CX20921-60-Pin-QFN--01bdab2d61

03/11/15ConexantConfidential•(SoC).TheCX20921isthefirstproductinthiscategorywithanintegratedvoicetriggerfunctionthatsupportsalowsystempowerWake-on-Voice(WoV)function.Thedeviceincludes24-bitmicrophoneAnalog-to-DigitalConverters(ADCs),apowerfuldualcore32-bithardwareDigitalSignalProcessor(DSP),andintegratedpowermanagement.CombinedwithConexant’sAudioSmart™farfieldvoiceinputprocessingsoftwaresuite,includingSmartSourcePickup(SSP)noisesuppressionandfull-duplexAcousticEchoCancellation(AEC),theCX20921istheidealturnkeysolutionforaddingvoicecontrol,voicesearch,andVoiceoverInternetProtocol(VoIP)/speakerphonefunctionalitiestoSmartTV,Set-TopBox(STB),Smartappliances,andautomotivehands-freecontrolandcommunicationsystems.TheCX20921devicesupportsamicrophonearraywithuptotwosynchronizedADCsandprogrammablepre-amplifiers.Eachpre-amplifierispairedwithadedicatedbiassupplytoeliminatecrosstalk.Theentireinputpathguarantees106dBdynamicrange,whichmaximizesspeech-to-noiseratiowithlowboostandpreventsmicrophonesaturation.Conexant'sproprietaryfarfieldAudioSmartsoftwaretakesadvantageofthebuilt-inhardwaretodeliverasuperiorvoiceinteractiveexperienceinthemostchallengingroomenvironments.Thevoiceprocessingchainalsosupportsmulti-threadprocessingstreams,whichareindependentlyoptimizedforvoicecommunicationandautomaticspeechrecognition.WhenADCandDSPareactiveintheWake-on-Voice(WoV)mode,thedeviceconsumeslessthan70mW,whichiswellbelowthe0.5WEuropeanCommission(EC)1275/2008requirementforstandbypower.Applications•Voice-controlledSmartTV/STB•SmartBluetooth/WiFispeaker•Voiceinteractivesmartappliance•InternetofThings(IOT)devices•Automotivehands-freecontrol/communicationFeatures•Low-powerWoVmodewithanembeddedthird-partyspeechrecognitionengine•Enableshigh-performanceAutomaticSpeechRecognition(ASR)andexcellentvoiceclaritywithonlytwomicrophonesthroughConexant'sAudioSmartvoiceinputprocessingsoftware,whichincludes:–SSPnoisesuppression–Full-duplexAEC•Compatiblewithmultipleleadingembeddedandserver-basedspeechrecognitionvendors•Dualfarfield,24-bit,106dBdynamicrangeADCswithmicrophonepre-amplificationandindependentMicrophoneBias(micbias)supply—enableslowmicrophonegainforfarfieldsignalswithoutsaturatingforloudnearfieldsignals•Powerful,dual-core32-bitDSP•MultipleIntegratedInterchipSound(I2S)serialdatainterfaces•Inter-IntegratedCircuit(I2C)serialcontrolinterface•SerialPeripheralInterface(SPI)forlow-costflashsupportCX20921FarFieldVoiceInputProcessorSoCAudioSmartDataSheetCX20921AudioSmartDataSheetRevisionHistoryConexantConfidential03/11/15001DSR01iiRevisionHistoryDocumentNo.ReleaseDateChangeDescription001DSR0103/11/15Updated:•PinSignalDefinitionstable.•DataTransferontheI2CBus.001DSR0002/13/15Updated:•Template.•Completedocumentupdate.C10/13//14Updated:•PackageThermalDatatable.Added:•ExternalSPIFlashRequirementsandApprovedDevicesList.•CX20921DevicePCBFootprint.B02/14/14Updated:•OrderingPartNumbertable.•TestBoardandConditionsforThermalDatatable.Added:•PowerConsumption.A06/07/13Initialrelease.CX20921AudioSmartDataSheetTableofContentsConexantConfidential03/11/15001DSR01iiiTableofContentsGeneralDescription.......................................................................................................................................................iApplications...................................................................................................................................................................iFeatures..........................................................................................................................................................................iRevisionHistory...........................................................................................................................................................iiIntroduction...................................................................................................................................................................1Overview...............................................................................................................................................................................1Features................................................................................................................................................................................2Cores..........................................................................................................................................................................2On-ChipMemory........................................................................................................................................................2VoiceCODEC.............................................................................................................................................................2Interfaces........................................................