DS18B20????????????
?????????DS18B20???д????????????DS1820??????????????????λ????????????????????????????????????2s???750ms?? DS18B20??????????3???????е??????????????????????????С?????????????????????????????????1???????????????????仯?????????????????????????????????2????????????????1????????????????-55?????????????????????????1???????????????????????????м?????????????????1??????????0?????????????????1????????1?????????±??????????1?????????????????????????????????м????????????????????2??????0??????????????????????????????е???????????????б????????????????????????????е??????????????????????????1???????? [2]
?????????
1????????????????
??? ??????????????DS18B20???????????????????????????????????????????DS18B20?????????
?? ?????·?Χ ??55?桫+125?棬???в????????????????????????
???????1?檔
????????????????????DS18B20?????????Ψ???????????????????8????????????????????????????????????????????????????????????
??????????: 3.0~5.5V/DC ????????????????????
?? ????????в?????κ???Χ???
??? ?????????9~12λ????????????д???
?? ??????????????? ??6
?? ????????DN15~25, DN40~DN250????????????????С????豸????
?? ?????????? M10X1, M12X1.5, G1/2?????
?? ??PVC????????????????????г???,???????????????豸?????
DS18B20+ ?? Maxim Integrated ??? [1]
Manufactured by Maxim Integrated, DS18B20+ is a ????????.
??÷?Χ??
?ò????????????????????????????????????????????????????????????
????????壬??????????????С??乤??豸?????????
????????????????????е??????????
????/????????????????????????????????????????????????
??????
?? ?? ???·?Χ ??????? ??????? ???ù??
TS-18B20 -55~125 ?? 1.5 m
TS-18B20A -55~125 M10X1 1.5m DN15~25
TS-18B20B -55~125 1/2??G ????? DN40~ 60
?????????
???????
????????????棬??????????????????????????п?????????????????????????????????85?????????????н?????????????????????????????????????????????????ú????85?檔??????????51??????????????м??????????????4.7K??10K?????????裬???????????????????????/??????????????????85?棬???ü???????????85?????????????????
???
????????????????????????? ????????????????????????? ????????? ??????????????磬?????Χ?3.0 V??5.5 V ???豸???? ????????Χ?-55 ?? C??+125 ?? ????????????-67 ?? F??257?? F?????????-10 ?? C??+85 ?? C??Χ????????0.5 ?? C
??????????????????9~12λ?????????12λ???????????750????????????????????????????????÷?Χ????????????????????????????????????κ?????????
??????DS18B20????????????9??12λ???????豸??????)??????DS18B20??????????????????????????????DS18B20?????????????????????д???????????????????????????????????????????? ???????DS18B20????????????????????ds18b20s?????????????????????????????????????????????????????????????????????????????в??????????豸????????????й??????????
DS18B20????????????????????????????????????ROM?趨??????????????????????á????????????????????????? 1 ????ROM?? 2 ??ROM??? 3 ??????ROM?? 4 ??????ROM?? 5 ????????顣??Щ????????????????????????64λ???ROM???к?????????????????????????????????????????????????????????????ж???????????豸??
??????????DS18B20???????????????洢??DS18B20??洢???????????????????DS18B20???????????????????????????DS18B20????У???????????????????书??????????????????洢????????????????TH??TL????????EEPROM ??????????DS18B20????????????????Щ????????????????????????????????????????????????????????????????дTH,TL???????????????????????书????????ɡ???????????????????????????????д????????λ?????
??????????
?洢??
DS18B20??洢???????????????RAM???????RAM????????RAM?????????????TH??TL???????????ü???????洢???????????????????????????????д???????????д???????????????????????????????????????Щ??????????????????????????????????????Щ??????????????RAM?С?????????????е??????????????????????????????
?????????RAM????8??????洢????????????????????????????????????????????????????????У?顣??
64-λ???ROM
64λ???ROM???8λ??DS18B20??????????????????48λ??????????????????8λ????56λ??CRCУ?顣64-λ????ROM?????5??ROM???????????ROM?????ROM?????ROM??????ROM??????????
???????????
DS18B20????????????VDD?????????????????????????VDD????3.0V??5.5V???????????????????VDD?????????????????????????????????????????????????磬I/O???????5K??????????????衣
???ü????
???ü?????????ò????λ?????????????????????
???????R1??R0?????????λ????R1??R0???????????????9λ??10λ??11λ??12λ?????????????????????????????????λ?????????????????????????????0.5?棬0.25?棬0.125???0.0625?棬????????????12λ??
??????
DS18B20?????????????12λ??????????????16λ???5??λ?????λ?????5λ?1?????????????????????5λ?0?????????????????????????????????????16???????????10??????ɡ????????????????????16??????????1?????????10??????ɡ?????0550H = +85 ???FC90H = -55 ???
?????????
