WM8321 datasheet(87/253 Pages) WOLFSON

87 / 253 page

Production Data

WM8321

PD, February 2012, Rev 4.0

ADDRESS

BIT

LABEL

DESCRIPTION

Default value is 1 (masked)

Notes:

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

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

Table 39 Power Management Interrupts

15.13 POWER GOOD INDICATION

The WM8321 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 40.

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 WM8321 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.

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