WM8903 datasheet(5/178 Pages) WOLFSON

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Production Data

WM8903

PD, Rev 4.5, June 2012

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

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

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