DS18B20中文资料 (2)

DS1820••••••-55~+1250.5-67~+2570F0.90F•9•200ms•••DS18209DS1820DS1820DS1820DS1820HVAC16SSOPPR3591GND82DQ/73VDDVDDDS1820S16SSOP1DS1820DS1820164ROM23THTLDS18205VDS1820ROM5ROM1ROM2ROM3ROM4ROM5ROMROM6DS1820DS1820THTLEEPROMDS1820THTL1I/OVDDI/O12ROMDS1820I/ODS18201mA5KDS1820I/ODS1820E2I/OMOSFETI/O2E210sI/OVDDDS1820VDD3I/ODS1820SkipROMConvertTGND100DS1820DS1820VDDDS1820DS1820SkipROMDS18200VDD1DS18200I/ODS18204/1+125000000001111101000FA+2500000000001100100032+1/200000000000000010001000000000000000000000-1/21111111111111111FFFF-251111111111001110FFCE-551111111110010010FF92DS1820-550-55-550DS18200.516bit1DS1820-55~+1250.5DS18201/2LSB9bitMSB116bit0.5LSBTEMP_READCOUNT_REMAINCOUNT_PER_CDS1820THTL80.5THTL16THTLDS1820DS182064ROMDS1820648DS182019h48856CRC564ROMROMDS1820ROMDS1820ROM65ROM1ReadROM2MatchROM3SearchRom4SkipROM5AlarmSearchROMDS1820CRCDS18208CRC64ROM64ROM56CRCDS1820ROMCRCCRC=X8+X5+X4+1DS18208CRCCRCCRCDS182064ROMDS18208CRC9CRCDS1820CRCDS1820CRCXOR70848CRC8CRC0DS18208RAMTHTLE2RAME2RAM8THTL1CRCCRCCRCDS1820DS1820I/O95K480s通过单线总线端口访问DS1820的协议如下：••ROM••/DS1820ROM5ROMROM86ROM6ReadROM[33h]DS182088CRCDS1820MatchROM[55h]ROM64ROMDS182064ROMDS182064ROMSkipROM[CCh]64ROMSkipROMSearchROM[F0h]64ROMROM64AlarmSearch[ECh]SearchROMDS1820THTLDS1820I/ODS18200101DS182011DS1820ROMDS18202ConvertT44h1ReadScratchpadCRCBEh9WriteSchratchpad23THTL4Eh23CopyScratchpad2348h2RecallE2B8hReadPowerSupplyDS1820B4h1500msVDDI/O500msConvertT2CopyScratchpadVDDI/O10msCopyScratchpadTX480sRX5KI/ODS182015~60s60~240s210101010WriteScratchpad[4E]DS1820223ReadScratchpad[BEh]098CRCCopyScratchpad[48h]DS1820E2DS1820E2DS18200DS1820110msConvertT[44h]DS1820DS1820DS182001500msRecallE2[B8h]DS18200=1=ReadPowerSupply[B4h]DS18200=1=/DS18201060s1sI/ODS182015s60sI/O101215s060sDS18201sDS182015sI/O15sI/O12I/O60s1s13TINITTRCTSAMPLE15s14TINITTRC15s3LSBTX480-960sRXTX55hMatchROMTX64ROMDS1820TX44hConvertTTXI/OI/O500msTXRXTX55hMatchROMTX64ROMDS1820TXBEhReadScratchpadRX9CRC8CRCCRCCRCTXRX4DS1820LSBTXRXTXCChSkipROMTX4EhWriteScratchpadTXTHTLTXRXTXCChSkipROMTXBEhReadScratchpadRX9CRC8CRCCRCCRCTXRXTXCChSkipROMTX48hCopyScratchpad6msTXRX5DS1820LSBTXTRTXCChSkipROMTX44hConvertTRX18FFh1TXRXTXCChSkipROMTXBEhReadScratchpadRX9CRC8CRCCRCCRCCOUNT_REMAINCOUNT_PER_CTXRXCPU-0.5+7.0V-55+125-55+12526010VDDI/O1/22.84.35.05.55.5V12I/O-0.5+5.5V21VIH2.0VCC+0.3V230VIL-0.3+0.8V24tERR-0+70-550+70+1251/21910VIH2.25.5V23VIL-0.3+0.8V24ILVI/O=0.4V-4.0mA2IQ200350nA8IDD11.5mA56IL5A7-55+125VDD=3.6V5.5VtCONV200500mstSLOT60120stREC1s0rLOW060120