WM8993 datasheet(98/229 Pages) WOLFSON

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WM8993

Production Data

PD, November 2010, Rev 4.0

GENERAL PURPOSE INPUT/OUTPUT

The WM8993 provides a number of GPIO functions to enable interfacing and detection of external

hardware and to provide logic outputs to other devices. The input functions can be polled directly or

can be used to generate an Interrupt (IRQ) event. The GPIO and Interrupt circuits support the

following functions:



Button detect (digital input)



Accessory detection (MICBIAS current detection)



Clock output (CLK_SYS divided by OPCLK_DIV)



FLL Lock status output



Temperature sensor output



Control Write Sequencer status



Logic ‘1’ and logic ‘0’ output



Interrupt event (IRQ) output

GPIO1 CONTROL

The function of the GPIO1 pin can be selected using the GPIO1_SEL field. The available functions

are described individually in the subsequent sections. Internal pull-up and pull-down resistors can be

enabled for interfacing with external signal sources or push-buttons.

GPIO1 may be configured as an input. In this configuration, the GPIO1 is an input to the Interrupt

function, with selectable de-bounce and polarity control. The associated interrupt bit is latched once

set and can be polled at any time or used to generate Interrupt events. See “Interrupts” for more

details of the Interrupt event handling.

The interrupt bit is latched once set; it is reset by writing a logic ‘1’ to the GPIO1_EINT register bit.

De-bouncing is provided in order to avoid false event triggers. Note that TOCLK must be enabled

when this input de-bouncing is required.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R18 (12h)

GPIO CTRL

GPIO1_EIN

GPIO1 interrupt

0 = interrupt not set

1 = interrupt is set

Cleared when a ‘1’ is written

R19 (13h)

GPIO 1

GPIO1_PU

GPIO1 pull-up resistor enable

0 = pull-up disabled

1 = pull-up enabled

GPIO1_PD

GPIO1 pull-down resistor enable

0 = pull-down disabled

1 = pull-down enabled

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