Data Sheet

FSC‐BT646Datasheet
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 ShenzhenFeasycomTechnologyCo.,Ltd   www.feasycom.com
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 4.3  GeneralPurposeAnalogIO
12‐bitresolutionand10‐bitaccuracy
Analoginputvoltagerange:0.4~1.4or0.4~2.4Vbasedonconfigure
Uptoeightsingle‐endanaloginputchannels
Twooperatingmodes
 Singlemode:A/Dconversionisperformedonetimeonaspecifiedchannel
 PWMsequencemode:WhenPWMtrigger,twoofthreeADCchannelsfrom0to2willautomaticallyconvert
analog data in the sequence of channel [0,1] or channel[1,2] orchannel[0,2]definedbyMODESEL
(ADC_SEQCTL[3:2])
AnA/Dconversioncanbestartedby 
 Softwarewrite1toSWTRGbit
 ExternalpinSTADC
 PWMtriggerwithoptionalstartdelayperiod
EachConversionresultisheldindataregisterwithvalidandoverrunindicators 
Conversionresultscanbecomparedwithspecifiedvalueandusercanselectwhethertogenerateaninterrupt
whenconversionresultmatchesthecompareregistersetting 
Channel8supports2inputsources:Externalanalogvoltageandinternalfixedband‐gapvoltage 
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4.4  GeneralPurposeDigitalIO
Thereare22generalpurposedigitalIOsdefinedinthemodule.AlltheseGPIOscanbeconfiguredbysoftwaretorealize
variousfunctions,suchasbuttoncontrols,LEDdrivesorinterruptsignalstohostcontroller,etc.Donotconnectthemif
notuse.
TheI/OtypeofeachI/OpinscanbeconfiguredbysoftwareindividuallyasInputorPush‐pulloutputmode.Afterthe
chipisreset,theI/Omodeofallpinsisinputmodewithnopull‐upandpull‐downenable.EachI/Opinhasanindividual
pull‐upandpull‐downresistorwhichisabout30kΩ~50kΩforVDDandVss.
4.5  RFInterface
ForThisModule,thedefaultmodeforantennaisinternal,italsohastheinterfaceforexternalantenna.Ifyouneedto
useanexternalantenna,bymodifyingthemoduleonthe0Rresistancetoblockouttheon‐boardantenna;Orcontact
Feasycomformodification.
Theusercanconnecta50ohmantennadirectlytotheRFport.
2402–2480MHzBLE4.2
TXoutputpowerof+13dBm. 
RXsensitivityupto‐90dBm
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