WM8311 datasheet(39/302 Pages) WOLFSON

39 / 302 page

Pre-Production

WM8311

PP, May 2012, Rev 3.1

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

OFF_SW_REQ

Most recent OFF event type

0 = Not caused by software OFF

1 = Caused by software OFF

command (CHIP_ON = 0)

OFF_ON_PIN

Most recent OFF event type

0 = Not caused by the ON pin

1 = Caused by the ON pin

Table 2 Power State Control Registers

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

Touch Panel pen down

Requires the Touch Panel to be configured to

generate WAKE request. See Section 19.

ON_PEN_DOWN

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

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