Raspberry Pi SC1631 Raspberry Microcontroller Incwadi yokufundisa

Isahluko 1: Intshayelelo
Uluhlu lwe-RP2350 lubonelela ngeendlela ezahlukeneyo zephakheji xa kuthelekiswa nochungechunge lwe-RP2040. I-RP2350A kunye ne-RP2354A ziza kwiphakheji ye-QFN-60 ngaphandle kunye nokugcinwa kwe-flash yangaphakathi ngokulandelelana, ngelixa i-RP2354B kunye ne-RP2350B beza kwiphakheji ye-QFN-80 kunye nangaphandle kokugcinwa kwe-flash.

Isahluko 2: Amandla
Uluhlu lwe-RP2350 lubonisa ivolthi entsha yokutshintsha kwi-chiptage umlawuli kunye nezikhonkwane ezintlanu. Lo mlawuli ufuna amacandelo angaphandle ukuze asebenze kodwa unikezela ngobuchule obuphezulu bamandla kwimisinga yomthwalo ophezulu xa kuthelekiswa nomlawuli womgca kuthotho lwe-RP2040. Nika ingqalelo kubuzaza bengxolo kwi-VREG_AVDD pin ebonelela ngokujikeleza kwe-analogue.

Imibuzo Ebuzwa Rhoqo (FAQ)

Q: Yintoni umahluko ophambili phakathi RP2350A kunye RP2350B?
A: Umahluko ophambili ukho kubukho bokugcinwa kweflash yangaphakathi. I-RP2350A ayinayo ukugcinwa kwe-flash yangaphakathi ngelixa i-RP2350B isenza.
Q: Zingaphi izikhonkwane ezenziwa umqulutage umlawuli kuthotho RP2350 babe?
A: Umqulutage umlawuli kuthotho RP2350 has izikhonkwane ezintlanu.

Uyilo lweHardware ngeRP2350 Ukusebenzisa i-RP2350 microcontrollers ukwakha iibhodi kunye neemveliso

eColophon

Olu xwebhu lunikwe ilayisenisi phantsi kwe-Creative Commons Attribution-NoDerivatives 4.0 International (CC BY-ND). Umhla wokwakha: 2024-08-08 inguqulelo yokwakha: c0acc5b-ecocekileyo
Isaziso esisemthethweni sokuzihlangula

IDATHA YOBUGCISA NEENKONZO YEEMVELISO ZERASPBERRY PI (KUQUKA IIDAASHETHI) NJENGOKO ZILUNGISWE NGAMAXESHA NGETHUBA (“IZIBONELELO”) ZINIKEZELWA YI-RASPBERRY PI LTD (“RPL”) “NJENGOKO ZINJALO” KUNYE NAYO NAYIPHI NA INKCAZELO OKANYE OKUNGABAXEKIYO, UNGAHLANGANISIWEYO, UKUYA, IZIQINISEKISO EZIXINWEYO ZOKURHWEBA NOKULUNGELA NGENJONGO ETHILE ZIXINWE. NGENXA EYENZAYO EKUVUNYIWE NGAYO UMTHETHO OSEBENZAYO KUKHO AKUKHO SIGANEKO I-RPL AYIYI KUTHWALAPHA NALUPHI NA INDLELA ETHILE, ENGACHAPHAZANGA, ESAYISEhlo, EZIKHETHEKILEYO, OMZEKELO, OKANYE OKUPHUMELELEYO (KUbandakanywa, KODWA AKUNIKEZELWA MTHETHO, UKUNIKEZELWA KOMTHETHO; , OKANYE IINZUZO OKANYE UKUPHAZAMISEKA KWESHISHINI) NANGONA NAKUMBI KUBANGELEKILEYO KUNYE NAKUYAYIPHI NA ITHIYORI YOBUXHOXO, ENOBA KUKWEMVUMELWANO, UXANDUVA OLUQINISEKILEYO, OKANYE UKUBANDAKANYA KUNGAKHATHALISEKI OKANYE NGENXA YOKUFAKA NGAYO NAYIPHI NA IINDLELA EZIPHUMA KWISIBONELELO SOKUSETYENZISWA KWESINXEKO UMONAKALO OLULO.
I-RPL inelungelo lokwenza naluphi na uphuculo, uphuculo, izilungiso okanye naluphi na olunye uhlengahlengiso kwi-RESOURCES okanye naziphi na iimveliso ezichazwe kuzo nangaliphi na ixesha kwaye ngaphandle kwesaziso esongezelelweyo.
I-RESOURCES yenzelwe abasebenzisi abanezakhono abanamanqanaba afanelekileyo olwazi loyilo. Abasebenzisi banoxanduva kuphela lokukhetha kunye nokusetyenziswa kwe-RESOURCES kunye naluphi na usetyenziso lweemveliso ezichazwe kuzo. Umsebenzisi uyavuma ukuhlawula kunye nokubamba i-RPL ingenabungozi kuwo onke amatyala, iindleko, umonakalo okanye enye ilahleko evela kusetyenziso lwabo lwe-RESOURCES.

I-RPL inika abasebenzisi imvume yokusebenzisa i-RESOURCES kuphela ngokudibana neemveliso zeRaspberry Pi. Konke okunye ukusetyenziswa kwe-RESOURCES akuvumelekanga. Akukho layisenisi inikwa nayiphi na enye i-RPL okanye elinye ilungelo lepropathi enomgangatho ophezulu wokuqonda.
IMISEBENZI YOMNGCIPHEKO OMKHULU. Iimveliso zeRaspberry Pi aziyilwanga, zenziwe okanye zenzelwe ukusetyenziswa kwiindawo ezinobungozi ezifuna ukungaphumeleli kokusebenza okukhuselekileyo, njengakukusebenza kwezixhobo zenyukliya, ukukhangela inqwelomoya okanye iinkqubo zonxibelelwano, ulawulo lwezithuthi zomoya, izixhobo zezixhobo okanye izicelo ezibalulekileyo zokhuseleko (kubandakanya inkxaso yobomi. iinkqubo kunye nezinye izixhobo zonyango), apho ukungaphumeleli kweemveliso kunokukhokelela ekufeni ngokuthe ngqo, ukwenzakala komntu okanye umonakalo omkhulu womzimba okanye wokusingqongileyo ("ImiSebenzi yoMngcipheko oPhezulu"). I-RPL ayibangi ngokungqalileyo nayiphi na iwaranti echaziweyo okanye echaziweyo yokufaneleka kwiMisebenzi yoMngcipheko oMkhulu kwaye ayamkeli xanduva lokusebenzisa okanye ukubandakanywa kweemveliso zeRaspberry Pi kwiMisebenzi yoMngcipheko oMkhulu.

Iimveliso zeRaspberry Pi zinikezelwa ngokuxhomekeke kwiMigaqo eMiselweyo yeRPL. Ubonelelo lwe-RPL lwe-RESOURCES alunandisi okanye luyiguqule ngenye indlela iMigaqo eMigangatho ye-RPL kuquka kodwa ingaphelelanga kwizithintelo kunye neziqinisekiso ezichazwe kuzo.

