I-Raspberry Pi SC1631 Raspberry Microcontroller Instruction Manual

Isahluko 1: Isingeniso
Uchungechunge lwe-RP2350 lunikeza izinketho ezahlukene zephakheji uma kuqhathaniswa nochungechunge lwe-RP2040. I-RP2350A ne-RP2354A iza ngephakeji ye-QFN-60 ngaphandle kanye nesitoreji se-flash sangaphakathi ngokulandelana, kuyilapho i-RP2354B ne-RP2350B ziza ngephakheji le-QFN-80 elinokugcina noma ngaphandle kwe-flash.

Isahluko 2: Amandla
Uchungechunge lwe-RP2350 lufaka ivolumu entsha yokushintsha i-on-chiptagi-e regulator enezikhonkwane ezinhlanu. Lesi silawuli sidinga izingxenye zangaphandle ukuze zisebenze kodwa sinikeza ukusebenza kahle kwamandla aphezulu kumazansi okulayisha aphezulu uma kuqhathaniswa nesilawuli somugqa ochungechungeni lwe-RP2040. Naka ukuzwela komsindo kuphinikhodi ye-VREG_AVDD enikezela ngokujikeleza kwe-analogue.

Imibuzo Evame Ukubuzwa (FAQ)

Q: Uyini umehluko omkhulu phakathi kwe-RP2350A ne-RP2350B?
A: Umehluko omkhulu usebukhoneni besitoreji se-flash sangaphakathi. I-RP2350A ayinaso isitoreji se-flash sangaphakathi kuyilapho i-RP2350B inaso.
Q: Mangaki amaphini anevolumutagIsilawuli ochungechungeni lwe-RP2350 unayo?
A: UmqulutagI-e regulator ochungechungeni lwe-RP2350 inamaphini amahlanu.

Idizayini yezingxenyekazi zekhompuyutha nge-RP2350 Ukusebenzisa ama-microcontrollers angu-RP2350 ukwakha amabhodi nemikhiqizo

I-Colophon

Lo mbhalo unikezwe ilayisense ngaphansi kwe-Creative Commons Attribution-NoDerivatives 4.0 International (CC BY-ND). idethi yokwakha: 2024-08-08 inguqulo yokwakha: c0acc5b-clean
Isaziso esisemthethweni sokuzihlangula

IDATHA YOBUCHWEPHESHE NEYETHEMBEKA YEMIKHIQIZO YE-RASPBERRY PI (KUHLANGANISA IMINININGWANE) NJENGOBA ILUNGISWA NGESIKHATHI NGESIKHATHI (“IZINSIZA”) Ihlinzekwa YI-RASPBERRY PI LTD (“RPL”) “NJENGOBA IKHO” KANYE NOMA YILUPHI OKUSHIWO NOMA OKUSHIYELWE, AKUKHO IZIMALI EZIBALULEKILE, KUYA, IZIQINISEKISO EZISHIWO ZOKUTHENGISA NOKULUNGA KWENJONGO ETHILE ZIYEHLULEKA. NGESIKHATHI ESESIPHEZULU ESIGUNYAZWA UMTHETHO OSEBENZAYO AKUKHO MCIMBI ONGAWUKHONJWA I-RPL NGANOMA YILUPHI OKUQONDILE, OKUQONDILE, KWENZAKALO, OKUKHETHEKILE, OKUYISIBONELO, NOMA OKULANDELAYO (KUHLANGANISA, KODWA AKUNIKEZWE OKUNIKEZELWE, UKUNIKEZWA KOMTHETHO; , NOMA IZINZUZO NOMA UKUPHAMEZEKA KWEBHIZINISI) NOKHO KUBANGELWE KANYE NAKUNOMA YIMUPHI UMBONO WOKUBOPHEZELA, KUNGAKHATHALISEKILE, NGENKONDLELA, ISIBOPHO ESIQINILE, NOMA UKUHLUPHEKA (KUHLANGANISA NOBUDEBEPHO NOMA OKUNYE) KUVELA NGANOMA YIYIPHI INDLELA EKUSETSHENZISWA NGAYO, EKUSETSHENZISWA KOKUSETSHENZISWA KOKUNYE . LOMONAMANDLA ONJE.
I-RPL igodle ilungelo lokwenza noma yiziphi izithuthukisi, intuthuko, izilungiso nanoma yiziphi ezinye izinguquko ku-RESOURCES nanoma yimiphi imikhiqizo echazwe kuyo nganoma yisiphi isikhathi ngaphandle kwesaziso esengeziwe.
I-RESOURCES ihloselwe abasebenzisi abanamakhono abanamazinga afanelekile olwazi lokuklama. Abasebenzisi banomthwalo wemfanelo kuphela ekukhetheni kwabo nasekusebenziseni IZINTO EZINGAKUMBI kanye nanoma yikuphi ukusetshenziswa kwemikhiqizo echazwe kuyo. Umsebenzisi uyavuma ukunxephezela futhi abambe i-RPL ingenabungozi kuzo zonke izikweletu, izindleko, umonakalo noma okunye ukulahlekelwa okuvela ngenxa yokusebenzisa kwabo IZINSIZA.

I-RPL inikeza abasebenzisi imvume yokusebenzisa i-RESOURCES kuphela ngokuhlangana nemikhiqizo ye-Raspberry Pi. Konke okunye ukusetshenziswa kwe-RESOURCES akuvunyelwe. Ayikho ilayisensi enikezwa noma iyiphi enye i-RPL noma elinye ilungelo lempahla yengqondo lesithathu.
IMISEBENZI YENGOZI EPHEZULU. Imikhiqizo ye-raspberry Pi ayiklanyelwe, yenziwe noma ihloselwe ukusetshenziswa ezindaweni eziyingozi ezidinga ukusebenza okuphephile okuhlulekayo, njengalapho kusebenza khona izakhiwo zenuzi, ukuzulazula kwezindiza noma amasistimu okuxhumana, ukulawula ukuhamba emoyeni, izinhlelo zezikhali noma izinhlelo zokusebenza ezibalulekile zokuphepha (okuhlanganisa nokusekela impilo). amasistimu nezinye izisetshenziswa zezokwelapha), lapho ukwehluleka kwemikhiqizo kungaholela ngokuqondile ekufeni, ukulimala komuntu siqu noma ukulimala okukhulu ngokomzimba noma kwemvelo (“Imisebenzi Enobungozi Ephezulu”). I-RPL ilahla ngokuqondile noma yisiphi isiqinisekiso sokufaneleka esicacile noma esisikiselwayo sokufaneleka Kwemisebenzi Yengozi Ephezulu futhi ayamukeli icala lokusetshenziswa noma ukufakwa kwemikhiqizo ye-Raspberry Pi Emisebenzini Enobungozi Ephezulu.

