Kwezinhlobo ezine ezivamile zezinzwa zokushisa - Thermocoumpules, amadivaysi okushisa okumelana, izindawo zokuvimbela ukumelana kanye nezinzwa zokushisa ics - Izinga lokushisa ics liyindlela enhle yokuthola usizo lwezokwelapha kanye nezempilo. Ngokuyinhloko-ke, abadingi ukulinganiselwa, banikeza ukungavikeki kahle komsindo futhi kulula kakhulu ukuhlanganisa amadivayisi wezempilo aphathekayo futhi agqokekayo. Ngokuzwela okungenamsoco, ama-thermometer angenamkhawulo angasetshenziswa.
Amapharamitha asemqoka asayizi, ukusetshenziswa kwamandla kanye nokuzwela okushisayo. Okokugcina kubalulekile ukunemba kwebanga lemitholampilo ngoba ngisho namandla esikhashana (μw) angashisa inzwa futhi adale ukufundwa okungalungile. Okunye ukucatshangelwa luhlobo lwe-interface (idijithali noma i-analogue), oluzonquma izingxenye ezihambisanayo, njenge-microcontroller.
Ukunemba kwebanga lemitholampilo
Ukuhlangabezana nokunemba kwebanga le-Clinical-grade, nge-ASTM E112 (Izindlela ezijwayelekile zokuhlola zokunquma ubukhulu bokusanhlamvu), kuqala ngenzwa efanelekile. Izinzwa zokushisa ezihlanganisiwe ze-Maxim (I-Maxim Ehlanganisiwe yatholwa ngamadivayisi we-analog ngo-Agasti 2021.) Amadivayisi alinganisa 2x2x0.75mm futhi asephaketheni elincanyana le-10Pin LGA (Umdwebo 1). I-ICS isebenza kusuka kumandla kagesi onikezayo we-1.7v-3.6V futhi idla ngaphansi kwama-67μa ekusebenzeni no-0.5μ kokubekwe eceleni.
Kubalulekile ukuthi izinga lokushisa lezinzwa lingatholeli ukufundwa kwensiza egqoke. Ukushisa kwe-Sensor IC, okuhamba kusuka kwi-PCB ngokusebenzisa iphakheji, kuholela enzwa kufa futhi kungathinta ukunemba. Enzweni lokushisa le-IC, lokhu kushisa kwenziwa nge-metal thermal pad engxenyeni engaphansi yephakheji, okuholela ekushiseni kwe-parasitic. Lokhu kungadala ukuhunyushwa okushisayo ngaphakathi nangaphandle kwezinye izikhonkwane, kuphazamisa izilinganiso zokushisa.
Kunamasu ambalwa wokulwa nokushisa kwesinambuzane. Imibala emincane ingasetshenziswa ukunciphisa ukwenza okushisayo kude ne-sensor IC. Abaqambi bangalinganisa izinga lokushisa phezulu kwephakheji, kude kakhulu ngangokunokwenzeka kusuka kuma-IC PINs, kunokuba usebenzise i-Thermal Pad. Lokhu kunjalo ngeMax30208CLB + nezinye izinzwa zokushisa zedijithali zedijithali.
Enye inketho ukubeka ezinye izakhi ze-elekthronikhi kude kude nento ezwakalayo ngangokunokwenzeka ukunciphisa umthelela wazo ekulinganiseni izinga lokushisa.
Ukucatshangelwa Kwedizayini Yezinkathazo
Ukuqinisekisa ukuhlukaniswa okushisayo kusuka emithonjeni yokushisa kumadivaysi agqokekayo kumele kube yindlela enhle yokushisa phakathi kwento yokuzwa ukushisa kanye nesikhumba somsebenzisi. Indawo engaphansi kwephakheji yenza kube yinselele ye-PCB ukuthi ilandelwe amathrekhi wensimbi ukusuka endaweni yokuxhumana nomzimba.
Uhlelo kufanele lwenzelwe ukuze inzwa isondele ngangokunokwenzeka ekushiseni okuhlosiwe ukuthi lilinganiswe. Usebenzisa izinzwa ezi-max30208, ukwakheka okugqokekayo kanye nama-patches wezokwelapha angasebenzisa ama-pc aguquguqukayo noma aqinile. Izinzwa zokushisa ze-max30208 zedijithali zingaxhunywa ngqo ku-microcontroller zisebenzisa ikhebula eliguqukayo noma ikhebula lephrinta eliphansi.
Kubalulekile ukubeka inzwa yokushisa i-IC ohlangothini lwe-PCB, olunciphisa ukumelana okushisayo phakathi kobuso besikhumba nenzwa. Abaqambi kufanele futhi banciphise ubukhulu bebhodi eguqukayo ukuze baguquke kahle futhi baxhumana kangcono.
Izinzwa zokushisa zedijithali zivame ukuxhunyaniswa nama-microcontroller nge-I2C serial interface. I-Maxim's Max30208CLB +, ngokwesibonelo, isebenzisa igama elingama-32 okokuqala ukuze kwakhiwe irejista yokusetha sesethi yokushisa okufika ku-32 lokushisa lokushisa, ngalinye lihlanganisa amabhayithi amabili. Lokhu kuvumela i-microcontroller ukuthi ilale isikhathi eside ukuze ilondoloze amandla (Umdwebo 2). Amarejista wememori-map avumela izinzwa ukuthi zinikeze ama-alamu wokushisa wedijithali aphezulu futhi aphansi.
I-PIN yokufaka inhloso ejwayelekile / ukuphuma kwe-PIN ingalungiswa ukuze ivuse ukuguqulwa kokushisa kanti okunye okulungiselelwe ukukhiqiza ukuphazamiseka kwezikhathi ezikhethiwe zesimo.
