WM8311 datasheet(78/302 Pages) WOLFSON

78 / 302 page

WM8311

Pre-Production

PP, May 2012, Rev 3.1

The Enable and Status register bits for the External Power Enable (EPE) Controls are defined in

Table 35.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R16464 (4050h)

DCDC Enable

EPE2_ENA

EPE2 Enable request

0 = Disabled

1 = Enabled

(Note that the actual status is indicated

in EPE2_STS)

EPE1_ENA

EPE1 Enable request

0 = Disabled

1 = Enabled

(Note that the actual status is indicated

in EPE1_STS)

R16466 (4052h)

DCDC Status

EPE2_STS

EPE2 Status

0 = Disabled

1 = Enabled

EPE1_STS

EPE1 Status

0 = Disabled

1 = Enabled

Table 35 External Power Enable (EPE) Control

15.12.2 DC-DC SYNCHRONOUS BUCK CONVERTER CONTROL

The register controls for configuring the DC-DC synchronous buck converters 1-3 are defined in Table

36.

Note that the DCm_ON_SLOT fields and the 5 MSBs of DCm_ON_VSEL may also be stored in the

integrated OTP memory. See Section 14 for details.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R16470 (4056h)

DC1 Control 1

15:14

DC1_RATE

[1:0]

DC-DC1 Voltage Ramp rate

00 = 1 step every 32us

01 = 1 step every 16us

10 = 1 step every 8us

11 = Immediate voltage change

DC1_PHASE

DC-DC1 Clock Phase Control

0 = Normal

1 = Inverted

9:8

DC1_FREQ

[1:0]

DC-DC1 Switching Frequency

00 = Reserved

01 = 2.0MHz

10 = Reserved

11 = 4.0MHz

DC1_FLT

DC-DC1 Output float

0 = DC-DC1 output discharged when

disabled

1 = DC-DC1 output floating when

disabled

5:4

DC1_SOFT_

START [1:0]

DC-DC1 Soft-Start Control

(Duration in each of the 8 startup current

limiting steps.)

00 = 32us steps

01 = 64us steps

10 = 128us steps

11 = 256us steps

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