Imikhiqizo ye-Raspberry Pi inikezwa ngaphansi kweMigomo Ejwayelekile ye-RPL. Ukunikezwa kwe-RPL KWEZINSIZA akukhulisi noma kuguqula Imigomo Ejwayelekile ye-RPL kuhlanganise kodwa kungagcini nje kuphela kuziqhathulula neziqinisekiso ezivezwe kuyo.

Isahluko 1. Isingeniso

Umfanekiso 1. Ukunikezwa kwe-KiCad 3D kwe-RP2350A Minimal design example

Lapho sethula okokuqala i-Raspberry Pi RP2040, siphinde sakhipha i-ex yedizayini ethi 'Minimal'ample kanye nomhlahlandlela ohambisana nayo Idizayini ye-Hardware ene-RP2040 echaza ngethemba ukuthi i-RP2040 ingasetshenziswa kanjani ebhodini lesekethe elilula, nokuthi kungani ukukhetha kwezingxenye ezihlukahlukene kwenziwa. Ngokufika kochungechunge lwe-RP235x, sekuyisikhathi sokuphinde uvakashele idizayini yokuqala ye-RP2040, futhi uyibuyekeze ukuze ihambisane nezici ezintsha, kanye nokwehluka ngakunye kwephakheji; i-RP2350A nephakheji yayo ye-QFN-60, kanye ne-RP2350B okuyi-QFN-80. Futhi, le miklamo ikufomethi ye-Kicad (7.0), futhi iyatholakala ukuthi ilandwe (https://datasheets.raspberrypi.com/rp2350/Minimal-KiCAD.zip).

Ibhodi Elincane
Ibhodi Elincane lasekuqaleni bekuwumzamo wokuhlinzeka ngomklamo olula wereferensi, kusetshenziswa ubuncane obuncane bezingxenye zangaphandle ezidingekayo ukuze kuqhutshwe i-RP2040 futhi kusenayo yonke i-IO edaluliwe futhi ifinyeleleke. Lokhu empeleni bekwakhiwa umthombo wamandla (i-5V kuya ku-3.3V yesilawuli somugqa), i-crystal oscillator, inkumbulo ye-flash, noxhumo lwe-IO (isokhethi elincane le-USB kanye nezihloko ze-GPIO). Uchungechunge olusha lwe-RP235x Amabhodi amancane ayafana, kodwa kunezinguquko ezidingekayo ngenxa yehadiwe entsha. Ngaphezu kwalokhu, futhi naphezu kokuphikisana nemvelo encane yomklamo, ngingeze izinkinobho ezimbalwa ze-bootsel futhi ngigijime, kanye nekhanda elihlukile le-SWD, okufanele lisho isipiliyoni sokususa iphutha esingakhungatheki ngokuphelele kulokhu. Imiklamo ayizidingi lezi zinkinobho, izimpawu zisatholakala kumaheda, futhi zingashiywa uma ukhathalela kakhulu izindleko noma isikhala, noma unokuthambekela kwe-masochistic.

RP2040 vs RP235x uchungechunge
Ushintsho olusobala kakhulu lusemaphaketheni. Nakuba i-RP2040 iyi-7x7mm QFN-56, uchungechunge lwe-RP235x njengamanje lunamalungu amane ahlukene. Kukhona amadivaysi amabili abelana ngephakheji elifanayo le-QFN-60; i-RP2350A engenawo ukugcinwa kwe-flash yangaphakathi, kanye ne-RP2354A enayo. Ngokufanayo, i-QFN-80 nayo iza ngama-flavour amabili; i-RP2354B ene-flash, ne-RP2350B ngaphandle. Amadivayisi e-QFN-60 kanye ne-RP2040 yasekuqaleni abelana nge-heri efanayotage.

Ngayinye inama-GPIO angu-30, amane kuwo axhumene ne-ADC, futhi angu-7x7mm ngosayizi. Ngaphandle kwalokhu, i-RP2350A ayiyona indawo yokungena ye-RP2040, njengoba inani lamaphini kulelo nalelo lihlukile. Ngokuphambene, ama-chips e-QFN-80 manje anama-GPIO angu-48, futhi ayisishiyagalombili kulawa manje aseyakwazi i-ADC. Ngenxa yalokhu, manje sesinamabhodi amabili amancane; eyodwa yemishini yamaphini angu-60, neyodwa engu-80. Lawa mabhodi amancane aklanyelwe izingxenye ezingenayo iflash yangaphakathi (RP2350), nokho amadizayini angasetshenziswa kalula namadivayisi angaphakathi e-flash (RP2354) ngokumane akhiphe ifleshi elingaphakathi. inkumbulo, noma ukuyisebenzisa njengedivaysi yesibili ye-flash (ngaphezulu kulokhu kamuva). Kunomehluko omncane phakathi kwamabhodi amabili, ngaphandle kweqiniso lokuthi inguqulo ye-QFN-80 inemigqa emide yezihloko ukuze kufakwe i-GPIO eyengeziwe, futhi ibhodi ngakho-ke likhulu.