Isahluko 1. Intshayelelo

Umfanekiso 1. Unikezelo lwe-KiCad 3D ye-RP2350A yoyilo oluncinci example

Xa sasiqala ukwazisa iRaspberry Pi RP2040, saphinda sakhupha i-'Minimal' design example kunye nesikhokelo esikhaphayo Uyilo lwe-Hardware kunye ne-RP2040 echaza ngethemba ukuba i-RP2040 ingasetyenziswa njani kwibhodi yesekethe elula, kwaye kutheni ukhetho lwamacandelo ahlukeneyo lwenziwa. Ngokufika kothotho lwe-RP235x, lixesha lokuphinda undwendwele i-RP2040 yoyilo oluNcinci oluncinci, kwaye uyihlaziye ukuze i-akhawunti yeempawu ezintsha, kunye nokwahluka kwephakheji nganye; i RP2350A nephakheji yayo QFN-60, kunye RP2350B leyo QFN-80. Kwakhona, olu yilo lukwifomathi ye-Kicad (7.0), kwaye ziyafumaneka ukukhuphela (https://datasheets.raspberrypi.com/rp2350/Minimal-KiCAD.zip).

IBhodi eNcinane
Ibhodi eNcinane yoqobo yayilinge lokubonelela ngoyilo olulula lwereferensi, kusetyenziswa ubuncinci obuncinane bamacandelo angaphandle afunekayo ukuqhuba i-RP2040 kwaye isenayo yonke i-IO eveziweyo kwaye iyafikeleleka. Oku kwakuqulethwe ngumthombo wamandla (i-5V ukuya kwi-3.3V ye-linear regulator), i-crystal oscillator, imemori ye-flash, kunye noqhagamshelwano lwe-IO (i-micro USB socket kunye ne-GPIO headers). Uluhlu olutsha lwe-RP235x Iibhodi ezincinci ziyafana, kodwa ngolunye utshintsho oluyimfuneko ngenxa ye-hardware entsha. Ukongeza koku, kwaye ngaphandle kokuhamba ngokuchasene nendalo encinci yoyilo, ndongeze amaqhosha ambalwa e-bootsel kwaye abaleke, kunye nentloko eyahlukileyo ye-SWD, ethetha ukuba ngamava okulungisa ingxaki aphantsi kakhulu ngeli xesha. Uyilo alufuni ngokungqongqo la maqhosha, iimpawu zisafumaneka kwiiheda, kwaye zinokushiyeka ukuba uxabisa kakhulu okanye uqaphela indawo, okanye unotyekelo lwe-masochistic.

RP2040 vs RP235x series
Olona tshintsho lucacileyo lukwiipakethe. Ngelixa i-RP2040 iyi-7x7mm QFN-56, uthotho lwe-RP235x okwangoku inamalungu amane awohlukeneyo. Kukho izixhobo ezibini ezabelana ngephakheji efanayo ye-QFN-60; i RP2350A engaqulathanga ugcino flash lwangaphakathi, kunye RP2354A leyo eyenza. Ngokufanayo, i-QFN-80 nayo iza kwiincasa ezimbini; i RP2354B nge flash, kunye RP2350B ngaphandle. Izixhobo ze-QFN-60 kunye ne-RP2040 yokuqala yabelana nge-heri eqhelekileyotage.

Nganye ineeGPIO ezingama-30, ezine kuzo zikwaqhagamshelwe kwi-ADC, kwaye ziyi-7x7mm ngobukhulu. Ngaphandle koku, i-RP2350A ayisiyonto i-drop-in replacement ye-RP2040, njengoko inani leephini ngalinye lahlukile. Ngokwahlukileyo, iitshiphusi ze-QFN-80 ngoku zine-48 GPIOs, kwaye ezisibhozo kwezi ziyakwazi i-ADC. Ngenxa yoku, ngoku sineebhodi ezimbini ezincinci; enye yezixhobo ze-pin ezingama-60, kunye nenye yezingama-80. Ezi bhodi ziNcinane ziyilelwe ubukhulu becala iindawo ngaphandle kokukhanya kwangaphakathi (RP2350), nangona kunjalo uyilo lunokusetyenziswa ngokulula kunye nezixhobo zokukhanyisa zangaphakathi (RP2354) ngokushiya ngokulula isibane esingaphakathi. imemori, okanye uyisebenzise njengesixhobo esinomenzi wesibini (ngaphezulu koku kamva). Kukho umahluko omncinci phakathi kweebhodi ezimbini, ngaphandle kokuba i-QFN-80 version inemigca emide yeeheader ukulungiselela i-GPIO eyongezelelweyo, kwaye ibhodi ke ngoko inkulu.

Ngaphandle kwephakheji, umahluko omkhulu webhodi-leveli phakathi kochungechunge lwe-RP235x kunye ne-RP2040 zizixhobo zamandla. Uluhlu lwe-RP235x lunezikhonkwane ezintsha zamandla, kunye nomlawuli wangaphakathi owahlukileyo. I-100mA ye-linear regulator ye-RP2040 iye yathatyathelwa indawo ye-200mA switching regulator, kwaye ngenxa yoko, ifuna i-circuitry ethe ngqo, kwaye akukho nkathalo incinci ithathwayo ngokuyila. Kucetyiswa kakhulu ukuba ulandele ngokusondeleyo uyilo lwethu kunye nokukhethwa kwecandelo; sele sidlulile kwintlungu yokuba senze uphinda-phindo oluninzi loyilo, ke ngethemba akunyanzelekanga ukuba wenze njalo.

Umfanekiso 2. Unikezelo lwe-KiCad 3D ye-RP2350B yoyilo oluncinane example

Uyilo
Injongo yoyilo oluncinci exampLes kukwenza iperi yeebhodi ezilula usebenzisa uthotho lwe RP235x, ekufuneka lufikeleleke kwaye lube lula ukwenziwa, ngaphandle kokusebenzisa ubugcisa obungaqhelekanga bePCB obungeyomfuneko. Iibhodi ezincinci ke ngoko ziyi-2 zoyilo, zisebenzisa amacandelo ekufuneka afumaneke ngokuqhelekileyo, kwaye zonke zixhonywe kwicala eliphezulu lebhodi. Ngelixa kuya kuba kuhle ukusebenzisa izinto ezinkulu, ezikwazi ukuthengisa ngesandla ngokulula, i-pitch encinci yeetshiphusi ze-QFN (0.4mm) ithetha ukuba ukusebenzisa ezinye ze-0402 (1005 metric) iikhomponenti ze-passive akunakuphepheka ukuba zonke ii-GPIOs ziya kusetyenziswa. Ngelixa i-soldering ye-0402 yesandla ingenamceli mngeni kakhulu ngentsimbi enesidima, kuphantse ukuba akunakwenzeka ukuthengisa ii-QFNs ngaphandle kwezixhobo zeengcali.

