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WM8281ECS/R Scheda tecnica(PDF) 6 Page - Cirrus Logic

Il numero della parte WM8281ECS/R
Spiegazioni elettronici  Low Power Audio System with Ambient Noise Cancellation and Echo Cancellation
PDF  392 Pages
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Produttore elettronici  CIRRUS [Cirrus Logic]
Homepage  http://www.cirrus.com
Logo CIRRUS - Cirrus Logic

WM8281ECS/R Scheda tecnica(HTML) 6 Page - Cirrus Logic

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WM8281
6
Rev 4.0
EXAMPLE FLL CALCULATION ..................................................................................................................................................288
EXAMPLE FLL SETTINGS..........................................................................................................................................................289
CONTROL INTERFACE ........................................................................................................290
2-WIRE (I2C) CONTROL MODE .................................................................................................................................................291
4-WIRE (SPI) CONTROL MODE.................................................................................................................................................295
CONTROL WRITE SEQUENCER .........................................................................................296
INITIATING A SEQUENCE..........................................................................................................................................................296
AUTOMATIC SAMPLE RATE DETECTION SEQUENCES ........................................................................................................297
JACK DETECT, GPIO, MICDET CLAMP, AND WAKE-UP SEQUENCES .................................................................................298
DRC SIGNAL DETECT SEQUENCES ........................................................................................................................................299
BOOT SEQUENCE......................................................................................................................................................................300
SEQUENCER OUTPUTS AND READBACK ..............................................................................................................................300
PROGRAMMING A SEQUENCE ................................................................................................................................................301
SEQUENCER MEMORY DEFINITION .......................................................................................................................................302
CHARGE PUMPS, REGULATORS AND VOLTAGE REFERENCE......................................305
CHARGE PUMPS AND LDO2 REGULATOR .............................................................................................................................305
MICROPHONE BIAS (MICBIAS) CONTROL ..............................................................................................................................306
VOLTAGE REFERENCE CIRCUIT .............................................................................................................................................306
LDO1 REGULATOR AND DCVDD SUPPLY ..............................................................................................................................307
BLOCK DIAGRAM AND CONTROL REGISTERS ......................................................................................................................308
JTAG INTERFACE .................................................................................................................312
THERMAL SHUTDOWN AND SHORT CIRCUIT PROTECTION..........................................313
POWER-ON RESET (POR) ...................................................................................................314
HARDWARE RESET, SOFTWARE RESET, WAKE-UP, AND DEVICE ID...........................317
REGISTER MAP ......................................................................................................... 319
APPLICATIONS INFORMATION ............................................................................... 373
RECOMMENDED EXTERNAL COMPONENTS....................................................................373
ANALOGUE INPUT PATHS ........................................................................................................................................................373
DIGITAL MICROPHONE INPUT PATHS ....................................................................................................................................373
MICROPHONE BIAS CIRCUIT ...................................................................................................................................................374
HEADPHONE DRIVER OUTPUT PATH .....................................................................................................................................375
SPEAKER DRIVER OUTPUT PATH ...........................................................................................................................................377
POWER SUPPLY DECOUPLING ...............................................................................................................................................379
VOLTAGE REFERENCE EXTERNAL COMPONENTS ..............................................................................................................379
CHARGE PUMP COMPONENTS ...............................................................................................................................................380
EXTERNAL ACCESSORY DETECTION COMPONENTS..........................................................................................................380
RECOMMENDED EXTERNAL COMPONENTS DIAGRAM .......................................................................................................382
RESETS SUMMARY..............................................................................................................383
OUTPUT SIGNAL DRIVE STRENGTH CONTROL ...............................................................384
DIGITAL AUDIO INTERFACE CLOCKING CONFIGURATIONS ..........................................386
PCB LAYOUT CONSIDERATIONS .......................................................................................389
PACKAGE DIMENSIONS........................................................................................... 390
IMPORTANT NOTICE ................................................................................................ 391
REVISION HISTORY .................................................................................................. 392



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