Ngaphandle kwephakheji, umehluko omkhulu wezinga lebhodi phakathi kochungechunge lwe-RP235x ne-RP2040 yizinto zamandla. Uchungechunge lwe-RP235x lunamaphini wamandla amasha, kanye nesilawuli sangaphakathi esihlukile. Isilawuli somugqa esingu-100mA se-RP2040 sithathelwe indawo isilawuli esishintshayo esingu-200mA, futhi ngenxa yalokho, sidinga ukujikeleza okukhethekile, futhi akukho ukunakekelwa okuncane okwenziwa ngesakhiwo. Kunconywa kakhulu ukuthi ulandele eduze ukwakheka kwethu nokukhetha kwengxenye; Sesivele sidlule ebuhlungwini bokwenza iziphindaphindo ezimbalwa zomklamo, ngakho ngethemba ukuthi awudingi ukwenza kanjalo.

Umfanekiso 2. Ukunikezwa kwe-KiCad 3D kwe-RP2350B Minimal design example

Umklamo
Inhloso ye-Minimal design exampi-les iwukwenza ipheya yamabhodi alula usebenzisa uchungechunge lwe-RP235x, okufanele lube ngeshibhile futhi lwenziwe kalula, ngaphandle kokusebenzisa ubuchwepheshe be-PCB obungavamile ngokungadingekile. Ngakho-ke amabhodi amancane ayimiklamo yezendlalelo ezi-2, esebenzisa izingxenye okufanele zitholakale ngokuvamile, futhi zonke zifakwe ohlangothini olungaphezulu lwebhodi. Nakuba kungaba kuhle ukusebenzisa izinto ezinkulu ezikwazi ukudayiswa ngesandla kalula, iphimbo elincane lama-chips e-QFN (0.4mm) lisho ukuthi ukusebenzisa ezinye izingxenye ze-passive ze-0402 (1005 metric) akunakugwenywa uma wonke ama-GPIO azosetshenziswa. Nakuba izingxenye ze-0402 ze-soldering zingeyona inselele kakhulu ngensimbi enesithunzi, cishe akunakwenzeka ukudayiswa ama-QFN ngaphandle kwemishini ekhethekile.

Ezigabeni ezimbalwa ezilandelayo, ngizozama ukuchaza ukuthi umkhakha owengeziwe ungowani, futhi ngethemba ukuthi size kanjani ukuze senze izinqumo esizenzile. Njengoba empeleni ngizobe ngikhuluma ngemiklamo emibili ehlukene, eyodwa ngosayizi wephakheji ngayinye, ngizamile ukugcina izinto zilula ngangokunokwenzeka. Ngokusemandleni akho, zonke izinkomba zezingxenye zamabhodi amabili ziyefana, ngakho-ke uma ngibhekisela ku-U1, u-R1, njll, kusho ukuthi ihambisana ngokulinganayo kuwo womabili amabhodi. Okuhlukile okusobala ukuthi lapho ingxenye ikwelinye lamabhodi kuphela (kuzo zonke izimo, lokhu kuzoba kokuhluka kwamaphini angu-80), bese ingxenye okukhulunywa ngayo izoba kuphela kumklamo we-QFN-80; okwesibample, u-R13 uvela kuleli bhodi kuphela.

Isahluko 2. Amandla

Amandla kagesi ochungechunge lwe-RP235x kanye ne-RP2040 ahluka kancane kulokhu, nakuba ekucushweni kwawo okulula, kusadinga izinto ezimbili, i-3.3V ne-1.1V. Uchungechunge lwe-RP235x ngasikhathi sinye lulambele amandla amaningi, njengoba lusebenza kakhulu, futhi lungonga kakhulu (uma lusesimweni samandla aphansi) kunangaphambili, ngakho-ke isilawuli somugqa ku-RP2040 sithuthukisiwe ngesilawuli esishintshayo. Lokhu kusivumela ukuthi sisebenze kahle kakhudlwana kumaza aphezulu (afinyelela ku-200mA uma kuqhathaniswa ne-100mA ngaphambilini).

Ivolumu entsha ye-on-chiptagumlawuli

Umfanekiso 3. Isigaba sohlelo esibonisa isekethe yesilawuli sangaphakathi

Isilawuli somugqa se-RP2040 sasinamaphinikhodi amabili, okokufaka okungu-3.3V, kanye nokuphumayo okungu-1.1V ukuze kunikeze i-DVDD ku-chip. Kulokhu, umlawuli wochungechunge lwe-RP235x unezikhonkwane ezinhlanu, futhi udinga ingxenye yangaphandle ukuze alwenze lusebenze. Nakuba lokhu kubonakala kuyisinyathelo esibuyela emuva mayelana nokusebenziseka, isilawuli esishintshayo sine-advantage yokusebenzisa amandla kakhudlwana kumagagasi okulayisha aphezulu.

Njengoba igama liphakamisa, isilawuli sivula futhi sivale ngokushesha i-transistor yangaphakathi exhuma i-3.3V input vol.tage (VREG_VIN) kuphinikhodi ye-VREG_LX, futhi ngosizo lwe-inductor (L1) kanye ne-capacitor ephumayo (C7), ingakhiqiza i-DC ephumayo vol.tage eyehlisiwe kusukela kokokufakayo. Iphinikhodi ye-VREG_FB iqapha umthamo wokukhiphayotage, futhi ilungise isilinganiso sokuvula/sokuvala somjikelezo wokushintsha, ukuze kuqinisekiswe ukuthi ivolumu edingekayotage igcinwa. Njengoba amaza amakhulu ashintshwa esuka ku-VREG_VIN aye ku-VREG_LX, i-capacitor enkulu (C6) eseduze nokokufaka iyadingeka, ukuze singaphazamisi ukunikezwa kwe-3.3V kakhulu. Uma sikhuluma ngala ma-switching currents amakhulu, isilawuli siphinde sifike noxhumo lwaso lokubuyisela phansi, i-VREG_PGND. Ngokufanayo ne-VREG_VIN kanye ne-VREG_LX, ukwakheka kwalokhu kuxhumana kubalulekile, futhi ngenkathi i-VREG_PGND kufanele ixhume ku-GND eyinhloko, kufanele yenziwe ngendlela yokuthi wonke ama-switching currents amakhulu abuyele ngqo ku-PGND pin, ngaphandle kokuphazamisa ingxenye esele. iGND kakhulu.