Kula macandelo ambalwa alandelayo, ndiza kuzama ukucacisa ukuba yeyantoni na isekethe eyongezelelweyo, kwaye ngethemba lokuba senze njani ukuze senze ukhetho esilwenzileyo. Njengoko ndizakube ndithetha ngoyilo olubini olwahlukeneyo, enye yesayizi yephakheji nganye, ndizamile ukugcina izinto zilula kangangoko ndinako. Kangangoko kunokwenzeka, zonke iireferensi zecandelo leebhodi ezimbini ziyafana, ke ukuba ndibhekisa ku-U1, R1, njalo njalo, ngoko inxulumene ngokulinganayo kuzo zombini iibhodi. Ukungafani okucacileyo kuxa icandelo likwibhodi enye kuphela (kuzo zonke iimeko, oku kuya kuba kuluhlu olukhulu lwe-80 pin), ke icandelo elichaphazelekayo liya kuba kuphela kwi-design ye-QFN-80; umzekeloample, i-R13 ivela kule bhodi kuphela.

Isahluko 2. Amandla

Amandla ombane ochungechunge lwe-RP235x kunye ne-RP2040 ahluke ngandlel' ithile ngeli xesha, nangona kuqwalaselo lwayo olulula, kusafuna izinto ezimbini, i-3.3V kunye ne-1.1V. Uluhlu lwe-RP235x ngaxeshanye lulambe amandla ngakumbi, njengoko lusebenza phezulu, kwaye luyonga ngakumbi (xa lukwimeko yamandla aphantsi) kunokuba lwalungaphambi kwayo, kwaye ngoko ke umlawuli womgca kwi-RP2040 uphuculwe ngesilawuli sokutshintsha. Oku kusivumela ukuba sisebenze ngamandla ngamandla kwimisinga ephezulu (ukuya kuthi ga kwi-200mA xa kuthelekiswa ne-100mA ngaphambili).

Umqulu omtsha we-chiptagUmlawuli

Umzobo 3. Icandelo lesikimu elibonisa isekethe yomlawuli wangaphakathi

Umlawuli womgca we-RP2040 wayenezikhonkwane ezimbini, igalelo le-3.3V, kunye nemveliso ye-1.1V yokubonelela nge-DVDD kwi-chip. Ngeli xesha, umlawuli we-RP235x uchungechunge unezikhonkwane ezintlanu, kwaye ufuna inxalenye yangaphandle ukuze isebenze. Nangona oku kubonakala ngathi kuyinyathelo elingasemva malunga nokusebenziseka, umlawuli wokutshintsha une-advantage yokusebenza kakuhle kwamandla kumthwalo ophezulu imisinga.

Njengoko igama libonisa, umlawuli uvula ngokukhawuleza kwaye acime i-transistor yangaphakathi edibanisa i-voltage ye-3.3V.tage (VREG_VIN) ukuya VREG_LX pin, kwaye ngoncedo i inductor (L1) kunye capacitor output (C7), inokuvelisa DC output voltage eye yahla-phantsi ukusuka kwigalelo. I-VREG_FB iphini ibeka iliso kwivolthi yemvelisotage, kwaye ulungelelanisa umlinganiselo wokuvula/ucima womjikelo wokutshintsha, ukuqinisekisa ukuba umthamo ofunekayotage igcinwa. Njengoko imisinga emikhulu iguqulwa ukusuka kwi-VREG_VIN ukuya kwi-VREG_LX, i-capacitor enkulu (i-C6) esondeleyo kwigalelo iyafuneka, ngoko asiyikuphazamisa unikezelo lwe-3.3V kakhulu. Ukuthetha ngale misinga mikhulu yokutshintsha, umlawuli naye uza kunye noqhagamshelo lwalo lokubuyisela umhlaba, i-VREG_PGND. Ngokufanayo ne-VREG_VIN kunye ne-VREG_LX, ukucwangciswa kolu xhulumaniso kubaluleke kakhulu, kwaye ngelixa i-VREG_PGND kufuneka idibanise kwi-GND engundoqo, kufuneka yenziwe ngendlela yokuba yonke imisinga enkulu yokutshintsha ibuyele ngqo kwi-PGND pin, ngaphandle kokuphazamisa abanye iGND kakhulu.

Iphini lokugqibela yi-VREG_AVDD, ebonelela ngokujikeleza kwe-analogue ngaphakathi komlawuli, kwaye oku kuvakalelwa kakhulu kwingxolo.

Umzobo 4. Icandelo leskim elibonisa i-PCB layout yomlawuli

Uyilo lomlawuli kwiibhodi ezincinci lubonisa ngokusondeleyo i-Raspberry Pi Pico 2. Umsebenzi omkhulu uye waya kuyilo lwale sekethi, kunye nokuphindaphinda okuninzi kwePCB efunekayo ukuze siyenze ibe ntle njengoko sinako. unako. Ngelixa ungabeka la macandelo ngeendlela ezahlukeneyo kwaye usenokufumana umlawuli ukuba 'asebenze' (okt, ukuvelisa umthamo wemveliso.tagKwinqanaba elichanekileyo, elilungile ngokwaneleyo ukuyifumana ikhowudi esebenzayo), sifumanise ukuba umlawuli wethu kufuneka aphathwe ngendlela eyiyo ukuyigcina yonwabile, kwaye ngokonwaba, ndithetha ukuvelisa umthamo ochanekileyo.tage phantsi koluhlu lweemeko zangoku zomthwalo.
Ngelixa sisenza iimvavanyo zethu koku, siye saphoxeka ngandlel’ ithile ukukhunjuzwa ukuba umhlaba ongathandekiyo wefiziksi awunakuhlala ungahoywa. Thina, njengeenjineli, ubukhulu becala siyazama ukwenza kanye oku; ukwenza lula amalungu, ukungahoyi (kaninzi) izinto eziphathekayo ezingabalulekanga, kwaye endaweni yoko sigxile kwipropati esinomdla kuyo.ample, i-resistor elula ayinayo nje ukuchasana, kodwa kunye ne-inductance, njl. Kwimeko yethu, thina (re) safumanisa ukuba i-inductors inommandla wemagnethi ehambelana nawo, kwaye okubalulekileyo, ikhanya kwisalathiso ngokuxhomekeke kwiyiphi indlela ikhoyili. inxeba, kunye necala lokuhamba komsinga. Siye sakhunjuzwa kwakhona ukuba i-inductor ekhuselweyo 'ngokupheleleyo' ayithethi into ocinga ukuba inokuyenza. Umhlaba wemagnethi uthotywe kakhulu, kodwa abanye basabaleka. Sifumanise ukuba ukusebenza komlawuli kungaphuculwa kakhulu ukuba i-inductor 'iyindlela elungileyo'.
Kuvela ukuba i-magnetic field ephumayo 'indlela engalunganga' i-inductor iphazamisa i-regulator output capacitor (C7), ethi yona iphazamise i-circuitry control ngaphakathi kwe-RP2350. Nge-inductor kwi-orientation efanelekileyo, kunye noyilo oluchanekileyo kunye nokukhethwa kwecandelo elisetyenziswe apha, ke le ngxaki iyahamba. Ngokungathandabuzekiyo kuyakubakho ezinye izibeko, amacandelo, njalo njalo, anokusebenza ne-inductor kulo naluphi na uqhelaniso, kodwa banokusebenzisa indawo eninzi yePCB ukwenza njalo. Sinike olu yilo lucetyiswayo ukuze sisindise abantu iiyure ezininzi zobunjineli esizichithe siphuhlisa kwaye sicokisa esi sisombululo sihlangeneyo nesiziphethe kakuhle.
Ngakumbi ukuya kwinqanaba, siya kude kangangokuba ukuba ukhetha ukungasebenzisi ex yethuample, ke ukwenze oko ngomngcipheko wakho. Kuninzi njengoko sele sisenza nge-RP2040 kunye nesekethe yekristale, apho sinyanzelisa (kakuhle, sicebisa ngamandla) ukuba usebenzise inxalenye ethile (siya kuyenza kwakhona kwicandelo lekristale lolu xwebhu).
Umkhombandlela wezi inductors zincinci zintle kakhulu zingahoywa jikelele, kunye nokuqhelaniswa kwekhoyili ejikelezayo akunakwenzeka ukuba ifumaneke, kwaye isasazwe ngokungenamkhethe ecaleni kwereli yamacandelo. Iisayizi ezinkulu ze-inductor case zisoloko zifunyaniswa zinempawu ze-polarity kuzo, nangona kunjalo asifumananga zifanelekileyo kwi-0806 (2016 metric) ubukhulu becala esilikhethileyo. Kule njongo, siye sasebenza kunye no-Abracon ukuvelisa inxalenye ye-3.3μH kunye nechaphaza ukubonisa i-polarity, kwaye okubalulekileyo, yiza kwi-reel kunye nazo zonke zihambelana ngendlela efanayo. I-TBD (okanye iza kuthi kungekudala) ifumaneke kuluntu ngokubanzi kubasasazi. Njengoko bekutshiwo ngaphambili, unikezelo lweVREG_AVDD lunovakalelo kakhulu kwingxolo, kwaye ke kufuneka luhluzwe. Sifumene ukuba njengoko i-VREG_AVDD izoba malunga ne-200μA kuphela, isihluzo se-RC ye-33Ω kunye ne-4.7μF yanele.
Ke, ukuhlaziya, izinto ezisetyenzisiweyo ziya kuba…
- C6, C7 & C9 – 4.7μF (0402, 1005 metric)
- L1 – Abracon TBD (0806, 2016 metric)
- I-R3 – 33Ω (0402, 1005 metric)
Idata yedatha ye-RP2350 inengxoxo ethe kratya malunga nezindululo zobeko lomlawuli, nceda ujonge iiMihlo zaNgaphandle kunye neemfuno zobeko lwePCB.

