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ApplicationReportSNOA926A February2015 RevisedFebruary2015 CapacitiveSensing:Ins and Outsof ActiveShieldingDavidWangABSTRACTC apacitivesensinghasbecomea popularalternativeto opticalsensingdueto the advantagesitpossessesin proximity/gesturedetection,materialanaly sis,liquid-levelsensing, powerconsumption,sensingdifferenttypesof materials,and sensingrange,thereare certainaspectsof usingthe technologythat ,parasiticcapacitance,externalinterferen ce,andtemperature/humiditychangesshouldb eaddressedin ,thereare waysto helpmitigatethesefactorsso it doesnotaffectthe thosewaysis reduceEMI interferenceand helpfocusthe sensingfield of a conceptof activeshielding,use casesfor howshieldingcan helpmitigateparasiticand environmentalinterferencefactors,and how to implementit with the FDC1004in ActiveShieldingin of Figures1 ElectricFieldLinesBetweenCH and GND- no DifferentialConfiguration, Top SHLD1 RingaroundCIN1with ProximityFromthe Top ProximityFromthe a registeredtrademarkof othertrademarksare the propertyof February2015 RevisedFebruary2015 CapacitiveSensing:Ins and Outsof ActiveShieldingSubmitDocumentationFeedba ckCopyright 2015,TexasInstrumentsIncorporatedDensity Plot: V, : > + : : : : : : : : : : : : : : : : : : < +000 : Plot: V, : > +.
Application Report SNOA926A–February 2015–Revised February 2015 Capacitive Sensing: Ins and Outs of Active Shielding DavidWang ABSTRACT Capacitive sensing has become a popular alternative to optical sensing due to the advantages it
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