WM9090ECSSLASHR datasheet(41/81 Pages) WOLFSON

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Production Data

WM9090

PD, November 2010, Rev 4.1

The following default control sequences are provided:

Headphone Start-Up - This sequence powers up the headphone driver and charge pump. It

commands the DC Servo to perform offset correction. This sequence is intended for enabling

the headphone output after initial power-on, when DC offset correction has not previously been

run.

Generic Shut-Down - This sequence shuts down all of the WM9090 output drivers, DC Servo

and charge pump circuits.

Specific details of these sequences are provided below. Note that the timings noted are typical

values only.

Headphone Start-Up

The Headphone 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 21.

This sequence takes approximately 40ms to run.

WSEQ

INDEX

ADDRESS

WIDTH

START

DATA

DELAY

EOS

DESCRIPTION

0 (00h)

R76 (4Ch)

1 bit

Bit 15

01h

CP_ENA = 1

(delay = 4.5ms)

1 (01h)

R1 (01h)

3 bits

Bit 7

07h

HPOUT1R_ENA = 1

HPOUT1L_ENA = 1

(delay = 0.5ms)

2 (02h)

R96 (60h)

5 bits

Bit 1

11h

HPOUT1R_DLY = 1

HPOUT1L_DLY = 1

(delay = 0.5ms)

3 (03h)

R84 (54h)

7 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 = 32.5ms)

4 (04h)

R255 (FFh)

1 bit

Bit 0

00h

Dummy Write for additional delay

(delay = 2.5ms)

5 (05h)

R255 (FFh)

1 bit

Bit 0

00h

Dummy Write for expansion

(delay = 0.5ms)

6 (06h)

R255 (FFh)

1 bits

Bit 0

00h

Dummy Write for expansion

(delay = 0.5ms)

7 (07h)

R96 (60h)

6 bits

Bit 2

3Bh

HPOUT1L_RMV_SHORT = 1

HPOUT1L_OUTP = 1

HPOUT1R_RMV_SHORT =1

HPOUT1R_OUTP = 1

(delay = 0.5ms)

Table 21 Headphone Start-Up Default Sequence

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