基于8051的MCP3201的A / D转换

Inembeddedcontrollerapplications,itisoftendesir-

abletoprovideameanstodigitizeanalogsignals.The

MCP320112-bitAnalog-to-Digital(A/D)Converter

givesthedesigneraneasymeanstoaddthisfeatureto

amicrocontrollerwithaminimalnumberofconnec-

tions.

ThisApplicationNotewilldemonstratehoweasyitisto

connecttheMPC3201toan8051-compatiblemicro-

processor.

TheMCP3201isafast100kHz12-bitA/DConverter

featuringlowpowerconsumptionandpowersaving

standbymodes.Thefeaturesofthedeviceincludean

onboardsample-holdandasinglepseudodifferential

input.OutputdatafromtheMCP3201isprovidedbya

highspeedserialinterfacethatiscompatiblewiththe

SPI

®

protocol.TheMCP3201operatesoverabroad

voltagerange(2.7V–5.5V).Thedeviceisofferedin

8-pinPDIPand150milSOICpackages.AN702InterfacingMicrochipMCP3201A/DConverterto8051-BasedMicrocontrollerAuthor:LeeStudleyI/OPORTMETHODMicrochipTechnologyInc.TheserialdataformatsupportedbytheMCP3201isillustratedinFigure1.TheA/DConverterwillcomeoutINTRODUCTIONofitssleepmodeonthefallingedgeofCS.Theconver-sionistheninitiatedwiththefirstrisingedgeofCLK.Inembeddedcontrollerapplications,itisoftendes