Ukulinganisa kwefekthri
Izinzwa eziningi zokushisa zedijithali zilinganiselwe efektri, ziqeda isidingo sokuphinda ziphinde zibe unyaka, njengoba kunjalo nangezinzwa zokushisa ze-legacy eziningi. Lokhu kudlula isidingo sokuhlakulela isoftware ukuvumelanisa okukhiphayo, futhi kulingisa futhi kube nokwenza kahle umjikelezo. Ngokwengeziwe, kuqeda isidingo sezinto eziningi zokunemba futhi kunciphisa ubungozi bokuphazamiseka kokulimala.
Umndeni wakwa-AS621X wezinzwa zokushisa ezivela kuma-AMS yi-Factory Clibrated futhi uhlanganise ukuhlanganiswa (Umdwebo 3). Iphinde ibe namakheli ayisishiyagalombili e-I2C wokuqapha amazinga okushisa ngezindawo eziyisishiyagalombili ezishisayo ezishisayo ngebhasi elilodwa. I-serial interface namakheli amaningi we-I2C enza ukuqinisekiswa kokubonisa nokuklama kube lula.
Izinguqulo zinembile ku- ± 0.2 ° C, ± 0.4 ° C no ± 0.8 ° C ziyatholakala. Okwezinhlelo ezihlobene nezempilo, ukunemba ngaphakathi kwe- ± 0.2 ° C kwanele (The as6212-awlt-l). Wonke amadivaysi angu-AS621X anesinqumo se-16bit ukuthola ukuhlukahluka okuncane ekushiseni ngaphezulu kwe-40 ° C kuya ku- + 125 ° C ukusebenzisa ibanga.
I-AS621X ikala 1.5mm2 futhi iza kwiphakheji yesilinganiso se-chip selvel chip. Ukuhlinzekwa kwamandla kagesi kungu-1.71V ngokusetshenziswa kwe-6μaka ngesikhathi sokusebenza kanye no-0.1μ ngokubekwe eceleni, okwenza i-as6212-awlt-l ikakhulukazi efaneleka izinhlelo zokusebenza ezinamandla ebhethri.
Izinzwa zokushisa ezingenakuxhumana
Ama-thermometer we-infrared efremeter enza izilinganiso zokushisa ezingalandelwanga zokushisa okukhona nokushisa kwento.
Ama-thermometereter anjalo athola amandla angenhla kwe-0 Kelvin (ngokuphelele zero) ekhishwe yinto ephambi kwensiza. Umtshina uguqula amandla abe yisiginali kagesi futhi adlulisele kwiprosesa ukutolika nokubonisa imininingwane ngemuva kokunxephezela ukuhlukahluka okubangelwa ukushiyeka okukhona.
Isibonelo yi-Thermometer ye-MLX90614ESF-BCH-000-tu infrared thermometer evela kuMethexis. Kuhlanganisa i-chip ye-thermopile ye-infrared infrared ne-chip yesiginali ehlanganiswe kwiphakheji le-to-39 (Umdwebo 4). Kukhona futhi i-amplifier yomsindo ephansi, i-analogue engu-17-bit kuya kwi-Digital Converter kanye ne-processor yesiginali yedijithali yokunemba nokuxazulula.
Ama-thermometereters we-infrared armometer alinganiselwe efektri yokushisa eyi-40 ° C kuye ku-85 ° C (ambient) no -70 ° C kuya ku-382.2 ° C yokushisa kwento. Ukunemba okujwayelekile kungu-0.5 ° C ekushiseni kwegumbi.
I-sensor iyindlela yokuzikhandla ekhethiwe yedijithali futhi inesinqumo sika-0.02 ° C. Ngenye indlela, abaklami bangahlelela i-10bit Pulse Width Modaution (PWM) okukhiphayo kwedijithali ngesinqumo sika-0,14 ° C.
Ukwesekwa kwentuthuko
Izinzwa zeMax30208 zisekelwa uhlelo lokuhlola oluMax302080VSYS #, olubandakanya i-Flex PCB ukubamba i-Max30208 yokushisa inzwa ye-IC (Umdwebo 5). Ibhodi le-microcontroller le-max32630fthrthroller kanye nebhodi le-max30208 le-interface lixhunyiwe ngezihloko. Ihadiwe yokuhlola ingaxhunywa kwi-PC isebenzisa ikhebula le-USB elinikeziwe. Uhlelo luzobe selufaka ngokuzenzakalela abashayeli bedivayisi edingekayo belilungele isoftware ye-EV Kit ezolandwa.
Ukulinganisa izinga lokushisa lomzimba ezindaweni eziningi, amazinga okushisa angu-Max30208 angaxhunywa ngamakheli we-I2C ehlelweni lwe-daisy-chain elungiselelweni lebhethri elilodwa futhi lisingatha i-microcontroller. Inzwa ngayinye yokushisa ivotelwe yi-microcontroller njalo ukudala iphrofayili yomabili lokushisa lomzimba kanye nomzimba wonke.
Onjiniyela bangasebenzisa i-Mikroe-1362 Irthermo clicl Bhodi kusuka kuMikroelektroka ukuze basebenzise inzwa ye-MLX90614 infrared.Lokhu kuxhumanisa imodyuli ye-thermometer ye-mlx90614eSf-AAA
Ibhodi le-5V lilinganiselwe ku-40 ° C kuya ku-85 ° C izinga lokushisa elikhona futhi -70 ° C kuya ku-380 ° C.
