Production Data
WM8321
ADDRESS
BIT
LABEL
DESCRIPTION
Default value is 1 (masked)
Notes:
1. n is a number between 1 and 10 that identifies the individual LDO Regulator (LDO1 - 10).
2. m 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.
PD, February 2012, Rev 4.0
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