Iphinikhodi yokugcina yi-VREG_AVDD, enikezela ngokujikeleza kwe-analogue ngaphakathi kwesilawuli, futhi lokhu kuzwela kakhulu emsindweni.

Umfanekiso 4. Isigaba sohlelo esibonisa ukwakheka kwe-PCB yesilawuli

Isakhiwo sesilawuli emabhodini amancane sifanekisela izibuko ze-Raspberry Pi Pico 2. Umsebenzi omkhulu usuwenziwe ekwakhiweni kwalesi sekethi, ngokuphindaphinda okuningi kwe-PCB edingekayo ukuze siyenze ibe yinhle ngangokunokwenzeka. kungaba. Nakuba ungase ubeke lezi zingxenye ngezindlela ezihlukahlukene futhi wenze isilawuli 'sisebenze' (okungukuthi, khiqiza ivolumu ephumayo.tage cishe ezingeni elifanele, elilungile ngokwanele ukuyithola ikhodi esebenzayo), sithole ukuthi umlawuli wethu udinga ukuphathwa ngendlela efanele ukuyigcina ijabule, futhi ngokujabula, ngiqonde ukukhiqiza ivolumu efanele yokuphumayo.tage ngaphansi kobubanzi bezimo zamanje zokulayisha.
Ngenkathi senza izivivinyo zethu kulokhu, saphoxeka ngandlela thile ukukhunjuzwa ukuthi umhlaba ongemuhle we-physics awunakushaywa indiva ngaso sonke isikhathi. Thina, njengonjiniyela, sizama kakhulu ukwenza lokhu kanye; ukwenza izinto zibe lula, ukuziba (ngokuvamile) izinto ezibonakalayo ezingabalulekile, futhi esikhundleni salokho sigxile esakhiweni esisithandayo. OkwesiboneloampI-le, i-resistor elula ayinakho nje ukumelana, kodwa futhi i-inductance, njll. Esimeni sethu, (siphinde) sithole ukuthi ama-inductors anenkundla kazibuthe ehlotshaniswa nawo, futhi okubalulekile, akhipha isiqondiso kuye ngokuthi iyiphi indlela ikhoyili. inxeba, kanye nesiqondiso sokugeleza komsinga. Siphinde sakhunjuzwa ukuthi i-inductor evikelekile 'ngokugcwele' ayisho lokho ocabanga ukuthi ingahle. Amandla kazibuthe ancipha kakhulu, kodwa amanye asabaleka. Sithole ukuthi ukusebenza kwesilawuli kungathuthukiswa kakhulu uma i-inductor 'iyindlela elungile yokuzungeza'.
Kuvele ukuthi inkambu kazibuthe ephuma ku-inductor 'yendlela engalungile' iphazamisa i-regulator output capacitor (C7), yona ephazamisa ukujikeleza kokulawula ngaphakathi kwe-RP2350. Uma i-inductor ikumumo ofanele, kanye nesakhiwo esinembayo nokukhetha kwengxenye okusetshenziswe lapha, khona-ke le nkinga iyahamba. Ngokungangabazeki kuzoba nezinye izakhiwo, izingxenye, njll, ezingase zisebenze ne-inductor kunoma yikuphi ukuma, kodwa cishe zizosebenzisa isikhala esiningi se-PCB ukuze zenze kanjalo. Sinikeze lesi sakhiwo esinconyiwe ukuze sisindise abantu amahora amaningi wobunjiniyela esiwachithe sithuthukisa futhi sicwenga lesi sixazululo esihlangene nesiziphathe kahle.
Okwengeziwe, sesihamba size sithi uma ukhetha ukungasebenzisi i-ex yethuample, bese wenza kanjalo ngokuzifaka wena engozini. Kufana nesivele sikwenza nge-RP2040 kanye nesekhethi yekristalu, lapho sigcizelela khona (kahle, siphakamisa ngokuqinile) ukuthi usebenzise ingxenye ethile (sizokwenza futhi esigabeni sekristalu salo mbhalo).
Ukuqondiswa kwalawa ma-inductors amancane akunakwa kakhulu emhlabeni wonke, njengoba ukuma kwekhoyili okujikajikayo akunakwenzeka ukuthi kuthathwe, futhi kusatshalaliswa ngokungahleliwe eceleni kwe-reel yezingxenye. Osayizi abakhulu bekesi le-inductor bavame ukutholakala benezimpawu ze-polarity, kodwa asikwazanga ukuthola abafanelekile kusayizi wekesi elingu-0806 (2016 metric) esilikhethile. Kuze kube manje, sisebenze no-Abracon ukukhiqiza ingxenye engu-3.3μH enechashazi ukukhombisa i-polarity, futhi okubalulekile, yiza nge-reel nazo zonke ziqondaniswe ngendlela efanayo. I-TBD (noma izotholakala maduze) kumphakathi jikelele kusuka kubasabalalisi. Njengoba kushiwo ngaphambili, ukunikezwa kwe-VREG_AVDD kuzwela kakhulu emsindweni, ngakho-ke kudinga ukuhlungwa. Sithole ukuthi njengoba i-VREG_AVDD idonsa kuphela u-200μA, isihlungi se-RC esingu-33Ω no-4.7μF sanele.
Ngakho-ke, ukuphindaphinda, izingxenye ezisetshenzisiwe zizoba…
- I-C6, C7 & C9 – 4.7μF (0402, 1005 metric)
- I-L1 – Abracon TBD (0806, 2016 metric)
- I-R3 – 33Ω (0402, 1005 metric)
Idatha ye-RP2350 inengxoxo enemininingwane eyengeziwe mayelana nezincomo zesakhiwo somlawuli, sicela ubheke Izingxenye Zangaphandle kanye nezidingo zesakhiwo se-PCB.

