Production Data
WM8945
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
PD, May 2011, Rev 4.1
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