Ungeniso lokufaka

Uqhagamshelwano lwamandla okufakwayo kolu yilo luhamba nge-5V VBUS pin ye-Micro-USB connector (ebhalwe ngu-J1 kwi-Figure 5). Le yindlela eqhelekileyo yokunika amandla izixhobo ze-elektroniki, kwaye iyavakala apha, njengoko i-RP2350 inokusebenza kwe-USB, esiya kuba sifaka iintambo kwiiphini zedatha yesi sidibanisi. Njengoko sifuna kuphela i-3.3V yolu yilo (ubonelelo lwe-1.1V luvela ngaphakathi), kufuneka sithobe unikezelo lwe-USB olungenayo lwe-5V, kulo mzekelo, usebenzisa enye, ivolthi yangaphandle.tage-regulator, kulo mzekelo umlawuli we-linear (i-Low Drop Out regulator, okanye i-LDO). Ndikhe ndancoma ubuhle bokusebenzisa isilawuli esisebenzayo sokutshintsha, inokuba lukhetho lobulumko ukusebenzisa enye apha, kodwa ndikhethe ukwenza lula. Okokuqala, ukusebenzisa i-LDO kusoloko kulula. Akukho zibalo zifunekayo ukufumanisa ukuba yeyiphi i-inductor yobungakanani ekufuneka uyisebenzise, okanye ukuba zinkulu kangakanani ii-capacitors zemveliso, kwaye uyilo luhlala luthe ngqo ngakumbi. Okwesibini, ukugcina yonke ithontsi lamandla ayisiyiyo injongo apha; ukuba bekunjalo, ndingathanda ngokunzulu ukusebenzisa isilawuli sokutshintsha, kwaye ungafumana i example yokwenza njalo kwiRaspberry Pi Pico 2. Kwaye okwesithathu, ndiyakwazi ngokulula 'ukuboleka' isekethe ebendiyisebenzisa ngaphambili kuguqulelo lweRP2040 lwebhodi encinci. I-NCP1117 (U2) ekhethiweyo apha inesiphumo esisisigxina se-3.3V, ifumaneka ngokubanzi, kwaye inokubonelela ukuya kwi-1A yangoku, eya kuba yinto eninzi yoyilo oluninzi. Ujongo lwedatha yedatha ye-NCP1117 isixelela ukuba esi sixhobo sifuna i-capacitor ye-10μF kwigalelo, kunye nenye kwimveliso (C1 kunye neC5).

Ukudibanisa i-capacitors

Umzobo 6. Icandelo leSchematic elibonisa i-RP2350 igalelo lonikezelo lwamandla, voltagumlawuli kunye ne-decoupling capacitors

Enye inkalo yoyilo lonikezelo lwamandla zii-decoupling capacitors ezifunekayo kwi-RP2350. Ezi zibonelela ngemisebenzi emibini esisiseko. Okokuqala, bahluza ingxolo yonikezelo lwamandla, kwaye okwesibini, babonelele ngentlawulo yendawo apho iisekethe ezingaphakathi kwe-RP2350 zinokuzisebenzisa ngesaziso esifutshane. Oku kuthintela umthamotaginqanaba kwindawo ekufutshane ukusuka ekuweni kakhulu xa imfuno yangoku isanda ngokukhawuleza. Ngenxa yokuba, oku, kubalulekile ukubeka i-decoupling kufuphi nezikhonkwane zamandla. Ngokuqhelekileyo, sincoma ukusetyenziswa kwe-100nF capacitor nge-pin yamandla nganye, nangona kunjalo, siyatenxa kulo mgaqo kwiimeko ezimbalwa.

Umzobo 7. Icandelo loyilo olubonisa i-RP2350 indlela kunye nokudibanisa

Okokuqala, ukuze sikwazi ukufumana indawo eyaneleyo yokuba zonke izikhonkwane ze-chip zikwazi ukukhutshelwa ngaphandle, kude nesixhobo, kufuneka sidibanise nenani le-decoupling capacitors esinokuyisebenzisa. Kulo qulunqo, izikhonkwane ze-53 kunye ne-54 ye-RP2350A (izikhonkwane ze-68 kunye ne-69 ze-RP2350B) zabelana nge-capacitor enye (i-C12 kwi-Figure 7 kunye ne-Figure 6), njengoko kungekho ndawo eninzi kweli cala lesixhobo, kunye namacandelo. kwaye uyilo lomlawuli luthatha indawo yokuqala.
Oku kunqongophala kwendawo kunokoyiswa ngandlel’ ithile ukuba sisebenzise itekhnoloji entsonkothileyo/ebiza imali eninzi, njengezinto ezincinci, okanye umaleko we-PCB eneenxalenye kumacala aphezulu nasezantsi. Olu lurhwebo loyilo; siye sanciphisa ubunzima kunye neendleko, ngeendleko zokuba ne-capacitance encinci yokuqhawula, kunye ne-capacitors ekude kancinane kwi-chip kunokuba ilungile (oku kwandisa i-inductance). Oku kunokuba nesiphumo sokunciphisa isantya esiphezulu soyilo esinokusebenza kuso, njengoko umthamotagUnikezelo lwe-e lunokuba nomsindo kakhulu kwaye lwehle ngaphantsi komthamo ophantsi ovunyelweyotage; kodwa kwizicelo ezininzi, olu rhwebelwano lufanele ukwamkeleka.

