TC7109自动远程数据记录

AMicrochipTechnologyanalog-to-digitalconverter,a2K-byte

CMOSstaticRAM,andsomegatesandcounterscanbe

combinedtoformalow-cost,flexible,standalonedatalogging

system.AlltheICsareCMOSandtheclockfrequencyislow,so

powersupplycurrentisonlyacoupleofmilliamperes.Theunit

willstorea13-bitconversion(12-bitplussign)intwoconsecu-

tivebytesofmemory,withaprogrammabletimeinterval

betweenmeasurements.Thecircuitisusefulforlogging

temperatureorotherprocesscontrolvariablesinremoteloca-

tionsorhostileenvironments.Itisalsousefulinthelabfor

makingunattended,repetitivemeasurementsoflong-termdrift,

componentaging,etc.AN796TC7109RecordsRemoteDataAutomaticallygoeslowforoneclockcycle.AfterCE/LOADgoeshigh,thelowAuthor:WesFreeman,byteoftheconversionislatchedintomemory,IC6isagainMicrochipTechnology,Inc.incremented,LBENgoeshigh,andthedataoutputsreturntotheirhigh-impedancestate.INTRODUCTIONDatacan