WM8281ECSSLASHR datasheet(227/392 Pages) CIRRUS

227 / 392 page

WM8281

Rev 4.0

227

GENERAL PURPOSE INPUT / OUTPUT

The WM8281 provides a number of GPIO functions to enable interfacing and detection of external

hardware and to provide logic outputs to other devices. The GPIO input functions can be used to

generate an Interrupt (IRQ) event. The GPIO and Interrupt circuits support the following functions:



Digital audio interface function (AIFnTXLRCLK)



Logic input / Button detect (GPIO input)



Logic ‘1’ and logic ‘0’ output (GPIO output)



Interrupt (IRQ) status output



DSP Status Flag (DSP IRQn) and RAM status output



Clock output



Frequency Locked Loop (FLL) status output



Frequency Locked Loop (FLL) Clock output



Pulse Width Modulation (PWM) Signal output



Headphone Detection status output



Microphone / Accessory Detection status output



Headphone Enable status output



Boot Sequence status output



Asynchronous Sample Rate Converter (ASRC) Lock status and Configuration Error output



Isochronous Sample Rate Converter (ISRC) Configuration Error output



Over-Temperature, Short Circuit Protection, and Speaker Shutdown status output



Dynamic Range Control (DRC) status output



Control Write Sequencer status output



Control Interface Error status output



Clocking Error status output

Note that the GPIO pins are referenced to different power domains (DBVDD1, DBVDD2 or DBVDD3),

as noted in the “Pin Description” section.

The GPIO4 function shares the same pin as CIF1MISO (see “Control Interface”). The GPIO4 function

is enabled by setting SPI_GPIO = 0, as described in Table 113.

In addition to the functions described in this section, the GPIO5 pin can be configured as an input to

the Control Write Sequencer (see “Control Write Sequencer”). See also Table 85 for details of the

associated register control fields.

The GPIO5 pin is one of the ‘Always On’ digital input / output pins and can be used as a ‘Wake-Up’

input in the low-

power ‘Sleep’ mode. The GPIO5 pin can also be used as an input to the MICDET

Clamp function, supporting additional functionality relating to jack insertion or jack removal events See

“Low Power Sleep Configuration” for further details.

The WM8281 also incorporates a General Purpose Switch feature, which can be used as a

controllable analogue switch; details of this are provided at the end of this “General Purpose Input /

Output

” section.

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