WM8310 datasheet(37/291 Pages) WOLFSON

37 / 291 page

Pre-Production

WM8310

PP, May 2012, Rev 3.1

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 WM8310 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.

1 = Mask interrupt.

Default value is 1 (masked)

Table 4 Power State Interrupts

11.5 POWER STATE GPIO INDICATION

The WM8310 can be configured to generate logic signals via GPIO pins to indicate the current Power

State. See Section 21 for details of configuring GPIO pins.

A GPIO pin configured as “ON state” output will be asserted when the WM8310 is in the ON state.

A GPIO pin configured as “SLEEP state” output will be asserted when the WM8310 is in the SLEEP

state.

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