Okunye ukutenxa kumgaqo we-100nF kukuba siphucule ngakumbi umthamotagukusebenza komlawuli; sincoma ukusebenzisa i-4.7μF yeC10, ebekwe kwelinye icala le-chip ukusuka kumlawuli.

Isahluko 3. Inkumbulo edanyazayo

Isibane sokuqala

Umzobo 8. Icandelo leSchematic elibonisa imemori ye-flash ephambili kunye ne-USB_BOOT yokujikeleza

Ukuze ukwazi ukugcina ikhowudi yeprogram apho i-RP2350 inokuqalisa kwaye iqhutywe kuyo, kufuneka sisebenzise imemori ye-flash, ngokukodwa, imemori ye-quad SPI flash. Isixhobo esikhethiweyo apha sisixhobo se-W25Q128JVS (U3 kuMfanekiso 8), eyi-chip ye-128Mbit (16MB). Le yeyona sayizi inkulu yenkumbulo enokuxhaswa yiRP2350. Ukuba usetyenziso lwakho aludingi kugcinwa lungako, inkumbulo encinci enexabiso eliphantsi ingasetyenziswa endaweni yoko.
Njengoko le databus inokuba yi-frequency ephezulu kwaye isetyenziswa rhoqo, izikhonkwane ze-QSPI ze-RP2350 kufuneka zifakwe iingcingo ngokuthe ngqo kwi-flash, zisebenzisa uqhagamshelo olufutshane ukugcina imfezeko yomqondiso, kunye nokunciphisa i-crosstalk kwiisekethe ezingqongileyo. I-Crosstalk kulapho imiqondiso kumnatha wesekethe enye inokubangela ivolthi engafunwayotages kwisekethe engummelwane, enokubangela iimpazamo ukuba zenzeke.

Umqondiso we-QSPI_SS yimeko ekhethekileyo. Idityaniswe kwi-flash ngqo, kodwa ikwanezinto ezimbini ezixhathisayo (kakuhle, ezine, kodwa ndiza kuza kuloo nto kamva) ziqhagamshelwe kuyo. Eyokuqala (i-R1) kukutsala ukuya kubonelelo lwe-3.3V. Imemori edanyazayo ifuna igalelo lokukhethwa kwetshiphu libe kwivolthi enyetage njenge-pin yayo yokubonelela nge-3.3V njengoko isixhobo sinikwe amandla, ngaphandle koko, ayisebenzi ngokuchanekileyo. Xa i-RP2350 inikwe amandla, i-pin yayo ye-QSPI_SS iya ngokuzenzekelayo ukutsalwa, kodwa kukho ixesha elifutshane ngexesha lokutshintsha apho imeko ye-QSPI_SS ingenakuqinisekiswa. Ukongezwa kwe-resistor yokutsalwa kuqinisekisa ukuba le mfuneko iya kuhlala inelisekile. I-R1 iphawulwe njenge-DNF (Musa Ukufaneleka) kwi-schematic, njengoko sifumene ukuba ngesi sixhobo sikhanyisayo, ukutsalwa kwangaphandle akuyomfuneko. Nangona kunjalo, ukuba isibane esahlukileyo sisetyenzisiwe, kunokubaluleka ukwazi ukufaka i-10kΩ isixhasi apha, ngoko sibandakanyiwe nje ukuba kunokwenzeka.
Isichasi sesibini (R6) yi-1kΩ isixhasi, esiqhagamshelwe kwiqhosha lokutyhala (SW1) elibhalwe 'USB_BOOT'. Oku kungenxa yokuba iqhosha le-QSPI_SS lisetyenziswa 'njengomtya wesiqalo'; I-RP2350 ijonga ixabiso lale I/O ngexesha lolandelelwano lwesiqalo, kwaye ukuba ifunyenwe iyingqiqo 0, emva koko i-RP2350 ibuyela kwimo ye-BOOTSEL, apho i-RP2350 iziveza njengesixhobo sogcino oluninzi lwe-USB, kwaye ikhowudi inokukhutshelwa ngokuthe ngqo. kuyo. Ukuba sicinezela iqhosha ngokulula, sitsalela i-QSPI_SS isikhonkwane emhlabeni, kwaye ukuba isixhobo siphinda sisetyenziselwe emva koko (umzekelo ngokucofa i-RUN pin), i-RP2350 iyakuqala kwakhona kwimo ye-BOOTSEL endaweni yokuzama ukuqhuba imixholo yesibane. Ezi resistors, i-R2 kunye ne-R6 (i-R9 kunye ne-R10 nayo), kufuneka ibekwe kufuphi ne-flash chip, ngoko siphephe ubude obongezelelweyo beengoma zobhedu ezinokuchaphazela umqondiso.
Konke oku ngasentla kusebenza ngokukodwa kwi-RP2350, engenalo ukukhanya kwangaphakathi. Ewe kunjalo, izixhobo ze-RP2354 zineenkumbulo ze-2MB zangaphakathi, ngoko ke imemori ye-U3 yangaphandle ayifuni, ngoko ke i-U3 inokususwa ngokukhuselekileyo kwi-schematic, okanye ishiywe ingenamntu. Nakweyiphi na kwezi meko, sisenokufuna ukugcina iswitshi ye-USB_BOOT iqhagamshelwe kwi-QSPI_SS, ukuze sibe nokungena kwimowudi yokuqalisa i-USB.

Isibane sesibini okanye iPSRAM

Uluhlu lwe-RP235x ngoku luxhasa isixhobo sememori yesibini sisebenzisa izikhonkwane ze-QSPI ezifanayo, kunye ne-GPIO enikezela nge-chip eyongezelelweyo ekhethiweyo. Ke, ukuba sisebenzisa i-RP2354 (ene-flash yangaphakathi), ngoko sinokusebenzisa i-U3 njengesibane sesibini, okanye siyibuyisele ngesixhobo se-PSRAM. Ukuze senze oku, kufuneka sikhuphe iQSPI_SS kwi-U3, kwaye endaweni yoko siyidibanise neGPIO efanelekileyo endaweni yoko. I-GPIO ekufutshane ekwaziyo ukuba yi-chip ekhethiweyo (XIP_CS1n) yi-GPIO0, ngoko ngokususa i-0Ω ukusuka kwi-R10, kwaye uyifake kwi-R9, sinokufikelela ku-U3 ngoku ukongeza kwisibane se-chip. Ukuze uthathe i-advan ngokupheleleyotage yale nkalo, apho sinezixhobo ezimbini zememori yangaphandle ukwenzela ukuba i-flash-less RP2350 iinxalenye zinokuzuza, ezinkulu kwiibhodi ezimbini ezincinci, ze-RP2350B, zibandakanya i-footprint yokuzikhethela (U4) ye-chip yememori eyongezelelweyo.

