WM8948 データシートの表示（PDF） - Wolfson Microelectronics plc
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WM8948
Wolfson Microelectronics plc
WM8948 Datasheet PDF : 189 Pages
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Production Data
WM8948
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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PD, May 2011, Rev 4.1
3
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