WM8352 datasheet(135/336 Pages) WOLFSON

135 / 336 page

Production Data

WM8352

PD, February 2011, Rev 4.4

135

14.7 CONFIGURING THE LDO REGULATORS

The configuration of the LDO Regulators is described in the following sections. Some of the control

fields form part of the Custom Mode configuration settings and therefore will not require to be set in

software in some applications.

14.7.1

LDO REGULATOR ENABLE

The LDO Regulators can be enabled in software using the register fields defined in Table 82. To

reduce supply in-rush current, individual regulators should be programmed to start in different time

slots within the start-up sequence.

In the WM8352 ACTIVE state, the LDO Regulators can be enabled in software using the LDOn_ENA

bits. Setting these bits whilst in the Pre-Active state (see Figure 65) will not immediately enable the

corresponding LDO Regulators; these bits will only become effective once the WM8352 has reached

the ACTIVE state.

Each Regulator may be programmed to switch on in a selected timeslot within the start-up sequence.

The WM8352 will set the LDOn_ENA field for any LDO Regulator that is enabled during the start-up

sequence. Note that setting the LDOn_ENSLOT fields in software is only relevant to the

Development Mode, as these fields are assigned preset values in each of the Custom Modes.

Each Regulator may be programmed to switch off in a selected timeslot within the shutdown

sequence. If a Regulator is not allocated to one of the 14 shutdown timeslots, it will be disabled when

the WM8352 enters the OFF state.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R13 (0Dh) or

R176 (B0h)

DC-DC / LDO

requested

LDO1_ENA

LDO1 enable

0 = disabled

1 = enabled

Note: internal conditions may prevent the

converter from actually switching on -

see DCDC/LDO Status register for actual

converter status.

LDO2_ENA

LDO2 enable

0 = disabled

1 = enabled

Note: internal conditions may prevent the

converter from actually switching on -

see DCDC/LDO Status register for actual

converter status.

LDO3_ENA

LDO3 enable

0 = disabled

1 = enabled

Note: internal conditions may prevent the

converter from actually switching on -

see DCDC/LDO Status register for actual

converter status.

LDO4_ENA

LDO4 enable

0 = disabled

1 = enabled

Note: internal conditions may prevent the

converter from actually switching on -

see DCDC/LDO Status register for actual

converter status.

Note: These bits can be accessed through R13 or through R176. Reading from or writing to either

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