WM8948ECSSLASHR datasheet(3/189 Pages) WOLFSON

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Production Data

WM8948

PD, May 2011, Rev 4.1

DIGITAL-TO-ANALOGUE CONVERTER (DAC) .......................................................... 48

DAC DIGITAL VOLUME CONTROL.......................................................................................................... 48

DAC AUTO-MUTE..................................................................................................................................... 51

DAC SLOPING STOPBAND FILTER ........................................................................................................ 51

DIGITAL BEEP GENERATOR ..................................................................................... 52

OUTPUT SIGNAL PATH.............................................................................................. 53

OUTPUT SIGNAL PATHS ENABLE.......................................................................................................... 54

LINE OUTPUT MIXER CONTROL ............................................................................................................ 55

SPEAKER PGA MIXER CONTROL .......................................................................................................... 57

SPEAKER PGA VOLUME CONTROL....................................................................................................... 60

SPEAKER OUTPUT CONTROL................................................................................................................ 62

ANALOGUE OUTPUTS ............................................................................................... 63

LINE OUTPUTS ........................................................................................................................................ 63

SPEAKER OUTPUTS................................................................................................................................ 63

EXTERNAL COMPONENTS FOR LINE OUTPUT .................................................................................... 63

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

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

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

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

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

DIGITAL AUDIO INTERFACE...................................................................................... 70

MASTER AND SLAVE MODE OPERATION ............................................................................................. 70

AUDIO DATA FORMATS .......................................................................................................................... 71

COMPANDING.......................................................................................................................................... 74

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

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

CLOCKING AND SAMPLE RATES.............................................................................. 78

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

FREQUENCY LOCKED LOOP (FLL)........................................................................................................ 81

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

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

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

RECOMMENDED VIDEO BUFFER INITIALISATION SEQUENCE .......................................................... 88

AUXILIARY ADC.......................................................................................................... 90

AUXADC CONTROL ................................................................................................................................. 90

AUXADC INPUT CONFIGURATION ......................................................................................................... 91

AUXADC READBACK ............................................................................................................................... 92

TOUCH PANEL CONTROLLER .................................................................................. 93

TOUCH PANEL CONTROL....................................................................................................................... 93

TOUCH PANEL READBACK .................................................................................................................... 94

TOUCH PANEL OPERATING PRINCIPLES............................................................................................. 95

GENERAL PURPOSE INPUT/OUTPUT ...................................................................... 97

GPIO FUNCTION SELECT ..................................................................................................................... 100

INTERRUPTS ............................................................................................................ 101

CONTROL INTERFACE ............................................................................................ 103

SELECTION OF CONTROL INTERFACE MODE ................................................................................... 104

2-WIRE (I2C) CONTROL MODE............................................................................................................. 104

3-WIRE (SPI) CONTROL MODE............................................................................................................. 107

4-WIRE (SPI) CONTROL MODE............................................................................................................. 107

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