Data Sheet

FSC‐BT630Datasheet
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 ShenzhenFeasycomTechnologyCo.,Ltdwww.feasycom.com
‐14‐
HWdecimationfilters
ThePDMmoduleillustrated
The PDM module illustrated is interfacing up to two digital microphones with the PDM interface. It implements
EasyDMA, which relieves real‐time requirements associated with controlling the PDM slave from a low priority CPU
executioncontext.Italsoincludesallthenecessarydigitalfilterelementsto
producePCMsamples.ThePDMmodule
allowscontinuousaudiostreaming.
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4.10.1Hardwareexample 
ConnectthemicrophoneclocktoCLK,anddatatoDIN.
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Note that in a single-microphone (mono) configuration, depending on the microphone’s implementation, either the
left or the right channel (sampled at falling or rising CLK edge respectively) will contain reliable data. If two
microphones are used, one of them has to be set as left, the other as right (L/R pin tied high or to GND on the
respective microphone). It is strongly recommended to use two microphones of exactly the same brand and type so
that their timings in left and right operation match.
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4.11Nearfieldcommunicationtag(NFC)
TheNFCperipheral(referredtoasthe'NFCperipheral'fromnowon)supportscommunicationsignalinterfacetypeA
and106kbpsbitratefromtheNFCForum.
Withappropriatesoftware,theNFCperipheralcanbeusedtoemulatethelisteningdeviceNFC‐Aasspecifiedbythe
NFCForum.
Listedhere
arethemainfeaturesfortheNFCperipheral:
NFC‐Alistenmodeoperation
• 13.56MHzinputfrequency
•
Bitrate106kbps
Wake‐on‐fieldlowpowerfielddetection(SENSE)mode
FrameassembleanddisassemblefortheNFC‐AframesspecifiedbytheNFCForum
Programmableframetimingcontroller
Integratedautomaticcollisionresolution,CRCandparityfunctions
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4.11.1Antennainterface 
InACTIVATEDstate,anamplituderegulatorwilladjustthevoltageswingontheantennapinstoavaluethatiswithin
theV
swing
limit.