Umzobo 9. Icandelo leskimu elibonisa isixhobo sememori esesibini esikhethiweyo

Ukuze ukwazi ukusebenzisa esi sixhobo, kuya kufuneka ngokucacileyo ukuba sibe nabantu , kunye ne-R11 (0Ω), kunye ne-R13 (10KΩ). Ukongezwa kwe-R11 kudibanisa i-GPIO0 (umqondiso we-XIP_CS1n) kwi-chip ekhethiweyo yememori yesibini. Ukutsalwa-phezulu kwiphini yokukhetha iphini ngokuqinisekileyo kuyafuneka ngeli xesha, njengoko imeko engagqibekanga ye-GPIO0 iza kutsalwa phantsi kumandla-phezulu, okuya kubangela ukuba isixhobo sethu sombane singaphumeleli. I-C22 iya kufuneka kwakhona ukubonelela ngokuqhawulwa kobonelelo lwamandla kwi-U4.

Iitshiphusi zeflash ezixhaswayo
Ulandelelwano lokuqala lwe-flash probe, olusetyenziswa ngasezantsi ukukhupha okwesibinitage ukusuka kwi-flash, isebenzisa umyalelo wokufunda we-serial we-03h, kunye ne-24-bit idilesi, kunye newotshi yesiriyali emalunga ne-1MHz. Ijikeleza ngokuphindaphindiweyo kwindibaniso ezine zewotshi kunye nesigaba sewotshi, ikhangela imizuzwana esebenzayo.tage CRC32 itshekhisum.
Njengoko uk wesibinitage ke ukhululekile ukuqwalasela ukuphumeza-kwindawo usebenzisa umyalelo ofanayo 03h serial funda, RP2350 ungenza flash cached execute-in-indawo nayo nayiphi chip exhasa 03h uthotho funda nge 24-bit idilesi, equka uninzi 25-series flash izixhobo. . I-SDK ibonelela nge example yesibini stage ye CPOL=0 CPHA=0, e https://github.com/raspberrypi/pico-sdk/blob/master/src/rp2350/boot_stage2/boot2_generic_03h.S. Ukuxhasa udweliso lwenkqubo usebenzisa iinkqubo ezisezantsi , isixhobo kufuneka siphendule le miyalelo ilandelayo:

02h 256-byte inkqubo yephepha
Irejista yobume be-05h ifundwe
06h seta bhala vula i-latch

20h 4kB icandelo lokucima

I-RP2350 ikwaxhasa iindidi ngeendidi ezininzi ze-SPI kunye ne-QSPI yokufikelela iindlela. Umzekeloample, https://github.com/raspberrypi/pico-sdk/blob/master/src/rp2350/boot_stage2/boot2_w25q080.S iqwalasela isixhobo seWinbond W25Q-series ye-quad-IO yemowudi yokufunda eqhubekayo, apho i-RP2350 ithumela iidilesi ze-quad-IO (ngaphandle kwesimaphambili somyalelo) kunye ne-flash iphendula ngedatha ye-quad-IO.

Esinye isilumkiso siyafuneka ngeendlela ezidanyazayo ze-XIP apho isixhobo esidanyazayo siyeka ukuphendula kwimiyalelo yesiriyali eqhelekileyo, njenge Winbond eqhubekayo yokufunda imo ekhankanywe ngasentla. Oku kunokubangela imiba xa i-RP2350 iphinda icwangciswa, kodwa isixhobo sombane asiqhutywa ngamandla, kuba isibane asisayi kuphendula kulandelelwano lwe-flash probe ye-bootrom. Phambi kokuba ikhuphe uthotho lwe-03h lufundwe, i-bootrom ihlala ikhupha olu landelelwano lulandelayo olusisigxina, olulolona lulandelelwano lungcono lokuyeka i-XIP kuluhlu lwezixhobo zombane:

CSn=1, IO[3:0]=4'b0000 (ngokutsalela ezantsi ukunqanda ingxabano), khupha ×32 iwotshi
CSn=0, IO[3:0]=4'b1111 (ngokutsalwa unqande ingxabano), khupha ×32 iwotshi
CSn=1

CSn=0, MOSI=1'b1 (eqhutywa ezantsi-Z, zonke ezinye ii-I/Os Hi-Z), khupha iiwotshi ×16

Ukuba isixhobo osikhethileyo asiphenduli kolu landelelwano xa sikwimo eqhubekayo yokufunda, ngoko ke kufuneka sigcinwe kwindawo apho utshintshiselwano ngalunye lubekwe phambi komyalelo wothotho, kungenjalo i-RP2350 ayizukwazi ukuphinda iphinde ilandele ukusetha kwakhona kwangaphakathi.
Ngolwazi oluthe vetshe nge-QSPI, nceda ujonge i-QSPI Memory Interface (QMI) kwiphepha ledatha le-RP2350.

Isahluko 4. I-Crystal Oscillator

Umzobo 10. Icandelo lesikimu esibonisa i-crystal oscillator kunye ne-capacitors yomthwalo

Ukuthetha ngokuthe ngqo, i-RP2350 ayifuni mthombo wewotshi yangaphandle, njengoko ine-oscillator yayo yangaphakathi. Nangona kunjalo, njengoko amaxesha amaninzi ale oscillator yangaphakathi ayichazwanga kakuhle okanye ilawulwe, ihluka ukusuka kwi-chip ukuya kwi-chip, kunye nokubonelela ngevolthi eyahlukileyo.tages kunye namaqondo obushushu, kuyacetyiswa ukuba usebenzise umthombo ozinzileyo wangaphandle. Ii-aplikeshini ezixhomekeke kwiifrikhwensi ezichanekileyo azinakwenzeka ngaphandle komthombo wangaphandle wangaphandle, i-USB yi-ex prime example.
Ukubonelela ngomthombo wangaphandle wefrikhwensi unokwenziwa ngenye yeendlela ezimbini: nokuba ngokubonelela ngomthombo wewotshi kunye nemveliso yeCMOS (isikwere wave se-IOVDD vol.tage) kwi-XIN pin, okanye ngokusebenzisa icrystal 12MHz eqhagamshelwe phakathi
XIN kunye XOUT. Ukusebenzisa ikristale lolona khetho lukhethwayo apha, njengoko zombini zinexabiso eliphantsi kwaye zichanekile kakhulu.

