SPI总线数据远距离传输实现

©1994-2010ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.(545007):SPI,SPI,RS422/RS485,MAX3045MAX3093RS422/RS485,SPI,5,SPI1200m,SPI:SPI;;RS422/RS485:TN919.71:BRemotetransmissionofSPIbusdataLiangDejian,LiuYuqiong(LiuzhouTransportVocationalTechnicalCollege,Liuzhou545007,China)Abstract:TheSPIbusisakindofcommunicationprotocolsthatserialsynchronouswerefoundwideuseinshortdistance.ItiscounteredthequestionthattheSPIbusdatacanptberemote(data)transmission.Inthistext,weintroducetousecommunicationprotocolofRS422/RS485.UseMAX3045&MAX3093chipstoconstituteRS422/RS485transceivercircuit.Thetransmis2sionmodeoftheSPIbusdataischangedfromimbalancetransmissionmodetobebalancetrans2missionmode.UseCat.5twisted2pairtobetransmissionmedium;tomakethatthereliabledis2tanceoftheSPIbusdatacanbeextendthroughto1200meter.ToexpandedtheappliedrangeoftheSPIbus.Keywords:theSPIbus;remotedatatransmission;protocolofRS422/RS480SPIMotorola,MCU,,,,,E2PROMA/DD/ALEDLCD,,SPI4:(SLCK)(SS)/(MOSI)/(MOSI),1SPI,,,©1994-2010ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.()SCLK©1994-2010ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.(305m/)5,,1220m,100kHz,MAX7221,LED3(SCLK)4,4,1200m,7.3s,SPI,SCLK,,SCLKMOSI,4(1)SPI,RS422,RS422,SPI,,,,,,,SPI40kHz,(2),55,,,,(3)RS422/RSv485,,300mRS422,100,,100,,,,RC,5,C,5RC5SPI,SPI,SPI1200SPI©1994-2010ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.[1],,.RS232/RS485[J].,2005(3):11213.[2],,.RS485[J].,2006(3):22226.[3],,.RS422RS2485[J].,2005(1):32235.[4],.RS422/RS485[J].,2008(1):41243.[5],.SPI[J].,2007(10):2122214.[6]..,2000(6):123.[7]MAXIM.[EB/OL].[8]MAXIM.[EB/OL].(19642),,,,,E2mail:[e-mail](19652),,,,E2mail:[e-mail](67)4MSP430F149LDB6,,,,,[8][1].[M].:,2002:6210.[2],.[M].:,2004:5216.[3].MSP430FLASH16[M].:,2001:45273.[4].MSP430[M].:,2002:56262.[5]LowPower,HighPrecisionOperationalAmplifiersOP97Datasheet[M].2003:325.[6]UltraslowOffsetVoltageOperationalAmplifiersOP07Datasheet[M].2002:225.[7].[M].:,1998:822104.[8].LDB[M].2006:124.,,1948,1982,,E2mail:[e-mail],,,1984,E2mail:[e-mail]