WM8311 datasheet(41/302 Pages) WOLFSON

41 / 302 page

Pre-Production

WM8311

PP, May 2012, Rev 3.1

ADDRESS

BIT

LABEL

DESCRIPTION

1 = Mask interrupt.

Default value is 1 (masked)

Table 4 Power State Interrupts

11.5 POWER STATE GPIO INDICATION

The WM8311 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 WM8311 is in the ON state.

A GPIO pin configured as “SLEEP state” output will be asserted when the WM8311 is in the SLEEP

state.

11.6 ON PIN FUNCTION

The ON

¯¯ pin is intended for connection to the master power switch on the user’s application. It can be

used to start-up the WM8311 from the SLEEP or OFF states and also to power down the system.

This pin operates on the LDO12 (VPMIC) power domain and has an internal pull-up resistor. This pin

is asserted by shorting it to GND. A de-bounce circuit is provided on this input pin.

The behaviour of the ON

¯¯ pin is programmable. The primary action taken on asserting this pin is

determined by the ON_PIN_PRIMACT register field. Note that the ON_PIN_INT interrupt event is

always raised when the ON

¯¯ pin is asserted.

If the pin is held asserted for longer than the timeout period set by ON_PIN_TO, then a secondary

action is executed. The secondary action is determined by the ON_PIN_SECACT register field.

If the pin is held asserted for a further timeout period, then a tertiary action is executed. The tertiary

action is not programmable, and is to generate an OFF request.

An OFF request initiated by the ON

¯¯ pin may be masked during Battery Charging when the

CHG_OFF_MASK bit is set. This allows user-initiated OFF events to be disabled in order to maintain

the Battery Charger operation. See Section 17.7.2.

The status of the ON

¯¯ pin can be read at any time via the ON_PIN_STS register.

Note that the ON

¯¯ pin control registers are locked by the WM8311 User Key. These registers can only

be changed by writing the appropriate code to the Security register, as described in Section 12.4.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R16389

(4005h) ON

Pin Control

9:8

ON_PIN_SECACT

Secondary action of ON

¯¯ pin (taken

after 1 timeout period)

00 = Interrupt

01 = ON request

10 = OFF request

11 = Reserved

Protected by user key

5:4

ON_PIN_PRIMACT

Primary action of ON

¯¯ pin

00 = Ignore

01 = ON request

10 = OFF request

11 = Reserved

Note that an Interrupt is always

raised.

Protected by user key

ON_PIN_STS

Current status of ON

¯¯ pin

0 = Asserted (logic 0)

1 = Not asserted (logic 1)

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