DS18B20?????????????????4.1?????
??4.1 ?DS18B20??????????????
? ?? ??????? ?? ?? ? ??
?????? 44H ????DS18B20??????????
??????? BEH ???????9????????????
д????? 4EH ??????д?????????TH??TL???
????????? 48H ?????????TH??TL???д??E2PROM??
?????E2PROM B8H ??E2PROM?е?TH??TL???д???????TH??TL???
????????緽? B4H ????DS18B20?????????緽?????????CPU
?????
??1?? ????????????????1????
??2?? ??????????????????????????????????
??3?? ????????????????0????
??4?? ???750????????????Χ?????480??960?????
??5?? ????????????????1????
??6?? ???????????????????????15??60?????????????????DS18B20????????????0???????????????????????????????????????????е????????????????????????????????г?????????
??7?? ??CPU????????????????????0??????????????????????????????????????5??????????????????480???
??8?? ??????????????????????1?????????
????????4.13?????
?4.13 ?????????
д????
??1?? ???????????????0????
??2?? ????????????15???
??3?? ?????λ????λ????????????????????λ????
??4?? ???????45???
??5?? ??????????????????
??6?? ??????1??????6?????????????е?????????????????
??7?? ??????????????
DS18B20??д???????????4.14?????
?4.14 DS18B20??д????????
??????
??1???????????????1????
??2?????2???
??3???????????????0????
??4?????3???
??5???????????????1????
??6?????5???
??7????????????????1????λ?????????????????
??8?????60???
DS18B20??????????????4.15?????
?1.15 DS18B20????????
?????????
1??DS18B20?????????
1.1??????????Χ???????????Χ??3.0??5.5V???????????????????? ???????
1.2????????????????DS18B20???????????????????????????????????????????DS18B20???????
1.3?? DS18B20?????????????????DS18B20?????????Ψ???????????????????????
1.4??DS18B20??????в?????κ???Χ???????? ??????????????·???????????????????????·??
1.5???·?Χ??55?桫+125?棬??-10??+85??????????0.5??
1.6?????? ???????9??12λ????????????????0.5?桢0.25?桢0.125???0.0625?棬????????????
1.7????9λ??????????? 93.75ms???????????????12λ???????????750ms??????????????????????
1.8????????????????????????????"? ??????"???д????CPU?????????CRCУ???????м????????????????
1.9??????????????????????о?????????????? ????????????????
2??DS18B20?????κ??????
DS18B20???????????????????64λ???ROM ??????????????????????????????TH??TL?????ü??????
DS18B20?????μ?????????????1:
DS18B20??????壺
(1)DQ????????????/??????
(2)GND???????
(3)VDD????????????????????????????????????
?2??DS18B20??????
3??DS18B20???????
DS18B20???д????????????DS1820??????????????????λ????????????????????????????????????2s ???750ms?????????????? ?????仯????????????????????????????????2????????????????1?????????????????55?????????????????????????1?? ??????????????????????????м?????????????????1??????????0?????????????????1????????1?????????±??????????1?? ???????????????????????????????м????????????????????2??????0??????????????????????????????е?????? ??????????3?е?б????????????????????????????е??????????????????????????1????????
?3??DS18B20??????????
DS18B20??4????????????????
??1?????ROM?е?64λ???к???????????????????????????DS18B20??????????64λ???ROM????????????8λ ??28H??????????????????48λ???DS18B20?????????к?????8λ?????56λ?????????У????CRC=X8+X5+X4+1???????ROM?????? ???????DS18B20????????????????????????????????????DS18B20??????
??2??DS18B20?е??????????????????????????12λ??????????16λ????????????????????????????? 0.0625??/LSB???????????S?????λ??
??1: DS18B20?????????
????12λ?????????12λ??????洢??18B20??????8?????RAM?У????????е????5λ?????λ???????????????0?? ??5λ?0?????????????????0.0625???????????????????С??0????5λ?1?????????????????1?????0.0625????????? ???? ????+125???????????07D0H??+25.0625???????????0191H??-25.0625???????????FE6FH??-55???????????FC90H ??
??2: DS18B20????????
??3??DS18B20??????????洢?? DS18B20??????????????洢????????????????RAM????????????????????EEPRAM,???????????????????? TH??TL??????????
??4?????ü???? ??????λ???????????
??3?????ü??????
TM
R1
R0
1
1
1
1
1
????λ??????"1"??TM???????λ??????????DS18B20??????????????????????DS18B20???????λ???????0???? ???????????R1??R0???????÷????????±????????DS18B20????????????12λ??
??4??????????????
R1
R0
?????
????????????
