PIC18CXXX PIC16CXXX直流伺服电机应用

ThePICmicro

®

microcontrollermakesanidealchoice

foranembeddedDCServomotorapplication.ThePIC-

microfamilyhasmanydevicesandoptionsforthe

embeddeddesignertochoosefrom.Furthermore,pin

compatibledevicesareofferedinthePIC16CXXXand

PIC18CXXXdevicefamilies,whichmakesitpossibleto

useeitherdeviceinthesamehardwaredesign.This

givesthedesigneraneasymigrationpath,depending

onthefeaturesandperformancerequiredintheappli-

cation.Inparticular,thisservomotorhasbeenimple-

mentedonboththePIC18C452andPIC16F877

devices,andwe’lllookattheMCUresourcesrequired

tosupporttheservomotorapplication.Withanunder-

standingoftheservomotorfunctions,youcanstartwith

thedesignshownhereandimplementyourowncus-

tomDCservomotorapplicationbasedonthePICmicro

devicethatsuitsyourneeds.

ThePICmicroMCUhandlesmanyfunctionsinthe

servomotorapplication,suchas:

•Usercontrolinterface

•Measurementofmotorposition

•Computationofmotionprofile

•ComputationoferrorsignalandPIDcompensa-

tionalgorithm

•Generationofmotordrivesignal

•Communicationwithnon-volatileEEPROM

memoryAN696PIC18CXXX/PIC16CXXXDCServomotorApplicationAschematicdiagramfortheapplicationisshowninAuthor:StephenBowlingFigure1.TheDCmotorisdrivenbyaSGS-ThomsonMicrochipTechnologyInc.L6203H-bridgedriverICthatusesDMOSoutputChandler,AZdevicesandcandeliverupto3Aoutputcurrentatsup-plyvoltagesupto52V.Thedevicehasaninternalchargepumpfordrivingthehigh-side