WM8994ECSSLASHR datasheet(8/363 Pages) CIRRUS

8 / 363 page

WM8994

Rev 4.6

PIN DESCRIPTION

A description of each pin on the WM8994 is provided below.

Note that a table detailing the associated power domain for every input and output pin is provided on the following page.

Note that, where multiple pins share a common name, these pins should be tied together on the PCB.

PIN NO

NAME

TYPE

DESCRIPTION

ADCDAT1

Digital Output

Audio interface 1 ADC digital audio data

ADCLRCLK1/

GPIO1

Digital Input / Output

Audio interface 1 ADC left / right clock /

General Purpose pin GPIO 1/

Control interface data output

D6, E7,

AGND

Supply

Analogue ground (Return path for AVDD1, AVDD2 and LDO1VDD)

AVDD1

Supply / Analogue

Output

Analogue core supply / LDO1 Output

AVDD2

Supply

Bandgap reference, analogue class D and FLL supply

BCLK1

Digital Input / Output

Audio interface 1 bit clock

CIFMODE

Digital Input

Selects 2-wire or 3/4-wire control interface mode

CPCA

Analogue Output

Charge pump fly-back capacitor pin

CPCB

Analogue Output

Charge pump fly-back capacitor pin

CPGND

Supply

Charge pump ground (Return path for CPVDD)

CPVDD

Supply

Charge pump supply

CPVOUTN

Analogue Output

Charge pump negative supply decoupling pin (HPOUT1L, HPOUT1R)

CPVOUTP

Analogue Output

Charge pump positive supply decoupling pin (HPOUT1L, HPOUT1R)

¯¯ /ADDR

Digital Input

3-/4-wire (SPI) chip select or 2-wire (I2C) address select

DACDAT1

Digital Input

Audio interface 1 DAC digital audio data

DBVDD

Supply

Digital buffer (I/O) supply

DCVDD

Supply / Analogue

Output

Digital core supply / LDO2 output

DGND

Supply

Digital ground (Return path for DCVDD, DBVDD and LDO2VDD)

DMICCLK

Digital Output

Digital MIC clock output

GPIO2/

MCLK2

Digital Input

General Purpose pin GPI 2 /

Master clock 2

GPIO3/

BCLK2

Digital Input / Output

General Purpose pin GPIO 3 /

Audio interface 2 bit clock

GPIO4/

LRCLK2

Digital Input / Output

General Purpose pin GPIO 4 /

Audio interface 2 left / right clock

GPIO5/

DACDAT2

Digital Input / Output

General Purpose pin GPIO 5 /

Audio interface 2 DAC digital audio data

GPIO6/

ADCLRCLK2

Digital Input / Output

General Purpose pin GPIO 6 /

Audio interface 2 ADC left / right clock

GPIO7/

ADCDAT2

Digital Input / Output

General Purpose pin GPIO 7 /

Audio interface 2 ADC digital audio data

GPIO8/

DACDAT3

Digital Input / Output

General Purpose pin GPIO 8 /

Audio interface 3 DAC digital audio data

GPIO9/

ADCDAT3

Digital Input / Output

General Purpose pin GPIO 9 /

Audio interface 3 ADC digital audio data

GPIO10/

LRCLK3

Digital Input / Output

General Purpose pin GPIO 10 /

Audio interface 3 left / right clock

GPIO11/

BCLK3

Digital Input / Output

General Purpose pin GPIO 11 /

Audio interface 3 bit clock

HP2GND

Supply

Analogue ground

HPOUT1FB

Analogue Input

HPOUT1L and HPOUT1R ground loop noise rejection feedback

HPOUT1L

Analogue Output

Left headphone output

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