WM8281ECSSLASHR datasheet(311/392 Pages) CIRRUS

311 / 392 page

WM8281

Rev 4.0

311

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

MICB3_ENA

Microphone Bias 3 Enable

0 = Disabled

1 = Enabled

R715

(02CBh)

Isolation

control

ISOLATE_DCVD

Always-On power domain isolate control

Set this bit to 1 to isolate the ‘Always-On’

domain from the DCVDD pin.

If DCVDD is powered externally (not from

LDO1), this bit must be set before

selecting Sleep mode (ie. before removing

the external DCVDD supply).

If DCVDD is powered from LDO1, then

there is no requirement to set this bit.

This bit is automatically reset to 0

following a Wake-up transition (from Sleep

mode).

R3104

(0C20h)

Misc Pad

Ctrl 1

LDO1ENA_PD

LDOENA Pull-Down Control

0 = Disabled

1 = Enabled

Note - when LDO1ENA_PD and

LDO1ENA_PU are both set to ‘1’, then a

‘bus keeper’ function is enabled on the

LDOENA pin.

LDO1ENA_PU

LDOENA Pull-Up Control

0 = Disabled

1 = Enabled

Note - when LDO1ENA_PD and

LDO1ENA_PU are both set to ‘1’, then a

‘bus keeper’ function is enabled on the

LDOENA pin.

Table 125 Charge Pump and LDO Control Registers

LDO2_VSEL [5:0]

LDO OUTPUT

LDO2_VSEL [5:0]

LDO OUTPUT

LDO2_VSEL [5:0]

LDO OUTPUT

00h

0.900V

10h

1.300V

20h

2.600V

01h

0.925V

11h

1.325V

21h

2.700V

02h

0.950V

12h

1.350V

22h

2.800V

03h

0.975V

13h

1.375V

23h

2.900V

04h

1.000V

14h

1.400V

24h

3.000V

05h

1.025V

15h

1.500V

25h

3.100V

06h

1.050V

16h

1.600V

26h

3.200V

07h

1.075V

17h

1.700V

27h

3.300V

08h

1.100V

18h

1.800V

28h to 3Fh

3.300V

09h

1.125V

19h

1.900V

0Ah

1.150V

1Ah

2.000V

0Bh

1.175V

1Bh

2.100V

0Ch

1.200V

1Ch

2.200V

0Dh

1.225V

1Dh

2.300V

0Eh

1.250V

1Eh

2.400V

0Fh

1.275V

1Fh

2.500V

Table 126 LDO2 Voltage Control

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