WM9090ECSSLASHR datasheet(53/81 Pages) WOLFSON

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Production Data

WM9090

PD, November 2010, Rev 4.1

POWER MANAGEMENT

The WM9090 provides control registers that allow users to select which functions are active. For

minimum power consumption, unused functions should be disabled. To minimise pop or click noise,

it is important to enable or disable functions in the correct order. See “Power Sequences and Pop

Suppression Control” for further details of recommended control sequences.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R1 (1h)

Power

Management

(1)

SPKOUTL_ENA

Speaker Output Enable

0 = Disabled

1 = Enabled

HPOUT1L_ENA

Headphone Output (HPOUTL) input

stage enable

0 = Disabled

1 = Enabled

For pop-free operation, this bit should be

set as the first stage of the HPOUTL

Enable sequence.

HPOUT1R_ENA

Headphone Output (HPOUTR) input

stage enable

0 = Disabled

1 = Enabled

For pop-free operation, this bit should be

set as the first stage of the HPOUTR

Enable sequence.

2:1

VMID_RES

[1:0]

VMID Divider Enable and Select

00 = VMID disabled (for OFF mode)

01 = 2 x 50k divider (for normal

operation)

10 = 2 x 250k divider (for low power

standby)

11 = 2 x 5k divider (for fast start-up)

BIAS_ENA

Enables the Normal bias current

generator (for all analogue functions)

0 = Disabled

1 = Enabled

R2 (02h)

Power

Management

(2)

TSHUT_ENA

Thermal Sensor Enable

0 = Disabled

1 = Enabled

TSHUT_OPDIS

Thermal Shutdown Control

(Causes audio outputs to be disabled if

an over-temperature occurs. The thermal

sensor must also be enabled.)

0 = Disabled

1 = Enabled

IN1A_ENA

IN1A Input PGA Enable

0 = Disabled

1 = Enabled

IN1B_ENA

IN1B Input PGA Enable

0 = Disabled

1 = Enabled

(Note this is only required for single-

ended input on the IN1N pin)

IN2A_ENA

IN2A Input PGA Enable

0 = Disabled

1 = Enabled

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