WM8994ECSSLASHR datasheet(235/363 Pages) CIRRUS

235 / 363 page

WM8994

Rev 4.6

235

POWER MANAGEMENT

The WM8994 has 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

“Control Write Sequencer” for details

of recommended control sequences.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R1 (0001h)

Power

Management

(1)

SPKOUTR_ENA

SPKMIXR Mixer, SPKRVOL PGA and

SPKOUTR Output Enable

0 = Disabled

1 = Enabled

SPKOUTL_ENA

SPKMIXL Mixer, SPKLVOL PGA and

SPKOUTL Output Enable

0 = Disabled

1 = Enabled

HPOUT2_ENA

HPOUT2 and HPOUT2MIX Enable

0 = Disabled

1 = Enabled

HPOUT1L_ENA

Enables HPOUT1L input stage

0 = Disabled

1 = Enabled

HPOUT1R_ENA

Enables HPOUT1R input stage

0 = Disabled

1 = Enabled

MICB2_ENA

Microphone Bias 2 Enable

0 = Disabled

1 = Enabled

MICB1_ENA

Microphone Bias 1 Enable

0 = Disabled

1 = Enabled

2:1

VMID_SEL

[1:0]

VMID Divider Enable and Select

00 = VMID disabled (for OFF mode)

01 = 2 x 40k

 divider (Normal mode)

10 = 2 x 240k

 divider (Standby mode)

11 = Reserved

BIAS_ENA

Enables the Normal bias current

generator (for all analogue functions)

0 = Disabled

1 = Enabled

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