WM8352 datasheet(139/336 Pages) WOLFSON

139 / 336 page

Production Data

WM8352

PD, February 2011, Rev 4.4

139

The status of the LDO Regulators can be indicated and monitored externally via a GPIO pin

configured as /VCC_FAULT (see Section 20). When a GPIO pin is configured as /VCC_FAULT

output, a logic low level on this pin indicates that there is a fault condition on one of the LDO

Regulators, DC-DC Converters, or the Current Limit switch.

The /VCC_FAULT output is configurable by the control fields in Register R215. The fields described

in Table 88 determine which of the LDOs contribute to the /VCC_FAULT indication. An undervoltage

or overvoltage condition on any unmasked LDO will cause the /VCC_FAULT output to be set to logic

low.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R215 (D7h)

VCC_FAULT

LDO4_FAULT

LDO4 fault mask for the /VCC_FAULT

0 = don't mask converter fault

1 = mask converter fault

LDO3_FAULT

LDO3 fault mask for the /VCC_FAULT

0 = don't mask converter fault

1 = mask converter fault

LDO2_FAULT

LDO2 fault mask for the /VCC_FAULT

0 = don't mask converter fault

1 = mask converter fault

LDO1_FAULT

LDO1 fault mask for the /VCC_FAULT

0 = don't mask converter fault

1 = mask converter fault

Table 88 LDO Regulator /VCCFAULT mask bits

14.7.4

ADDITIONAL CONTROL FOR LDO1

By default, all DC Converters and LDOs are disabled in the OFF state. Additional control is provided

to enable LDO1 to be configured differently, allowing it to be enabled in the OFF state, or else to be

controlled by a GPIO pin configured as /LDO_ENA (see Section 20.2.2). These options are selected

by setting the register fields described in Table 89. In practical applications, however, these options

are set by the Config Mode settings and are not set by users.

Operation of LDO1 in the OFF state is subject to the restriction that VOUT1 must be set to at least

1.8V.

CONDITION

DESCRIPTION

LDO1_PIN_MODE = 0

LDO1 controlled as normal via register bits

LDO1_PIN_MODE = 1

LDO1_PIN_EN = 0

LDO1 enabled at all times

LDO1_PIN_MODE = 1

LDO1_PIN_EN = 1

LDO1 controlled by /LDO_ENA only

Table 89 LDO1 Additional Control

Note that LDO1 is always disabled in BACKUP and ZERO states.

Note that, when LDO1_PIN_MODE = 1, then LDO1 only operates as determined by the LDO1_VSEL

field. The Hibernate settings are ignored under this configuration.

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