WM8311 datasheet(40/302 Pages) WOLFSON

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WM8311

Pre-Production

PP, May 2012, Rev 3.1

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

Notes:

An ON sequence is only permitted when the supply voltage SYSVDD exceeds a programmable threshold VSYSOK. See

Section 24.4 for details of SYSVDD voltage monitoring.

Selected OFF events may be masked during Battery Charging using the CHG_OFF_MASK bit. This allows user-initiated OFF

events (Software OFF, ON pin request, GPIO OFF request) to be inhibited. See Section 17.7.2.

These Reset conditions result in an OFF transition followed by an ON transition. These events are recorded as Reset events in

the ‘ON Source’ register.

SLEEP transitions are not possible when any of the Battery Charger Interrupts is set. If any of the Battery Charger Interrupts is

asserted when a SLEEP transition is requested, then the transition will be unsuccessful and the WM8311 will remain in the ON

power state. See Section 17.7.8 for details of the Battery Charger Interrupts.

SLEEP events are not recorded in the ‘OFF Source’ register.

11.4 POWER STATE INTERRUPTS

Power State transitions are associated with a number of Interrupt event flags. Transitions to

BACKUP, SLEEP, ON or OFF states are indicated by the Interrupt bits described in Table 4. Each of

these secondary interrupts triggers a primary Power State Interrupt, PS_INT (see Section 23). This

can be masked by setting the mask bit(s) as described in Table 4.

ADDRESS

BIT

LABEL

DESCRIPTION

R16402

(4012h)

Interrupt Status

PS_POR_EINT

Power On Reset interrupt

(Rising Edge triggered)

Note: Cleared when a ‘1’ is written.

PS_SLEEP_OFF_EINT

SLEEP or OFF interrupt (Power state

transition to SLEEP or OFF states)

(Rising Edge triggered)

Note: Cleared when a ‘1’ is written.

PS_ON_WAKE_EINT

ON or WAKE interrupt (Power state

transition to ON state)

(Rising Edge triggered)

Note: Cleared when a ‘1’ is written.

R16410

(401Ah)

Interrupt Status

2 Mask

IM_PS_POR_EINT

Interrupt mask.

0 = Do not mask interrupt.

1 = Mask interrupt.

Default value is 1 (masked)

IM_PS_SLEEP_OFF_EINT

Interrupt mask.

0 = Do not mask interrupt.

1 = Mask interrupt.

Default value is 1 (masked)

IM_PS_ON_WAKE_EINT

Interrupt mask.

0 = Do not mask interrupt.

WM8311 Datasheet(PDF) 40 Page - Wolfson Microelectronics plc

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