MCP42XXX数字电位菊花链式通信

TheMCP41XXXandMCP42XXXfamilyofdigital

potentiometersallowfordaisychainingofmultiple

devicesonasingleSPI™bus.Itispossibletocommu-

nicatetomultipledevicesusingone3-wiredatabus

(CS,CLKandDATA),byconnectingtheSOpinonone

devicetotheSIpinofthenextdeviceinthechain.This

applicationnotedetailsoneexampleofsourcecode

thatisusedtocommunicatewitheightdaisychained

devices.MAN747CommunicatingwithDaisyChainedMCP42XXXDigitalPotentiometersCOMMUNICATIONAuthors:CraigL.King&EzanaHaileMicrochipTechnologyInc.Daisychainingallowsmultipledevicestosharethesameclockandchipselectline,freeingI/Opinsonthemicrocontroller.Figure1showsconnectionsforthreeOVERVIEW