0
0
9λ
93.75ms
0
1
10λ
187.5ms
1
0
11λ
375ms
1
1
12λ
750ms
4?????????洢?????????洢????9?????????????????5??????????????????????????????????????????????????? ???????洢?????0???1??????????????????????????????????????λ???????λ????????????1???????????????? ??????λS=0?????????????λ????????????S=1?????????????????????????????? 2?????????????????????????? ???????????
??5??DS18B20??????????
?????????
?????
??????λ ??LS Byte??
0
??????λ ??MS Byte??
1
?????????TH??
2
?????????TL??
3
???ü????
4
????
5
????
6
????
7
CRCУ???
8
????DS18B20????Э?飬?????????????????DS18B20??????????????????????裺???ζ?д???????DS18B20???? ??λ????????λ??????????ROM????????RAM????????????DS18B20????????????????λ?????CPU????????????500?????? ??????DS18B20?????????16??60???????????60??240???????????壬??CPU????????????λ?????
??6??ROM????
? ??
???????
?? ??
??ROM
33H
??DS1820????????ROM?е??????64λ?????
???? ROM
55H
??????????????????? 64 λ ROM ??????????????????????????? DS1820 ???????????????????? DS1820 ???д???????
???? ROM
0FOH
???????????????????? DS1820 ?????????? 64 λ ROM ?????????????????????????
???? ROM
0CCH
???? 64 λ ROM ?????????? DS1820 ?????任???䶮??????????????
?澯????????
0ECH
??к???????????趨????????????????????????
??6??RAM????
? ??
???????
?? ??
???任
44H
????DS1820????????????12λ???????750ms??9λ?93.75ms??????????????9???RAM?С?
???????
0BEH
?????RAM??9????????
д?????
4EH
?????????RAM??3??4???д???????????????????????????????????????????????
?????????
48H
??RAM?е?3 ??4????????????EEPROM?С?
??? EEPROM
0B8H
??EEPROM??????????RAM?е??2??3????
?????緽?
0B4H
??DS1820??????????????????DS1820????? 0 ????????????? DS1820????? 1 ????
5??DS18B20??????·DS18B20?????????в???????????????????????????????????????????DS18B20?????????÷????? ?????·???
5.1??DS18B20??????????緽???·????????4????????????????緽????DS18B20???????????????????????????DQ???????????????????????? ??????????????????????????????????????????????????????????????????????硣
?????????????????????????
1????????????????????豾????
2??????????г???????????????ROM
3????·?????????????I/O????????
????DS18B20???о????????????I/O??????????????????????????????? ?????DS18B20??????????乤????????1mA????????????????????????I/O??????ж???????????4.7K?????????????????? ?????????????????????????????
?????4??·??????????????????????????????????????????????С??? ????????VCC???????5V????????????????????????????????????????????????????
?4
?4
5.2??DS18B20???????????????緽???·???????????????緽????????5?????????DS18B20????????????л??????????????????????????????? E2?洢???????????MOSFET??I/O?????????VCC????????????????????κ??漰????????E2?洢??????????????????????????? ??10??S???I/O???????????????????????????????????????????????????????????????????? ??????????????I/O?????????????л???
?5
?5
?5
??????4???5??????????緽??У?DS18B20??VDD?????????
5.3??DS18B20??????????緽?
??????????緽????DS18B20?????????VDD??????????I/O???????????????????????????????????????? ?????????????????????????????????DS18B20?????????????????????????????????????DS18B20??GND??????????? ???????????????????????????85?档
?6???????緽?????????·
?6
?6
.
.
.
.
.
?7???????緽?????????·?
?7
?7
????????緽???DS18B20??????????????????????????????????????????·???????????????????????????? ??????????????????????????????????緽????????????????????????VCC?????????????????? ?????????DS18B20??????????Χ??????????????VCC????3V??????????????????????
6??DS1820????????????
DS1820??????в???????????????????????????????????????????????????????????????????
6.1????С??????????????????????????в?????????DS1820???????????????????????????? ?????DS1820???ж?д??????????????????д?????????????????????????PL/M??C????????????????????????? DS1820??????????ò?????????????
6.2????DS1820???й??????о?δ??????????????DS1820??????????????????????????????? DS1820???????????в?????????????????????DS1820????8???????????????????????????????????????????ж??????????? ????????
6.3??????DS1820????????????г??????????????У????????????????????????50m???????? ??????????????????????????????????????ε??????????????????150m??????????????????????????????ε???????? ???????????????????????????????????????????????β????????????????????DS1820???г??????????????????? ??????????????迹???????
6.4????DS1820???????????У???DS1820????????????????????????DS1820???????????? ???DS1820?????????????????????DS1820???????з???????????????????????????????DS1820?????????????????????? ?????????? ???????????????????4о?????????????????????????????????VCC?????????β????????????
????????
????DS18B20?????????????
????DS18B20????????????????????????0.1??????????????Χ???20???+100???????8λ
????????????
????admin ?????????2019-12-17