Ukunikezwa kokokufaka

Ukuxhumeka kwamandla okokufaka kwalo mklamo kungephinikhodi engu-5V VBUS yesixhumi se-Micro-USB (ebhalwe ukuthi J1 kumfanekiso 5). Lena indlela evamile yokunika amandla amadivayisi kagesi, futhi kunengqondo lapha, njengoba i-RP2350 inokusebenza kwe-USB, esizobe siwafaka kumaphini edatha alesi sixhumi. Njengoba sidinga kuphela i-3.3V kulo mklamo (ukunikezwa kwe-1.1V kuvela ngaphakathi), sidinga ukwehlisa ukunikezwa kwe-USB ye-5V engenayo, kulokhu, sisebenzisa enye, ivolumu yangaphandle.tage-regulator, kulokhu isilawuli esilandelanayo (osaziwa nangokuthi isilawuli se-Low Drop Out, noma i-LDO). Njengoba ngike ngancoma ubuhle bokusebenzisa isilawuli sokushintshwa esisebenzayo, kungase futhi kube ukukhetha okuhlakaniphile ukusebenzisa nalapha, kodwa ngikhethe ukwenza izinto zibe lula. Okokuqala, ukusebenzisa i-LDO cishe kuhlale kulula. Azikho izibalo ezidingekayo ukuze uthole ukuthi iyiphi i-inductor kasayizi okufanele uyisebenzise, noma makhulu kangakanani ama-capacitor okukhiphayo, futhi isakhiwo ngokuvamile siqonde kakhulu. Okwesibili, ukonga wonke amandla okugcina akuyona inhloso lapha; uma bekunjalo, bengizocabangela ukusebenzisa isilawuli esishintshayo, futhi ungathola i-example yokwenza kanjalo ku-Raspberry Pi Pico 2. Futhi okwesithathu, ngingakwazi kalula 'ukuboleka' isekethe engangiyisebenzise ngaphambilini kunguqulo ye-RP2040 yebhodi elincane. I-NCP1117 (U2) ekhethwe lapha inokukhipha okungaguquki kwe-3.3V, itholakala kabanzi, futhi inganikeza kufika ku-1A yamanje, okuzoba inala kumadizayini amaningi. Ukubheka idatha yedatha ye-NCP1117 kusitshela ukuthi le divayisi idinga i-capacitor engu-10μF kokokufakayo, nenye kokuphumayo (C1 ne-C5).

I-Decoupling capacitor

Umfanekiso 6. Isigaba sohlelo esibonisa okokufaka kokuphakelwa kwamandla ka-RP2350, voltagi-e regulator kanye nama-decoupling capacitors

Esinye isici somklamo wokuphakelwa kwamandla ama-decoupling capacitor adingekayo ku-RP2350. Lezi zihlinzeka ngemisebenzi emibili eyisisekelo. Okokuqala, bahlunga umsindo wokuphakelwa kwamandla, futhi okwesibili, banikeze ukushaja kwasendaweni okungasetshenziswa amasekethe angaphakathi kwe-RP2350 ngesaziso esifushane. Lokhu kuvimbela i-voltagIleveli endaweni eseduze ukusuka ekwehleni kakhulu lapho isidingo samanje sikhuphuka ngokuzumayo. Ngoba, kulokhu, kubalulekile ukubeka i-decoupling eduze nezikhonkwane zamandla. Ngokujwayelekile, sincoma ukusetshenziswa kwe-capacitor engu-100nF ngephinikhodi yamandla ngayinye, nokho, siyachezuka kulo mthetho ezimeni ezimbalwa.

Umfanekiso 7. Ingxenye yesakhiwo esibonisa i-RP2350 ukuzulazula nokuhlukanisa

Okokuqala, ukuze sikwazi ukuba nesikhala esanele sokuthi zonke izikhonkwane ze-chip zikwazi ukukhishelwa ngaphandle, kude nedivayisi, kufanele sithobe nenani lama-decoupling capacitor esingawasebenzisa. Kulo mklamo, izikhonkwane ezingu-53 no-54 ze-RP2350A (izikhonkwane ezingu-68 nezingu-69 ze-RP2350B) zabelana nge-capacitor eyodwa (C12 ku-Figure 7 kanye noMfanekiso 6), njengoba lingekho isikhala esiningi kulelo hlangothi lwedivayisi, kanye nezingxenye. futhi ukwakheka komlawuli kuza kuqala.
Lokhu kuntuleka kwesikhala kunganqotshwa ngandlela thize uma sisebenzisa ubuchwepheshe obuyinkimbinkimbi/emba eqolo, njengezinto ezincane, noma i-PCB esendlalelo ezine enezingxenye kuzo zombili izinhlangothi ezingaphezulu neziphansi. Lokhu ukuhwebelana komklamo; sehlise ubunkimbinkimbi nezindleko, ngezindleko zokuba namandla amancane okuqaqa, nama-capacitor aqhelelene kancane ne-chip kune-optimal (lokhu kwandisa inductance). Lokhu kungaba nomthelela wokukhawulela isivinini esikhulu umklamo ongasebenza ngaso, njenge-voltagI-e supply ingaba nomsindo kakhulu futhi yehle ngaphansi kwevolumu encane evunyelwetage; kodwa ezicelweni eziningi, lokhu kuhwebelana kufanele kwamukeleke.

Okunye ukuchezuka kumthetho we-100nF ukuthi sikwazi ukuthuthukisa ivolumutagukusebenza komlawuli; sincoma ukusebenzisa i-4.7μF ye-C10, ebekwe ngakolunye uhlangothi lwe-chip kusuka kusilawuli.

