WM8351 datasheet(133/330 Pages) WOLFSON

133 / 330 page

Production Data

WM8351

PD, April 2012, Rev 4.5

133

The DC-DC Converters and the LDO Regulators have a first-level interrupt, UV_INT (see Section 24).

This comprises second-level interrupts from each of the DC-DC Converters and the LDO Regulators.

Each DC-DC Converter has a dedicated second-level interrupt which indicates an under-voltage

condition. These can be masked by setting the applicable mask bit as defined in Table 80.

ADDRESS

BIT

LABEL

DESCRIPTION

R28 (1Ch)

Under Voltage

Interrupt Status

UV_DC4_EINT

DCDC4 Under-voltage interrupt.

(Rising Edge triggered)

Note: This bit is cleared once read.

UV_DC3_EINT

DCDC3 Under-voltage interrupt.

(Rising Edge triggered)

Note: This bit is cleared once read.

UV_DC2_EINT

DCDC2 Under-voltage interrupt.

(Rising Edge triggered)

Note: This bit is cleared once read.

UV_DC1_EINT

DCDC1 Under-voltage interrupt.

(Rising Edge triggered)

Note: This bit is cleared once read.

R36 (24h)

Under Voltage

Interrupt Mask

as in

R28

“IM_” + name of respective

bit in R28

Mask bits for DC-DC converter under-

voltage interrupts

Each of these bits masks the respective

bit in R28 when it is set to 1 (e.g.

UV_DC1_EINT in R28 does not trigger a

UV_INT interrupt when IM_UV_DC1_EINT

in R36 is set).

Note:

there is no over-current fault condition for converter 2.

Table 80 DC-DC Converter Interrupts

The status of the DC-DC Converters 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 81 determine which of the DC-DCs contribute to the /VCC_FAULT indication. An

undervoltage or overvoltage condition on any unmasked DC-DC Converter will cause the

/VCC_FAULT output to be set to logic low.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R215 (D7h)

VCC_FAULT

DC4_FAULT

DCDC4 fault mask for the /VCC_FAULT

0 = don't mask converter fault

1 = mask converter fault

DC3_FAULT

DCDC3 fault mask for the /VCC_FAULT

0 = don't mask converter fault

1 = mask converter fault

DC2_FAULT

DCDC2 fault mask for the /VCC_FAULT

0 = don't mask converter fault

1 = mask converter fault

DC1_FAULT

DCDC1 fault mask for the /VCC_FAULT

0 = don't mask converter fault

1 = mask converter fault

Table 81 DC Converter /VCCFAULT Mask Bits

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