WM8351 datasheet(135/330 Pages) WOLFSON

135 / 330 page

Production Data

WM8351

PD, April 2012, Rev 4.5

135

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R207 (CFh)

for LDO3

R210 (D2h)

for LDO4

1111 = Start up on entering ACTIVE

9:6

LDOn_SDSL

OT [3:0]

0000

Time slot for LDOn shutdown.

0000 = Shut down on entering OFF

0001 = Shutdown in time slot 1

…. (total 14 slots available)

1110 = Shutdown in time slot 14

1111 = Shut down on entering OFF

Note: n

is a number between 1 and 4 that identifies the individual LDO regulator

Table 82 Enabling and Disabling the LDO Regulators

14.7.2

LDO REGULATOR CONTROL

The LDO Regulators can be configured to operate in different modes using the register bits described

in Table 83.

In Switch mode, the Regulators operate as current-limited switches with no voltage regulation.

In LDO Regulator mode, the Regulators generate an output voltage determined by the LDOn_VSEL

fields. The LDO Regulators are dynamically programmable - the output voltage may be adjusted in

software at any time. The Regulators are critically damped to ensure there is no voltage overshoot or

undershoot when adjusting the output voltage.

The default output voltage for the LDO Regulators is set by writing to the LDOn_VSEL register bits.

The ‘image’ voltage settings LDOn_VIMG are alternate values that may be invoked when the

HIBERNATE software or hardware control is asserted.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R200 (C8h)

for LDO1

R203 (CBh)

for LDO2

R206 (CEh)

for LDO3

R209 (D1h)

for LDO4

LDOn_SWI

LDOn Regulator mode

0 = LDO voltage regulator

1 = Current-limited switch (no voltage

regulation, LDOn_VSEL has no

effect)

4:0

LDOn_VSEL

[4:0]

Dependant on

CONFIG[1:0]

settings

LDOn Regulator output voltage (when

LDOn_SWI=0)

1 1111 = 3.3V

… (100mV steps)

1 0000 = 1.8V

0 1111 = 1.65V

… (50mV steps)

0 0000 = 0.9V

R202 (CAh)

for LDO1

R205 (CDh)

for LDO2

R208 (D0h)

for LDO3

R211 (D3h)

for LDO4

4:0

LDOn_VIMG

[4:0]

1 1100

LDOn Regulator output image voltage

1 1111 = 3.3V

… (100mV steps)

1 0000 = 1.8V

0 1111 = 1.65V

… (50mV steps)

0 0000 = 0.9V

Note: n

is a number between 1 and 4 that identifies the individual LDO regulator

Table 83 Controlling Regulator Voltage and Switch Mode

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