Isahluko 3. Inkumbulo ye-Flash

I-flash eyinhloko

Umfanekiso 8. Isigaba sohlelo esibonisa inkumbulo eyisifuleshi eyinhloko kanye nesekhethi ye-USB_BOOT

Ukuze ukwazi ukugcina ikhodi yohlelo i-RP2350 engakwazi ukuyiqalisa futhi iqalise, sidinga ukusebenzisa inkumbulo ekhanyayo, ikakhulukazi, inkumbulo ye-quad SPI flash. Idivayisi ekhethwe lapha iyidivayisi ye-W25Q128JVS (U3 kumfanekiso 8), okuyi-chip engu-128Mbit (16MB). Lona usayizi wenkumbulo omkhulu kakhulu ongasekelwa yi-RP2350. Uma uhlelo lwakho lokusebenza lungadingi isitoreji esiningi kangako, inkumbulo encane, eshibhile ingasetshenziswa esikhundleni salokho.
Njengoba le dathabhasi ingaba imvamisa ephezulu kakhulu futhi isetshenziswa njalo, izikhonkwane ze-QSPI ze-RP2350 kufanele zifakwe izintambo ngokuqondile ku-flash, kusetshenziswa ukuxhumeka okufushane ukuze kugcinwe ubuqotho besignali, futhi nokunciphisa i-crosstalk kumasekhethi azungezile. I-Crosstalk yilapho amasiginali kwinethi yesekethe eyodwa angangenisa ivolumu engadingekitagkusekethe engumakhelwane, okungase kubangele ukuthi kwenzeke amaphutha.

Isiginali ye-QSPI_SS iyisimo esikhethekile. Ixhunywe ku-flash ngokuqondile, kodwa futhi inama-resistors amabili (kahle, amane, kodwa ngizofika kulokho kamuva) exhunywe kuyo. Eyokuqala (R1) iwukudonsela phezulu kumphakeli we-3.3V. Imemori ye-flash idinga okokufaka okukhethiwe kwe-chip ukuthi kube ngevolumu efanayotage njengephinikhodi yayo yokuhlinzeka nge-3.3V njengoba idivayisi inikwa amandla, uma kungenjalo, ayisebenzi ngendlela efanele. Uma i-RP2350 inikwa amandla, iphinikhodi yayo ye-QSPI_SS izozenzakalelayo ngokuzenzakalelayo ekudonseleni phezulu, kodwa kunesikhathi esifushane phakathi nokuvula lapho isimo sephinikhodi ye-QSPI_SS singenakuqinisekiswa khona. Ukwengezwa komphikisi wokudonsela phezulu kuqinisekisa ukuthi le mfuneko izohlala yaneliswa. I-R1 imakwe njenge-DNF (Do Not Fit) kuhlelo, njengoba sithole ukuthi ngale divayisi yeflashi ethile, ukudonsa kwangaphandle akudingekile. Nokho, uma kusetshenziswa ifleshi ehlukile, kungase kubaluleke ukwazi ukufaka i-resistor engu-10kΩ lapha, ngakho ifakiwe uma kwenzeka.
I-resistor yesibili (i-R6) iyi-resistor engu-1kΩ, exhunywe kwinkinobho yokuphusha (SW1) enelebuli ethi 'USB_BOOT'. Lokhu kungenxa yokuthi iphinikhodi ye-QSPI_SS isetshenziswa 'njengebhande lokuqalisa'; I-RP2350 ihlola inani lale I/O ngesikhathi sokulandelana kwebhuthi, futhi uma itholakala iyi-logic engu-0, bese i-RP2350 ibuyela kumodi ye-BOOTSEL, lapho i-RP2350 iziveza khona njengedivayisi yokugcina inqwaba ye-USB, futhi ikhodi ingakopishwa ngokuqondile. kuyo. Uma simane sicindezela inkinobho, sidonsela phansi iphinikhodi ye-QSPI_SS, futhi uma idivayisi ngemva kwalokho isethwa kabusha (isb ngokuguqula iphinikhodi ye-RUN), i-RP2350 izoqala kabusha ngemodi ye-BOOTSEL esikhundleni sokuzama ukuqalisa okuqukethwe kwefuleshi. Lezi zinto eziphikisayo, i-R2 ne-R6 (i-R9 ne-R10 nazo), kufanele zibekwe eduze ne-flash chip, ukuze sigweme ubude obengeziwe bamathrekhi ethusi obungathinta isignali.
Konke lokhu okungenhla kusebenza ngqo ku-RP2350, engenakho ukukhanya kwangaphakathi. Vele, amadivaysi e-RP2354 anezinkumbulo ze-flash zangaphakathi ezingu-2MB, ngakho-ke inkumbulo ye-U3 yangaphandle ayidingeki, ngakho-ke i-U3 ingasuswa ngokuphephile kuhlelo, noma ivele ishiywe ingenamuntu. Kuzo zombili lezi zimo, sisazofuna ukugcina iswishi ye-USB_BOOT ixhumeke ku-QSPI_SS, ukuze sisakwazi ukufaka imodi yokuqalisa ye-USB.

I-flash yesibili noma i-PSRAM

Uchungechunge lwe-RP235x manje lusekela idivayisi yesibili yenkumbulo esebenzisa izikhonkwane ze-QSPI ezifanayo, ne-GPIO ehlinzeka ngokukhetha kwe-chip eyengeziwe. Ngakho-ke, uma sisebenzisa i-RP2354 (ene-flash yangaphakathi), singase sisebenzise i-U3 njengesibani sesibili, noma siyishintshe sifake idivayisi ye-PSRAM. Ukuze senze lokhu, sidinga ukunqamula i-QSPI_SS ku-U3, futhi esikhundleni salokho siyixhume ku-GPIO efanelekile. I-GPIO eseduze ekwazi ukuba ukukhetha kwe-chip (XIP_CS1n) i-GPIO0, ngakho-ke ngokukhipha i-0Ω ku-R10, futhi iyifake ku-R9, manje sesingakwazi ukufinyelela ku-U3 ngaphezu kwe-on-chip flash. Ukuze uthathe i-advan ngokugcweletage yalesi sici, lapho sinemishini emibili yenkumbulo yangaphandle ukuze izingxenye ze-RP2350 ezingenabani zizuze, elikhulu lamabhodi amabili Amancane, we-RP2350B, afaka phakathi indawo ongakhetha kuyo (U4) ye-chip yememori eyengeziwe.