Ikristale ekhethiweyo yolu yilo yi-ABM8-272-T3 (Y1 kuMfanekiso 10). Le yikristale ye-12MHz efanayo esetyenziswe kwi-Raspberry Pi Pico kunye ne-Raspberry Pi Pico 2. Sincoma kakhulu ukusebenzisa le crystal kunye neesekethe ezihamba kunye nokuqinisekisa ukuba iwotshi iqala ngokukhawuleza phantsi kwazo zonke iimeko ngaphandle kokonakalisa ikristale ngokwayo. I-crystal ine-30ppm yokunyamezela rhoqo, ekufuneka ilungile ngokwaneleyo kwizicelo ezininzi. Kanye kunye nokunyamezela rhoqo kwe-+/-30ppm, ine-ESR ephezulu ye-50Ω, kunye ne-capacitance yomthwalo we-10pF, zombini ezo zinefuthe ekukhethweni kwamacandelo ahambayo.
Ukuze i-crystal ijikeleze kwi-frequency efunwayo, umenzi uchaza umthamo womthwalo ofunekayo ukuba enze njalo, kwaye kule meko, yi-10pF. Le capacitance yomthwalo ifezekiswa ngokubeka i-capacitors ezimbini zexabiso elilinganayo, enye kwicala ngalinye le-crystal ukuya kumhlaba (C3 kunye neC4). Ukusuka kwindawo yekristale view, ezi capacitors zidityanisiwe kuthotho phakathi kwee-terminals zayo ezimbini. Ithiyori yesekethe esisiseko isixelela ukuba idibanisa ukunika amandla (C3 * C4) / (C3 + C4), kwaye njengeC3 = C4, ke iC3/2 ngokulula. Kule example, siye sasebenzisa i-15pF capacitors, ngoko ke indibaniselwano yochungechunge yi-7.5pF. Ukongeza kule capacitance yomthwalo ngabom, kufuneka kwakhona songeze ixabiso le-capacitance eyongezelelweyo engenziwanga ngabom, okanye i-parasitic capacitance, esiyifumana kwiingoma ze-PCB kunye ne-XIN kunye ne-XOUT pins ye-RP2350. Sizakuthatha ixabiso le-3pF kule nto, kwaye njengoko obu buchule buhambelana ne-C3 kunye ne-C4, songeza nje oku ukusinika umthamo opheleleyo we-10.5pF, ekufutshane ngokwaneleyo ekujoliswe kuyo kwe-10pF. Njengoko ubona, i-parasitic capacitance ye-PCB traces yinto, kwaye ke kufuneka sizigcine zincinci ukuze singayicaphukisi ikristale kwaye siyiyeke i-oscillating njengoko bekucwangcisiwe. Zama kwaye ugcine uyilo lufutshane kangangoko.
Ingqwalasela yesibini yi-ESR ephezulu (i-requivalent series resistance) ye-crystal. Siye sakhetha isixhobo esinobuninzi be-50Ω, njengoko sifumene ukuba oku, kunye ne-1kΩ series resistor (R2), lixabiso elihle lokuthintela ukuba ikristale iqhutywe kakhulu kwaye yonakaliswe xa usebenzisa i-IOVDD. umgangatho we-3.3V. Nangona kunjalo, ukuba i-IOVDD ingaphantsi kwe-3.3V, ngoko i-drive yangoku ye-XIN/XOUT izikhonkwane iyancipha, kwaye uya kufumanisa ukuba ampI-litude ye-crystal iphantsi, okanye inokuthi ingabikho kwaphela. Kule meko, ixabiso elincinci le-resistor yochungechunge liya kufuneka lisetyenziswe. Nakuphi na ukuphambuka kwi-crystal circuit eboniswe apha, okanye kunye nenqanaba le-IOVDD ngaphandle kwe-3.3V, kuya kufuna uvavanyo olubanzi ukuze kuqinisekiswe ukuba i-crystal oscillates phantsi kwazo zonke iimeko, kwaye iqalise ngokukhawuleza ngokukhawuleza ukuba ingabangeli iingxaki ngesicelo sakho.

Ikristale ecetyiswayo

Uyilo lwangaphambili usebenzisa i-RP2350 sincoma ukusebenzisa i-Abracon ABM8-272-T3. Umzekeloample, ukongeza kuyilo oluncinci example, bona Pico 2 ibhodi schematic kwiSihlomelo B ye Raspberry Pi Pico 2 Datasheet kunye Pico 2 uyilo files.
Ukwenza ngcono kunye nozinzo kuwo wonke amaqondo obushushu obusebenzayo, sebenzisa i-Abracon ABM8-272-T3. Unomthombo we-ABM8-272-T3 ngqo kwi-Abracon okanye kumthengisi ogunyazisiweyo. I-Pico 2 ilungiselelwe ngokukodwa i-ABM8-272-T3, enezi nkcukacha zilandelayo:

Nangona usebenzisa i-crystal eneenkcukacha ezifanayo, kuya kufuneka uvavanye isiphaluka kuluhlu lwamaqondo okushisa ukuqinisekisa ukuzinza.
I-crystal oscillator inikwe amandla kwi-IOVDD voltage. Ngenxa yoko, ikristale Abracon kunye nokuba damping resistor zilungiselelwe ukusebenza 3.3V. Ukuba usebenzisa i-IO eyahlukileyo voltage, kuya kufuneka uphinde udibanise.
Naluphi na utshintsho kwi-crystal parameters umngcipheko wokungazinzi kuwo onke amacandelo axhunyiwe kwi-crystal circuit.

Ukuba awukwazi ukufumana i-crystal ecetyiswayo ngokuthe ngqo kwi-Abracon okanye umthengisi, qhagamshelana izicelo@raspberrypi.com.

Isahluko 5. Ii-IOs

i-USB
Umzobo 11. Icandelo elicwangcisiweyo elibonisa izikhonkwane ze-USB ze-RP2350 kunye nokupheliswa kothotho.

