Integratinganalog-to-digitalconverters(ADCs)featuringbinary-
codeddecimal(BCD)outputsfordisplayinterfaceofferanumber
ofexcellentfeatures,aswellashighresolution,ataverylowcost.
Theseadvantagesincludeauto-zeroing,sign-magnitudecoding,
noiseaveraging,andhighimpedanceinputsandarealsoattrac-
tiveformicroprocessor-basedsystems.Unfortunately,many
display-orientedADCsaredifficulttointerfaceduetothemulti-
plexedBCDformatoftheoutputs.Anexceptionisthe4-1/2digit
TC7135ADC,whichprovidesa"strobe"output.AN785SimplifyA/DConverterInterfacewithSoftwareAuthors:GaryGrandboisandWesFreeman,INTERFACEHARDWAREMicrochipTechnology,Inc.ThecompleteTC7135-to-18255AhardwareinterfaceisshowninFigure1.TheonlydigitstrobeusedisDS5(MSD),andtheBUSYoutputisignored.TounderstandwhytheotherdigitstrobesarenotINTRODUCTION
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