WM8310 datasheet(36/291 Pages) CIRRUS

36 / 291 page

WM8310

Pre-Production

PP, May 2012, Rev 3.1

Table 3 lists all of the events which can trigger an ON, WAKE, OFF or SLEEP transition sequence. It

also lists the associated status bits of the ‘ON Source’ and ‘OFF Source’ register bits which are

asserted under each condition.

TRANSITION

SEQUENCE

EVENT

NOTES

ON SOURCE /

OFF SOURCE

ON (see note 1)

RTC alarm

An ON request occurs if the RTC Alarm occurs

in the OFF power state. See Section 20.

ON_TRANS, ON_RTC_ALM

GPIO ON request

Requires a GPIO to be configured as “Power

On request” or “Power On/Off request”. See

Section 21.

ON_TRANS, ON_GPIO

¯¯ pin request

Requires the ON

¯¯ pin to be configured to

generate ON request. See Section 11.6.

ON_TRANS, ON_ON_PIN

WAKE

Software WAKE

Writing CHIP_SLP = 0. See Table 2.

ON_SW_REQ

Battery Charger event

Occurs when a Charger Interrupt event is

triggered. See Section 17.7.8.

ON_CHG

Watchdog timeout

Requires the Watchdog to be configured to

generate WAKE request. See Section 25.

ON_WDOG_TO

RTC alarm

A WAKE request occurs if the RTC Alarm

occurs in the SLEEP power state. See

Section 20.

ON_RTC_ALM

GPIO WAKE request

Requires a GPIO to be configured as

“Sleep/Wake request”. See Section 21.

ON_GPIO

SYSVDD undervoltage

Requires the SYSVDD monitor circuit to be

configured to generate WAKE request. See

Section 24.4.

ON_SYSLO

¯¯ pin request

Requires the ON

¯¯ pin to be configured to

generate WAKE request. See Section 11.6.

ON_ON_PIN

OFF (see note 2)

Watchdog timeout

Requires the Watchdog to be configured to

generate Device Reset. See Section 25.

RESET_WDOG

(See note 3)

Hardware Reset

See Section 24.

RESET_HW

(See note 3)

Software Reset

See Section 24.

RESET_SW

(See note 3)

Power Management

Undervoltage Reset

Configurable option for each LDO/DC-DC

converter. See Section 15.

RESET_CNV_UV

(See note 3)

Software OFF request

Writing CHIP_ON = 0. See Table 2.

OFF_SW_REQ

ON pin request

Requires the ON

¯¯ pin to be configured to

generate OFF request. See Section 11.6.

OFF_ON_PIN

Thermal shutdown

See Section 26.

OFF_THERR

SYSVDD undervoltage

Requires the SYSVDD monitor circuit to be

configured to generate OFF request. See

Section 24.4.

OFF_SYSVDD

SYSVDD shutdown

SYSVDD has fallen below the SHUTDOWN

threshold. See Section 24.4.

OFF_SYSVDD

GPIO OFF request

Requires a GPIO to be configured as “Power

On/Off request”. See Section 21.

OFF_GPIO

Power Sequence failure

DC-DC converters, LDOs or CLKOUT circuits

(including FLL) have failed to start up within the

permitted time.

OFF_PWR_SEQ

Internal LDO error

Error condition detected in LDO13

OFF_INTLDO_ERR

SLEEP

Software SLEEP request

Writing CHIP_SLP = 1. See Table 2.

See note 4 and note 5

GPIO SLEEP request

Requires a GPIO to be configured as “Sleep

request” or “Sleep/Wake request”. See

Section 21.

See note 4 and note 5

Table 3 Power State Transition Events

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