I-RP2350 ibonelela ngezikhonkwane ezibini eziza kusetyenziselwa isantya esipheleleyo (FS) okanye isantya esisezantsi (LS) USB, nokuba ngumamkeli okanye isixhobo, kuxhomekeke kwisoftware esetyenziswayo. Njengoko sele sixoxile, i-RP2350 inokuphinda iqale njengesixhobo sokugcina ubuninzi be-USB, ngoko ke ukudibanisa ezi zikhonkwane kwisidibanisi se-USB (J1 kuMfanekiso 5) kuyavakala. I-USB_DP kunye ne-USB_DM izikhonkwane kwi-RP2350 ayifuni naluphi na utsalo olongezelelweyo okanye ukutsalwa (okufunekayo ukubonisa isantya, i-FS okanye i-LS, okanye ingaba inginginya okanye isixhobo), njengoko ezi zakhiwe kwi-I / Os. Nangona kunjalo, ezi I/Os zifuna i-27Ω izichasi zokuphelisa uthotho (i-R7 kunye ne-R8 kuMfanekiso we-11), zibekwe kufutshane netshiphu, ukuze kuhlangatyezwane nenkcazo yokuphazamiseka kwe-USB.
Nangona i-RP2350 inqunyelwe kwisantya esipheleleyo sedatha yesantya (12Mbps), kufuneka sizame kwaye siqinisekise ukuba iimpawu zokuthintela iintambo zothumelo (iingoma zobhedu ezidibanisa itshiphu kwisidibanisi) zikufuphi
Inkcazo ye-USB ye-90Ω (ilinganiswe ngokwahlukileyo). Kwibhodi eshinyeneyo eyi-1mm efana nale, ukuba sisebenzisa i-0.8mm yeengoma ezibanzi kwi-USB_DP kunye ne-USB_DM, kunye nomsantsa we-0.15mm phakathi kwabo, kufuneka sifumane i-impedance yeempawu ezijikelezayo malunga ne-90Ω. Oku kukuqinisekisa ukuba iimpawu zinokuhamba kwezi ngcingo zothumelo ngokucocekileyo kangangoko, kucuthwe umthamotage reflections enokunciphisa imfezeko yomqondiso. Ukuze ezi ntambo zothumelo zisebenze ngokufanelekileyo, kufuneka siqinisekise ukuba ngaphantsi kwezi ngcingo kukho umhlaba. Indawo eqinileyo, engaphazamisekiyo yobhedu lomhlaba, yolula yonke ubude bomzila. Kolu yilo, phantse yonke imigangatho yobhedu esezantsi inikezelwe emhlabeni, kwaye inkathalo ethile yathathwa ukuqinisekisa ukuba iingoma ze-USB azidluli nto ngaphandle komhlaba. Ukuba i-PCB etyebileyo kune-1mm ikhethelwe ukwakha kwakho, ke sinokukhetha ezimbini. Sinokuphinda senze iintambo zothumelo lwe-USB ukuhlawulela umgama omkhulu phakathi kwendlela kunye nomhlaba ongaphantsi (onokuthi ube yinto engenakwenzeka ngokwasemzimbeni), okanye sinokuyihoya, kwaye sinethemba lokuhle. I-USB FS inokuxolela kakhulu, kodwa iimayile zakho zinokwahluka. Kungenzeka ukuba isebenze kwizicelo ezininzi, kodwa ayizukuthobela umgangatho we-USB.

I/O imibhalo engasentla kwekhasi

Umzobo 12. Icandelo leSchematic elibonisa i-2.54mm I / O iintloko ze-QFN60 version

Ukongeza kwikhonkco le-USB esele likhankanyiwe, kukho iperi yemigca emibini ye-2.54mm headers (J2 kunye ne-J3 kwi-Figure 12), enye kwicala ngalinye lebhodi, apho i-I / O idibene nayo. Kukho i-30 GPIO kwi-RP2350A, kanti kukho i-48 GPIO kwi-RP2350B, ngoko ke iiheader kule nguqulo ye-Minimal board zikhulu ukuvumela izikhonkwane ezongezelelweyo (jonga uMfanekiso 13).
Njengoko oku kuyilo lwenjongo ngokubanzi, kungekho sicelo sithile engqondweni, i-I/O yenziwe yafumaneka ukuze idityaniswe njengoko umsebenzisi efuna. Uluhlu lwangaphakathi lwezikhonkwane kwi-header nganye yi-I / Os, kwaye umgca wangaphandle udibene nomhlaba. Kukuziqhelisa okulungileyo ukubandakanya izizathu ezininzi kwizihlanganisi ze-I/O. Oku kunceda ukugcina umhlaba ophantsi we-impedance, kunye nokubonelela ngeendlela ezininzi zokubuya ezinokuthi zibe khona kwimisinga ehamba ukuya nokubuya
I/O imidibaniso. Oku kubalulekile ukunciphisa uphazamiseko lwe-electro-magnetic olunokuthi lubangelwe kukubuya kwemisinga yokutshintsha ngokukhawuleza kweempawu ezithatha ixesha elide, iindlela ezijikelezayo ukugqiba isekethe.

Zombini iiheader zikwigridi enye ye-2.54mm, eyenza ukudibanisa le bhodi kwezinye izinto, ezifana neebhodi zesonka, kube lula. Ungafuna ukuqwalasela ukudibanisa kuphela iheader yomqolo omnye endaweni yeheader yomqolo emibini, unikeze ngomqolo ongaphandle wodibaniso lomhlaba, ukuyenza ilungele ngakumbi ukungena kwibhodi yesonka.

Umzobo 13. Icandelo leSchematic elibonisa i-2.54mm I / O iintloko ze-QFN80 version

NONE

Umzobo 14. Icandelo loyilo elibonisa i-JST ekhethiweyo yokudibanisa i-SWD debug

Ukulungisa iimpazamo kwi-chip, unganqwenela ukuqhagamshela kujongano lwe-SWD lweRP2350. Izikhonkwane ezimbini, i-SWD kunye ne-SWCLK, zifumaneka kwi-header ye-2.54mm, i-J3, ukuvumela i-debug probe oyikhethile ukuba idibaniswe lula. Ukongeza koku, ndifake i-header ye-JST ekhethiweyo, evumela uqhagamshelo olulula kwi-Raspberry Pi Debug Probe. Awudingi ukusebenzisa oku, iiheader ze-2.54mm ziyakwanela ukuba ujonge ukulungisa isoftware, kodwa ndikufumanisa kulula ngakumbi ukwenza njalo. Ndikhethe isinxibelelanisi esithe tye, ikakhulu kuba ndiyayithanda inkangeleko yaso, nokuba ayikho emphethweni webhodi, kodwa ezithe nkqo ziyafumaneka, nangona zinonyawo olwahluke kancinane.

Amaqhosha
Uyilo oluncinci ngoku aluqukethe enye, kodwa amaqhosha amabini, apho inguqulo ye-RP240 yayingenayo. Enye yeyokukhetha i-USB boot njengoko besesixoxile ngaphambili, kodwa eyesibini liqhosha 'lokusetha ngokutsha', elibotshelelwe kwi-RUN pin. Akukho nanye kwezi eyimfuneko ngokungqongqo (nangona iqhosha le-BOOTSEL kuya kufuneka litshintshwe ngeheader okanye okufanayo ukuba imowudi yokuqalisa i-USB ibifuneka), kwaye inokususwa ukuba indawo okanye ixabiso liyinkxalabo, kodwa ngokuqinisekileyo benza ukusebenzisa i-RP2350 kude. amava amnandi ngakumbi.

Isihlomelo A: Gqibezela iSchematic -RP2350A version

Umzobo 15. Isicwangciso esipheleleyo soYilo oluNcinane lwe-RP2350A

IsiHlomelo B: Gqibezela iSchematic -RP2350B version

Umzobo 16. Isicwangciso esipheleleyo soYilo oluNcinane lwe-RP2350B

ISihlomelo H: Imbali yokukhutshwa kwamaxwebhu

Nge-8 ka-Agasti 2024
Ukukhutshwa kokuqala.

kunye neRaspberry Pi
IRaspberry Pi luphawu lwentengiso lweRaspberry Pi Ltd
I-Raspberry Pi Ltd

Amaxwebhu / Izibonelelo

Raspberry Pi SC1631 Raspberry Microcontroller [pdf] Incwadi Yomyalelo
SC1631 Raspberry Microcontroller, SC1631, Raspberry Microcontroller, Microcontroller

Iimbekiselo

Incwadi yokusebenzisa

Raspberry Pi SC1631 Raspberry Microcontroller

Imiyalelo yokusetyenziswa kwemveliso