Umfanekiso 9. Ingxenye yohlelo ekhombisa idivayisi yenkumbulo yesibili ozikhethela yona

Ukuze ukwazi ukusebenzisa le divayisi, ngokusobala kuzodingeka igcwaliswe , kanye no-R11 (0Ω), kanye no-R13 (10KΩ). Ukwengezwa kwe-R11 kuxhuma i-GPIO0 (isiginali ye-XIP_CS1n) ekukhethweni kwe-chip yememori yesibili. Ukudonsela phezulu kuphinikhodi yokukhetha i-chip kuyadingeka ngempela ngalesi sikhathi, njengoba isimo esizenzakalelayo se-GPIO0 sizodonswa phansi ekunyuseni amandla, okungabangela ukuthi idivayisi yethu ye-flash ihluleke. I-C22 nayo izodingeka ukuze kuhlinzekwe ngokunqanyulwa kukagesi wendawo ku-U4.

Ama-flash chips asekelwe
Ukulandelana kwe-flash probe yokuqala, esetshenziswa phansi ukukhipha u-s wesibilitage kusuka ku-flash, isebenzisa umyalo wokufundwa kwe-serial ongu-03h, onokukhuluma okungu-24-bit, kanye newashi lomkhiqizo cishe elingu-1MHz. Ijikeleza ngokuphindaphindiwe ezinhlanganisela ezine zewashi nesigaba sewashi, ibheka isekhondi elivumelekile.tage CRC32 checksum.
Njengoba u-s wesibilitagI-e isuke isikhululekile ukumisa ukwenza endaweni kusetshenziswa umyalo ofanayo wokufundwa kwe-serial ongu-03h, i-RP2350 ingakwazi ukwenza i-flash cached execute-in-place nanoma iyiphi i-chip esekela u-03h ifundwe nge-serial engama-24-bit, ehlanganisa iningi lamadivayisi we-flash ochungechunge lwama-25. . I-SDK inikeza i-example yesibili stage-CPOL=0 CPHA=0, ngo- https://github.com/raspberrypi/pico-sdk/blob/master/src/rp2350/boot_stage2/boot2_generic_03h.S. Ukuze usekele uhlelo lwe-flash usebenzisa izinqubo ezingezansi , idivayisi kufanele futhi iphendule kumiyalo elandelayo:

02h 256-byte uhlelo lwekhasi
05h irejista yesimo ifundiwe
06h setha bhala vumela i-latch

20h 4kB umkhakha ukusula

I-RP2350 futhi isekela izinhlobo eziningi zokufinyelela ezikabili-SPI kanye ne-QSPI. Okwesiboneloample, https://github.com/raspberrypi/pico-sdk/blob/master/src/rp2350/boot_stage2/boot2_w25q080.S ilungiselela idivayisi ye-Winbond W25Q-series yemodi yokufunda okuqhubekayo ye-quad-IO, lapho i-RP2350 ithumela amakheli e-quad-IO (ngaphandle kwesiqalo somyalo) futhi i-flash iphendula ngedatha ye-quad-IO.

Kudingeka ukuqapha okuthile ngamamodi e-flash XIP lapho idivayisi ye-flash iyeka ukuphendula kumiyalo ye-serial evamile, njengemodi yokufunda eqhubekayo ye-Winbond eshiwo ngenhla. Lokhu kungase kubangele izinkinga uma i-RP2350 isethwa kabusha, kodwa idivayisi ye-flash ayijikeleziswa amandla, ngoba i-flash ngeke iphendule ngokulandelana kwe-flash probe ye-bootrom. Ngaphambi kokukhipha uchungechunge lwe-03h olufundiwe, i-bootrom ihlale ikhipha ukulandelana okungaguquki okulandelayo, okuwumzamo ongcono kakhulu wokulandelana wokuyekisa i-XIP kuhlu lwamadivaysi e-flash:

CSn=1, IO[3:0]=4'b0000 (ngokudonsela phansi ukuze ugweme umbango), khipha amawashi angu-×32
CSn=0, IO[3:0]=4'b1111 (ngokudonsa phezulu ukuze ugweme umbango), khipha amawashi angu-×32
I-CSn=1

CSn=0, MOSI=1'b1 (driven low-Z, all other I/Os Hi-Z), khipha ×16 amawashi

Uma idivayisi yakho ekhethiwe ingasabeli kulolu chungechunge uma ikumodi yayo eqhubekayo yokufunda, kufanele igcinwe esimweni lapho ukudluliswa ngakunye kunesiqalo ngomyalo we-serial, ngaphandle kwalokho i-RP2350 ngeke ikwazi ukuphinda ithole ngemva kokusetha kabusha kwangaphakathi.
Ukuze uthole imininingwane eyengeziwe nge-QSPI, sicela ubheke i-QSPI Memory Interface (QMI) kumininingwane ye-RP2350.

Isahluko 4. I-Crystal Oscillator

Umfanekiso 10. Isigaba se-Schematic esibonisa i-crystal oscillator kanye nama-capacitor okulayisha

Uma sikhuluma ngokuqinile, i-RP2350 empeleni ayidingi umthombo wewashi wangaphandle, njengoba ine-oscillator yayo yangaphakathi. Kodwa-ke, njengoba imvamisa yale oscillator yangaphakathi ingachazwanga kahle noma ingalawulwa, ihluka ukusuka ku-chip kuye ku-chip, kanye ne-voltage ehlukile yokunikezela.tages namazinga okushisa, kunconywa ukusebenzisa umthombo ozinzile wemvamisa yangaphandle. Izinhlelo zokusebenza ezithembele kumafrikhwensi afanayo azinakwenzeka ngaphandle komthombo wamafrikhwensi wangaphandle, i-USB iyi-ex eyinhlokoample.
Ukuhlinzeka ngomthombo wamafrikhwensi wangaphandle kungenziwa ngendlela eyodwa kwezimbili: ngokuhlinzeka ngomthombo wewashi onokuphuma kwe-CMOS (i-square wave ye-IOVDD vol.tage) kuphinikhodi ye-XIN, noma ngokusebenzisa ikristalu engu-12MHz exhunywe phakathi kwayo
I-XIN ne-XOUT. Ukusebenzisa ikristalu inketho ekhethwayo lapha, njengoba zombili ishibhile futhi zinembile kakhulu.

