Production Data
WM8903
CLOCKING AND SAMPLE RATES................................................................................ 95
CLK_SYS CONTROL ...................................................................................................................................................... 97
CONTROL INTERFACE CLOCKING .............................................................................................................................. 98
AUTOMATIC CLOCKING CONFIGURATION................................................................................................................. 98
USB CLOCKING MODE................................................................................................................................................ 100
ADC / DAC OPERATION AT 88.2K / 96K ..................................................................................................................... 100
DIGITAL MICROPHONE (DMIC) OPERATION ............................................................................................................ 101
FREQUENCY LOCKED LOOP (FLL)........................................................................... 101
FREE-RUNNING FLL CLOCK....................................................................................................................................... 105
GPIO OUTPUTS FROM FLL......................................................................................................................................... 105
EXAMPLE FLL CALCULATION..................................................................................................................................... 105
EXAMPLE FLL SETTINGS............................................................................................................................................ 106
GENERAL PURPOSE INPUT/OUTPUT (GPIO).......................................................... 107
INTERRUPTS .............................................................................................................. 112
CONTROL INTERFACE............................................................................................... 115
CONTROL WRITE SEQUENCER................................................................................ 118
INITIATING A SEQUENCE............................................................................................................................................ 118
PROGRAMMING A SEQUENCE .................................................................................................................................. 119
DEFAULT SEQUENCES............................................................................................................................................... 122
START-UP SEQUENCE................................................................................................................................................ 122
SHUTDOWN SEQUENCE............................................................................................................................................. 125
POWER-ON RESET .................................................................................................... 127
QUICK START-UP AND SHUTDOWN ........................................................................ 129
QUICK START-UP (DEFAULT SEQUENCE)................................................................................................................ 129
QUICK SHUTDOWN (DEFAULT SEQUENCE) ............................................................................................................ 129
SOFTWARE RESET AND CHIP ID ............................................................................. 130
REGISTER MAP................................................................................................ 131
REGISTER BITS BY ADDRESS.................................................................................. 134
APPLICATIONS INFORMATION ...................................................................... 172
RECOMMENDED EXTERNAL COMPONENTS.......................................................... 172
MIC DETECTION SEQUENCE USING MICBIAS CURRENT ..................................... 174
PACKAGE DIMENSIONS.................................................................................. 176
IMPORTANT NOTICE ....................................................................................... 177
ADDRESS.................................................................................................................... 177
REVISION HISTORY ......................................................................................... 178
PD, Rev 4.5, June 2012
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
