光电脉搏血氧心率仪电路设计

336201012ChineseJournalofElectronDevicesVo.l33No.6Dec.2010:2010-06-29:2010-07-22CircuitDesignofPhotoelectricPulseOximeterZHENGWanting,CHENFuyi*(DepartmentofBiomedicalEngineering,WenzhouMedicalCollege,WenzhouZhejiang325035,China)Abstract:Basedontheuseofsiliconphotovoltaiccellstodetectoxygensaturationofthetechnology,theprincipleofpulseoximeteispresentedandatesttomonitorheartrateandbloodoxygenheartrateopticalpulseoxygenmeterwasdesigned.ThesystemadoptsMCUSTC89C58RD+asthecore,withthreecircuitsofimplusecontrolcircui,tthesignalacquisitioncircui,tsignalprocessingcircuitfortestingthebloodoxygenandheartrateatthesametime,andthetestingresultswillbedisplayedbyLCD.Foractualpersonstesting,thebloodoxygenisfrom93to98andtheheartrateisfrom70to75,anditmeetstheactualtestingrequiremen.tThesystemhasadvantagesoflowcos,treasonablestructure,simple,safeandreliable.Keywords:oxygensaturation;pulseoxygenmeasuringprinciple;siliconphotovoltaiccells;MCUSTC89C58RD+EEACC:7510Ddo:i10.3969/j.issn.1005-9490.2010.06.031郑万挺,陈付毅*(,325035):,,STC89C58RD+,,,LCD,93~9870~75,:;;;STC89C58RD+:RH333.1:A:1005-9490(2010)06-0786-04,,,[1],,,,,,,,,,1,,,,A/D1.1,660nm940nm[2-3]555,74LS04,;4066555,555:T=TPH+TPL=0.7(R1+2R2)C(1)T555,TPH,TPL0.01s,4066(),,第6期郑万挺,陈付毅:光电脉搏血氧心率仪电路设计图1脉冲控制电路2:图2血氧探头内部电路图图34066模拟开关电路图1.2,OP07,,,,[4-6],,4066,,,1OP07,图4OPA4277电压跟随电路图图5OP07放大电路图,,,OP07,OP07,OP07,,OP07,,16:G=AU(1)AU,OP07R9,,10,R910k80.01LF,OPA4277,22.1,,STC89C58RD+,RAMROMFLASH,;80MHz,0.15Ls,787电子器件第33卷;EFT(ESD),,,STC,,/2.2,,,6,DMCU1(D1),,图6复位电路2.3(7),,,,STC89C58RD+80MHz,,Tcy=12Tosc,:0.15Ls~1Ls(12MHz),12MHz()1Ls图7时钟振荡电路2.42.4.1(A/D),8bitI2C(InterIntegratedCircuit)A/DTLC549,CMOS(8)(0e~70e)(?0.5LSB)(17Ls)(3~6V)TTLCMOS8图8(A/D)模数转换电路2.4.2,JM12864F,,8192(16X16)128(8X16)64X256RAM(GDRAM)(+5V,,),MCU(843)()9图9JM12864液晶显示电路V0R12864JM12864_CON15RS(/;)R/W(;)E(788第6期郑万挺,陈付毅:光电脉搏血氧心率仪电路设计;)DB0)DB7()PSB(/:H-;L-)RESET()[10]3,,A/D,10,11TLC1549ADC:图10主程序设计流程图图11TLC1549ADC流程图4,,,,,,,4V,,A/D,,,,,98,,70,,5STC89C58RD+,,,,:[1].[J].,1995,(2).[2],,,.[J].,2006,(7).[3].[J].,1991(3).[4],,.[J].(),2009(2).[5].[J].(),1986(3).[6].[J].,1996,(1).[7],,,.[J]..,1994,(1).[8].[J].,1985,(5).[9],.[J].(),2002,(2).[10],.Q[J].,2008,(4).[11].[J].,1999,(2).[12],.[J].,1999,(22).[13],.[J].,2008,(21).(1981-),,,,,,,,[e-mail];(1956-),,,,789