WM8946 datasheet(3/173 Pages) CIRRUS

3 / 173 page

WM8946

Rev 4.5

ANTI-CLIP CONTROL ...................................................................................................................................................................46

QUICK-RELEASE CONTROL .......................................................................................................................................................46

DRC INITIAL VALUE .....................................................................................................................................................................47

DIGITAL-TO-ANALOGUE CONVERTER (DAC)...................................................................... 47

DAC DIGITAL VOLUME CONTROL..............................................................................................................................................47

DAC AUTO-MUTE .........................................................................................................................................................................50

DAC SLOPING STOPBAND FILTER ............................................................................................................................................50

DIGITAL BEEP GENERATOR ................................................................................................. 51

OUTPUT SIGNAL PATH .......................................................................................................... 52

OUTPUT SIGNAL PATHS ENABLE..............................................................................................................................................53

LINE OUTPUT MIXER CONTROL ................................................................................................................................................54

SPEAKER PGA MIXER CONTROL ..............................................................................................................................................56

SPEAKER PGA VOLUME CONTROL...........................................................................................................................................59

SPEAKER OUTPUT CONTROL....................................................................................................................................................61

ANALOGUE OUTPUTS ........................................................................................................... 62

LINE OUTPUTS.............................................................................................................................................................................62

SPEAKER OUTPUTS....................................................................................................................................................................62

EXTERNAL COMPONENTS FOR LINE OUTPUT ........................................................................................................................62

LDO REGULATOR................................................................................................................... 63

REFERENCE VOLTAGES AND MASTER BIAS ..................................................................... 66

POP SUPPRESSION CONTROL ............................................................................................ 68

DISABLED OUTPUT CONTROL...................................................................................................................................................68

OUTPUT DISCHARGE CONTROL ...............................................................................................................................................69

DIGITAL AUDIO INTERFACE.................................................................................................. 69

MASTER AND SLAVE MODE OPERATION.................................................................................................................................69

AUDIO DATA FORMATS ..............................................................................................................................................................70

COMPANDING ..............................................................................................................................................................................73

LOOPBACK ...................................................................................................................................................................................76

DIGITAL PULL-UP AND PULL-DOWN..........................................................................................................................................77

CLOCKING AND SAMPLE RATES.......................................................................................... 77

DIGITAL MIC CLOCKING..............................................................................................................................................................80

FREQUENCY LOCKED LOOP (FLL) ............................................................................................................................................80

EXAMPLE FLL CALCULATION.....................................................................................................................................................84

EXAMPLE FLL SETTINGS............................................................................................................................................................85

VIDEO BUFFER ....................................................................................................................... 86

RECOMMENDED VIDEO BUFFER INITIALISATION SEQUENCES ...........................................................................................88

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

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

INTERRUPTS .......................................................................................................................... 94

CONTROL INTERFACE........................................................................................................... 96

SELECTION OF CONTROL INTERFACE MODE .........................................................................................................................96

2-WIRE (I2C) CONTROL MODE ...................................................................................................................................................97

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

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

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