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1、在注重素质教育的今天,社会实践活动一直被视为高校培养德、智、体、美、劳全面发展的优秀人才的重要途径。暑期社会实践活动是学校教育向课堂外的一种延伸,也是推进素质教育进程的重要手段。它有助于当代大学生接触社会,了解社会。同时,实践也是大学生学习知识、锻炼才干的有效途径,更是大学生服务社会、回报社会的一种良好形式。时光荏苒,岁月如白驹过隙,不经意间,我们即将从多彩的大学毕业,完成一个从大学生到社会人的转变。四年的大学生涯,让我明白了许许多多的科学知识和人生哲理,以及数不尽的感悟和成长。然只有将所学的理论知识付诸于
2、社会的实践,才能检验和实现理论自身的价值,也只有将理论付诸于实践才能使理论得以检验。同样,一个人的价值也是通过实践活动来实现的,也只有通过实践才能锻炼人的品质,彰显人的时代风貌。而毕业实习作为大学的最后一课,也是最后一刻,我倍加珍惜,从而可以较深层次的理解社会,以便为将来能更好的胜任工作打下坚实的基础。附录AMAX232-5V-Powered,MultichannelRS-232Drivers/ReceiversTheMAX232isadualdriver/receiverthatincludesacapa
3、citivevoltagegeneratortosupplyTIA/EIA-232-Fvoltagelevelsfromasingle5-Vsupply.EachreceiverconvertsTIA/EIA-232-Finputsto5-VTTL/CMOSlevels.Thesereceivershaveatypicalthresholdof1.3V,atypicalhysteresisof0.5V,andcanaccept±30-Vinputs.EachdriverconvertsTTL/CMOSinp
4、utlevelsintoTIA/EIA-232-Flevels.Thedriver,receiver,andvoltage-generatorfunctionsareavailableascellsintheTexasInstrumentsLinASIClibrary.TheMAX220–MAX249containfoursections:dualcharge-pumpDC-DCvoltageconverters,RS-232drivers,RS-232receivers,andreceiverandtra
5、nsmitterenablecontrolinputs.DualCharge-PumpVoltageConverterTheMAX220–MAX249havetwointernalcharge-pumpsthatconvert+5Vto±10V(unloaded)forRS-232driveroperation.ThefirstconverterusescapacitorC1todoublethe+5Vinputto+10VonC3attheV+output.Thesecondconverterusesca
6、pacitorC2toinvert+10Vto-10VonC4attheV-output.Asmallamountofpowermaybedrawnfromthe+10V(V+)and-10V(V-)outputstopowerexternalcircuitry(seetheTypicalOperatingCharacteristicssection),exceptontheMAX225andMAX245–MAX247,wherethesepinsarenotavailable.V+andV-arenotr
7、egulated,sotheoutputvoltagedropswithincreasingloadcurrent.DonotloadV+andV-toapointthatviolatestheminimum±5VEIA/TIA-232EdriveroutputvoltagewhensourcingcurrentfromV+andV-toexternalcircuitry.WhenusingtheshutdownfeatureintheMAX222,MAX225,MAX230,MAX235,MAX236,M
8、AX240,MAX241,andMAX245–MAX249,avoidusingV+andV-topowerexternalcircuitry.Whenthesepartsareshutdown,V-fallsto0V,andV+fallsto+5V.Forapplicationswherea+10VexternalsupplyisappliedtotheV+pin(insteadofusingtheintern