OUTP = 0

HPOUT1R_RMV_SHORT = 0

HPOUT1L_DLY = 0

HPOUT1L_OUTP = 0

HPOUT1L_RMV_SHORT = 0

(delay = 0.5625ms)

35 (23h)

R84 (54h)

2 bits

Bit 0

00h

DCS_ENA_CHAN_0 = 0

DCS_ENA_CHAN_1 = 0

(delay = 0.5625ms)

36 (24h)

R1 (01h)

2 bits

Bit 8

00h

HPOUT1R_ENA = 0

HPOUT1L_ENA = 0

(delay = 0.5625ms)

37 (25h)

R76 (4Ch)

1 bit

Bit 15

00h

CP_ENA = 0

(delay = 0.5625ms)

38 (26h)

R1 (01h)

2 bits

Bit 12

00h

SPKOUTL_ENA = 0

SPKOUTR_ENA = 0

(delay = 0.5625ms)

39 (27h)

R57 (39h)

6 bits

Bit 1

37h

BIAS_SRC = 1

STARTUP_BIAS_ENA = 1

VMID_BUF_ENA = 1

VMID_RAMP[1:0] = 11b

(delay = 0.5625ms)

40 (28h)

R1 (01h)

3 bits

Bit 0

00h

BIAS_ENA = 0

VMID_SEL = 00b

(delay = 32.5ms)

41 (29h)

R57 (39h)

6 bits

Bit 1

00h

BIAS_SRC = 0

STARTUP_BIAS_ENA = 0

VMID_BUF_ENA = 0

VMID_RAMP[1:0] = 00b

(delay = 0.5625ms)

Table 100 Speaker and Headphone Fast Shut-Down Default Sequence

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