WM8945 查看數據表（PDF） - Wolfson Microelectronics plc
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WM8945 Datasheet PDF : 169 Pages
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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
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PD, May 2011, Rev 4.1
3
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