温度变送器电原理图

57Microcontrollers&EmbeddedSystemsAPPLICATIONNOTES4~20mA0.5~1.0A/D++D/A[1]V/I114~20mA0~100%4~20mA4mARL17~30V4~20mARV/I0~16mA4mA4~20mA4mA781~2mA2MaximMAX16164~28V80A3.3V/5V30mA2%24V5V5V5VMAX6193VA/DD1RV/I250ORL(4~20mA)3.0V+(17~28V)58APPLICATIONNOTES3TITLC27L2TLC27L2255V19AX9C103X9C504X9C103X9C5041K50K100R9R10R11X9C103Pt1000X9C103X9C103W1Pt1000R12129913RRRV???101111023RWRRV????21VVV???C12R15X9C504X9C504A/DMicrochipFlashPIC16F877[2]RISCCPU810A/D8K(14)Flash368RAM256W0+24VGND+5VC20.1µF123100kOIN4148D1LDOINGNDOUTINFB54MAX1616R1750kO250kOR26.8µF++5V1INGNDOUTMAX619DC022+3VC54.7µF+C1+3VR10200kOR930kOPt1000R116.8kOV1V2INDU/D1234VSSRHU/DINCVCCCSRLRWDR1X9C5048765CS1+5VTLC27L2R15300kOR1410kO+5V+AR2R1610kO1U/D234DR2X9C103INDINCU/DRHVSSVCCCSRLAR3+5V+TLC27L28765CS2+5VPTOUTR191kOR1741kOR1841kOR1310kORWC124.7µF+59Microcontrollers&EmbeddedSystemsAPPLICATIONNOTESEEPROM14WDTPIC16F87784PIC16F8774PIC16F877210A/D033(RB0)R2336RB3R2035RB2R21+34R2219/20RD0/RD1I/OLCD28/29/30RD5/RD6/RD7I/OD/ATLC561523/24RC4/RC5I/OX9C103X9C50421/22RD2/RD3I/OX9C103X9C504/4V/I5D/AV/ID/ATLC5615D/A10CMOSDAC5V31.75mW1.21MHzV/ITITLE2012R3R4R5R6RfR8T1ViIoRfR5RLR8RfR5R6RfR5R6IoR4=R3,R6=R5533)(533)(LfoiLoiRRRRRIRRRVRIV??????35fioRRRVI???MCLR/VPPRA0/AN0RA1/AN1RA2/AN2/VREF-RA3/AN3/VREF+RA4/TOCKIRA5/AN4/SSRE1/WR/AN6RE0/RD/AN5RE2//CS/AN7VDDVSSOSC1/CLKINOSC2/CLKOUTRC0/T1OSO/T1CKIRC1/T1OSI/CCP2RC2/CCP1RC3/SCK/SCLRD0/PSP0RD1/PSP1RD2/PSP2RD3/PSP3RC4/SDI/SDARC5/SDORC6/TX/CKRB7RB6RB5RB4RB3RB2RB1RB0/INT0VDDVSSRD7/PSP7RD6/PSP6RD5/PSP5RD4/PSP4RC7/RX/DTPIC16F877C320pFY11MHzC420pFS1RESET+5VR110kO1234567891011121314151617181920LCDDILCDCKR20“”4039383736353433323130292827262524232221INDU/DCS2CS1TXDRXD+3V+3V“”“”“”SLCKDINCSPTOUTR21R22R2320kO20kO20kO20kO60APPLICATIONNOTESR3=100kR5=40kRf=100Vi=0~5VIo=0~20mAV/I+V(R1+Rf)IomaxIomaxIo4mA2~5MAX161680AMAX619100AX9C103X9C504500ATLC27L2120APIC16F8771mAV/ITLC5615350ATLE2012230AICL7660200A500AIAIA0.08+0.1+0.5+0.5+0.12+1+0.35+0.23+0.2+0.5=3.58mAIA4mA2W04mAA/DA/D1MHzA/D1/32A_D_Change(){ADCON1=0x8e;ADCS1=1;ADCS0=0;//A/Dfosc/32CHS0=0;CHS1=0;CHS2=0;//A/D0ADON=1;for(i=0;i=100;i++);A/DADGO=1;while(ADGO==1);ad_result1=(ADRESH&0x03)*256+ADRESL;ADGO=0;A/D}A/D6510A/DLCDA/D10~300PIC16F87710A/DA/D66t301234C647µF+U4DINSCLKCS1234TLC5615ICL7660OUTACSSCLKDINAGNDVDDREFINOUTBNCWGNDW+VOUTVCCOSCLV876587655V+5V+5VViR3100kO2.5VR4100kO+5VAR1R81kOTLE20125VR540kOR640kORf100OV19013IoRL250O++24V61Microcontrollers&EmbeddedSystemsAPPLICATIONNOTESA/DNktkA/DNiti(tktk+1)(Nktk)(Nk+1tk+1)BKBK+1kkkikkkiNNNNtttt????????11)()(/A/D/A/D/A/D0010536021071815371204132257673091135464240816451471505162558646020116576727092875254180618285977903071956683001023ttk+1titkNkNiNk+1NBk+1BkunsignedlongCount_Tem(unsignedintad_counter){unsignedlongjs1,js2;unsignedcharjs=0;while(1){js1=counter[js];js2=counter[js+1];if(ad_counter=js1&&ad_counter=js2)Ni(NkNk+1){temp1=tempture[js];temp2=tempture[js+1];temp=temp1+(ad_counter-js1)*500/(js2-js1);returntemp;//}js=js+1;if(js61){break;}}}0.1%FS1..:19992..:2002