WM8581 datasheet(6/94 Pages) WOLFSON

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WM8581

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PP Rev 1.0 March 2006

NAME

TYPE

DESCRIPTION

VOUT3L

Analogue Output

DAC channel 3 left output

VOUT3R

Analogue Output

DAC channel 3 right output

Notes :

Digital input pins have Schmitt trigger input buffers. Pins 32, 33, 34 are 5V tolerant.

In hardware control mode, pin 30 is used for UNLOCK flag output.

In hardware control mode, pin 31 is used for NON_AUDIO flag output.

MULTI-FUNCTION PINS

The WM8581 has 7 Multi-Function Input/Output pins (MFP1 etc.). The function and direction (input/output) of these pins

reconfigured using the HWMODE input pin and software register control as shown below. If HWMODE is set, the MFPs have the

function shown in column 1 of Table 1. If HWMODE is not set, and the register SAIF_EN is set, the MFPs have the function shown

in column 2. Otherwise, the GPOnOP registers determine the MFP function as shown in columns 3 and 4.

PIN NAME

HARDWARE

CONTROL MODE

FUNCTION

SECONDARY AUDIO

INTERFACE FUNCTION

S/PDIF INPUT &

INDEPENDENT

CLOCKING

GENERAL PURPOSE

OUTPUT FUNCTION

MFP1

PAIFTX_BCLK

n/a

PAIFTX_BCLK

GPO1

MFP2

ADCMCLK

n/a

ADCMCLK

GPO2

MFP3

DR1

n/a

SPDIFIN2

GPO3

MFP4

DR2

SAIF_DIN

SPDIFIN3

GPO4

MFP5

DR3

SAIF_DOUT

SPDIFIN4

GPO5

MFP6

DR4

SAIF_BCLK

GPO6

MFP7

ALLPD

SAIF_LRCLK

GPO7

Table 1 Multi-Function Pin Configuration

Notes:

These pins are not used as part of the Secondary Audio Interface, so their function is that of either Column 3 or Column 4.

MFP1 can by GPO1 only if ADC_CLKSEL and PAIFTXMST_CLKSEL (if in master mode) source MCLK.

MFP2 can be GPO2 if neither ADC_CLKSEL, TX_CLKSEL or SAIFMST_CLKSEL (if in master mode) source ADCMCLK.

HWMODE = 1

GPIOnOP

SAIF_EN = 1

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