WM8310 datasheet(91/291 Pages) CIRRUS

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Pre-Production

WM8310

PP, May 2012, Rev 3.1

ADDRESS

BIT

LABEL

DESCRIPTION

Default value is 1 (masked)

R16412

(401Ch)

Interrupt Status

4 Mask

IM_HC_DC2_EINT

Interrupt mask.

0 = Do not mask interrupt.

1 = Mask interrupt.

Default value is 1 (masked)

IM_HC_DC1_EINT

Interrupt mask.

0 = Do not mask interrupt.

1 = Mask interrupt.

Default value is 1 (masked)

3:0

IM_UV_DCm_EINT

Interrupt mask.

0 = Do not mask interrupt.

1 = Mask interrupt.

Default value is 1 (masked)

Notes:

n is a number between 1 and 10 that identifies the individual LDO Regulator (LDO1 - 10).

m is a number between 1 and 4 that identifies the individual DC-DC Converter (DC-DC1 - 4).

Table 43 Power Management Interrupts

15.14 POWER GOOD INDICATION

The WM8310 can indicate the status of the DC-DC Converters and LDO Regulators via a GPIO pin

configured as a “PWR_GOOD” output (see Section 21).

Each DC-DC Converter and LDO Regulator to be monitored in this way must be individually enabled

as an input to the PWR_GOOD function using the register bits defined in Table 44.

When a GPIO pin is configured as a “PWR_GOOD” output, this signal is asserted when all selected

DC-DC Converters and LDO Regulators are operating correctly. If any of the enabled DC-DC

Converters or LDO Regulators is undervoltage, then the PWR_GOOD will be de-asserted. In this

event, the host processor should read the Undervoltage Interrupt fields to determine which DC-DC

Converter or LDO Regulator is affected.

Note that an Undervoltage condition may lead to a Converter being switched off automatically. In this

case, the disabled Converter will not indicate the fault condition via PWR_GOOD. Accordingly, the

PWR_GOOD signal may not be a reliable output in cases where the WM8310 is configured to shut

down any Converters automatically under Undervoltage conditions. It is recommended that the host

processor should read the Undervoltage Interrupts in response to PWR_GOOD being de-asserted.

The host processor can then initiate the most appropriate response.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R16526 (408Eh)

Power Good

Source 1

DC4_OK

DC-DC4 status selected as an input

to PWR_GOOD

0 = Disabled

1 = Enabled

DC3_OK

DC-DC3 status selected as an input

to PWR_GOOD

0 = Disabled

1 = Enabled

DC2_OK

DC-DC2 status selected as an input

to PWR_GOOD

0 = Disabled

1 = Enabled

DC1_OK

DC-DC1 status selected as an input

to PWR_GOOD

0 = Disabled

1 = Enabled

R16527 (408Fh)

LDO10_OK

LDO10 status selected as an input to

PWR_GOOD

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