WM8945ECSSLASHR datasheet(3/169 Pages) WOLFSON

3 / 169 page

Production Data

WM8945

PD, May 2011, Rev 4.1

DIGITAL-TO-ANALOGUE CONVERTER (DAC)............................................................ 45

DAC DIGITAL VOLUME CONTROL..........................................................................................................45

DAC AUTO-MUTE.....................................................................................................................................48

DAC SLOPING STOPBAND FILTER ........................................................................................................48

DIGITAL BEEP GENERATOR ....................................................................................... 49

OUTPUT SIGNAL PATH................................................................................................ 50

OUTPUT SIGNAL PATHS ENABLE..........................................................................................................51

LINE OUTPUT MIXER CONTROL ............................................................................................................52

SPEAKER PGA MIXER CONTROL ..........................................................................................................53

SPEAKER PGA VOLUME CONTROL.......................................................................................................55

SPEAKER OUTPUT CONTROL................................................................................................................57

ANALOGUE OUTPUTS ................................................................................................. 58

LINE OUTPUT ...........................................................................................................................................58

SPEAKER OUTPUTS................................................................................................................................58

EXTERNAL COMPONENTS FOR LINE OUTPUT ....................................................................................58

LDO REGULATOR......................................................................................................... 59

REFERENCE VOLTAGES AND MASTER BIAS ........................................................... 61

POP SUPPRESSION CONTROL .................................................................................. 63

DISABLED OUTPUT CONTROL...............................................................................................................63

OUTPUT DISCHARGE CONTROL ...........................................................................................................64

DIGITAL AUDIO INTERFACE........................................................................................ 65

MASTER AND SLAVE MODE OPERATION.............................................................................................65

AUDIO DATA FORMATS ..........................................................................................................................66

COMPANDING ..........................................................................................................................................69

LOOPBACK ...............................................................................................................................................71

DIGITAL PULL-UP AND PULL-DOWN......................................................................................................71

CLOCKING AND SAMPLE RATES................................................................................ 72

DIGITAL MIC CLOCKING .........................................................................................................................75

FREQUENCY LOCKED LOOP (FLL) ........................................................................................................75

EXAMPLE FLL CALCULATION.................................................................................................................78

EXAMPLE FLL SETTINGS........................................................................................................................79

VIDEO BUFFER............................................................................................................. 80

RECOMMENDED VIDEO BUFFER INITIALISATION SEQUENCE ..........................................................82

AUXILIARY ADC ............................................................................................................ 83

AUXADC CONTROL .................................................................................................................................83

AUXADC INPUT CONFIGURATION .........................................................................................................84

AUXADC READBACK ...............................................................................................................................85

TOUCH PANEL CONTROLLER .................................................................................... 86

TOUCH PANEL CONTROL.......................................................................................................................86

TOUCH PANEL READBACK.....................................................................................................................88

TOUCH PANEL OPERATING PRINCIPLES.............................................................................................89

GENERAL PURPOSE INPUT/OUTPUT ........................................................................ 90

GPIO FUNCTION SELECT .......................................................................................................................93

INTERRUPTS ................................................................................................................ 95

CONTROL INTERFACE................................................................................................. 97

SELECTION OF CONTROL INTERFACE MODE.....................................................................................97

2-WIRE (I2C) CONTROL MODE ...............................................................................................................98

3-WIRE (SPI) CONTROL MODE.............................................................................................................100

4-WIRE (SPI) CONTROL MODE.............................................................................................................101

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