s1tLOW1115stRDV15stRSTH480stRSTL4804800stPDHIGHL1560stPDLOW60240sCIN/OUT25pF1VDD3.4V22311mA404mA5IDDVCC5.0V6E2E210ms100A78701255A9070104.3VVDD5.5VDS18B2012of20ROMCOMMANDSFLOWCHARTFigure11CChSKIPROMCOMMANDMASTERTXRESETPULSEDS18B20TXPRESENCEPULSEMASTERTXROMCOMMAND33hREADROMCOMMAND55hMATCHROMCOMMANDF0hSEARCHROMCOMMANDEChALARMSEARCHCOMMANDMASTERTXBIT0DS18B20TXBIT0DS18B20TXBIT0MASTERTXBIT0BIT0MATCH?MASTERTXBIT1BIT1MATCH?BIT63MATCH?MASTERTXBIT63NYYYYYNNNNNNNYYYDS18B20TXBIT1DS18B20TXBIT1MASTERTXBIT1DS18B20TXBIT63DS18B20TXBIT63MASTERTXBIT63BIT0MATCH?BIT1MATCH?BIT63MATCH?NNNYYYDS18B20TXFAMILYCODE1BYTEDS18B20TXSERIALNUMBER6BYTESDS18B20TXCRCBYTEDS18B20TXBIT0DS18B20TXBIT0MASTERTXBIT0NYDEVICE(S)WITHALARMFLAGSET?InitializationSequenceMASTERTXFUNCTIONCOMMAND(FIGURE12)DS18B2013of20DS18B20FUNCTIONCOMMANDSFLOWCHARTFigure12MASTERTXFUNCTIONCOMMANDYN44hCONVERTTEMPERATURE?PARASITEPOWER?NYDS18B20BEGINSCONVERSIONDEVICECONVERTINGTEMPERATURE?NYMASTERRX“0s”MASTERRX“1s”MASTERENABLESSTRONGPULLUPONDQDS18B20CONVERTSTEMPERATUREMASTERDISABLESSTRONGPULLUPYN48hCOPYSCRATCHPAD?PARASITEPOWER?NYMASTERENABLESSTRONGPULL-UPONDQDATACOPIEDFROMSCRATCHPADTOEEPROMMASTERDISABLESSTRONGPULLUPMASTERRX“0s”COPYINPROGRESS?YMASTERRX“1s”NRETURNTOINITIALIZATIONSEQUENCE(FIGURE11)FORNEXTTRANSACTIONB4hREADPOWERSUPPLY?YNPARASITEPOWERED?NMASTERRX“1s”MASTERRX“0s”YMASTERTXTHBYTETOSCRATCHPADYN4EhWRITESCRATCHPAD?MASTERTXTLBYTETOSCRATCHPADMASTERTXCONFIG.BYTETOSCRATCHPADYNYBEhREADSCRATCHPAD?HAVE8BYTESBEENREAD?NMASTERTXRESET?MASTERRXDATABYTEFROMSCRATCHPADNYMASTERRXSCRATCHPADCRCBYTEMASTERRX“1s”YNB8hRECALLE2?MASTERBEGINSDATARECALLFROME2PROMDEVICEBUSYRECALLINGDATA?NYMASTERRX“0s”[e-mail]-----DS1820(DS18B20)DSl820DSl8209()DSl820DSl820CPUDSl820()DSl820DSl820DSl820DSl820-55+1250.5ls()DSl82064DSl820ROM()8(DSl82010H)48856CRC()DSl8208RAM011()18100LSB()10.52(-550125)DSl820226lD518201Ds1820918b20S=1S=000AAH+85,0032H25FF92H552Ds18b201218b20S=1S=00550H+850191H25.0625,FC90H-55DSl820DSl820RoM12ROMDSl820ROMReadROM(ROM)[33H]MatchROM(ROM)[55H]SkipROM(ROM][CCH]SearchROM(ROM)[F0H]Alarmsearch()[ECH]3WriteScratchpad()[4EH]ReadScratchpad()[BEH]CopyScratchpad()[48H]ConvertTemperature()[44H]RecallEPROM()[B8H]ReadPowersupply()[B4H]4(timeslots)DSl820(1)2.25-2to(480us)tlDSl82015-60usDS1820t2(60-240us)MCS5112M.RESETPUSHB;BPUSHAAMOVA,#4;CLRP1.0;MOVB,#250;250DJNZB,$;500usSETBPl.0;MOVB,#6;CLRC;WAITL:JBPl.0,WH;DJNZB,WAITL;DJNZACC,WAITL;SJMPSHORTWH:MOVB,#111WH1:ORLC,P1.0DJNZB,WH1;SHORT:POPAPOPBRET(2)to22532254to15usDSl820t15-60us022531225421us