WM8946ECSSLASHR datasheet(3/175 Pages) WOLFSON

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Production Data

WM8946

PD, July 2012, Rev 4.3

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 SEQUENCE ..........................................................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...............................................................................................................99

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

WM8946ECS/R Datasheet(PDF) 3 Page - Wolfson Microelectronics plc

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