Ikristalu ekhethiwe yalo mklamo i-ABM8-272-T3 (Y1 ku-Figure 10). Lena yikristalu engu-12MHz efanayo esetshenziswe ku-Raspberry Pi Pico naku-Raspberry Pi Pico 2. Sincoma kakhulu ukusebenzisa le crystal kanye nokujikeleza okuhambisanayo ukuze siqinisekise ukuthi iwashi liqala ngokushesha ngaphansi kwazo zonke izimo ngaphandle kokulimaza ikristalu ngokwayo. Ikristalu inokubekezelela imvamisa okungu-30ppm, okufanele ibe yinhle ngokwanele ezinhlelweni eziningi. Kanye nokubekezelela imvamisa okungu-+/-30ppm, ine-ESR ephezulu engu-50Ω, namandla okulayisha angu-10pF, womabili abe nomthelela ekukhethweni kwezingxenye ezihambisanayo.
Ukuze ikristalu igeze ngemvamisa oyifunayo, umkhiqizi ucacisa amandla omthwalo awadingayo ukuze enze njalo, futhi kulokhu, ngu-10pF. Le capacitance yomthwalo itholakala ngokubeka ama-capacitor amabili anenani elilinganayo, elilodwa ohlangothini ngalunye lwe-crystal kuya phansi (C3 ne-C4). Kusukela iphuzu crystal of view, lawa ma-capacitor axhunywe ochungechungeni phakathi kwamatheminali awo amabili. I-Basic circuit theory isitshela ukuthi ihlanganisa ukunikeza amandla okuthi (C3*C4)/(C3+C4), futhi njengokuthi C3=C4, bese kuba u-C3/2 nje. Kulesi example, sisebenzise ama-capacitor angu-15pF, ngakho-ke inhlanganisela yochungechunge ingu-7.5pF. Ngokungeziwe kulo mthamo wamabomu womthwalo, kufanele futhi sengeze inani lamandla angeziwe ngokungahlosiwe, noma amandla e-parasitic, esiwathola kumathrekhi e-PCB kanye nezikhonkwane ze-XIN ne-XOUT ze-RP2350. Sizothatha inani elingu-3pF kulokhu, futhi njengoba leli khono lihambisana ne-C3 kanye ne-C4, sivele sengeze lokhu ukuze kusinike umthamo ophelele wokulayisha ongu-10.5pF, osondele ngokwanele kulokho okuhlosiwe okungu-10pF. Njengoba ubona, amandla e-parasitic we-PCB traces ayingxenye, ngakho-ke sidinga ukuwagcina emincane ukuze singacasuli ikristalu futhi siyimise ukugoqa njengoba kuhlosiwe. Zama futhi ugcine isakhiwo sifushane ngangokunokwenzeka.
Ukucatshangelwa kwesibili yi-ESR ephezulu (ukumelana nochungechunge olulinganayo) lwekristalu. Sikhethe idivayisi enobukhulu obungu-50Ω, njengoba sithole ukuthi lokhu, kanye ne-1kΩ series resistor (R2), kuyinani elihle lokuvimbela ikristalu ukuthi ishayeke kakhulu futhi yonakaliswe uma usebenzisa i-IOVDD. izinga 3.3V. Kodwa-ke, uma i-IOVDD ingaphansi kwe-3.3V, khona-ke idrayivu yamanje yezikhonkwane ze-XIN/XOUT iyancishiswa, futhi uzothola ukuthi ampI-litude ye-crystal iphansi, noma ingase ingashintshi nhlobo. Kulokhu, inani elincane le-resistor yochungechunge kuzodingeka lisetshenziswe. Noma yikuphi ukuchezuka kumjikelezo wekristalu oboniswe lapha, noma ngezinga le-IOVDD ngaphandle kwe-3.3V, kuzodinga ukuhlolwa okubanzi ukuze kuqinisekiswe ukuthi ikristalu i-oscillates ngaphansi kwazo zonke izimo, futhi iqala ngokushesha ngokwanele ukuze ingabangeli izinkinga ngohlelo lwakho lokusebenza.

Ikristalu enconyiwe

Ngemiklamo yoqobo esebenzisa i-RP2350 sincoma ukusebenzisa i-Abracon ABM8-272-T3. Okwesiboneloample, ngaphezu komklamo omncane example, bona uhlelo lwebhodi le-Pico 2 ku-Appendix B ye-Raspberry Pi Pico 2 Datasheet kanye nomklamo we-Pico 2 files.
Ukuze uthole ukusebenza okuhle kakhulu nokuzinza kuwo wonke amazinga okushisa ajwayelekile okusebenza, sebenzisa i-Abracon ABM8-272-T3. Ungathola i-ABM8-272-T3 ngokuqondile kwa-Abracon noma kumthengisi ogunyaziwe. I-Pico 2 ishunwe ngokukhethekile i-ABM8-272-T3, enalezi zici ezilandelayo:

Ngisho noma usebenzisa i-crystal enezincazelo ezifanayo, uzodinga ukuhlola isifunda phezu kohlu lwamazinga okushisa ukuze uqinisekise ukuzinza.
I-crystal oscillator inikwa amandla kusukela ku-IOVDD voltage. Njengomphumela, ikristalu ye-Abracon kanye nalokho dampI-resistor ye-ing ivulelwe ukusebenza kwe-3.3V. Uma usebenzisa ivolumu ye-IO ehlukiletage, uzodinga ukushuna kabusha.
Noma yiziphi izinguquko kumapharamitha ekristalu zisengozini yokungazinzi kuzo zonke izingxenye ezixhunywe kumjikelezo wekristalu.

Uma ungakwazi ukuthola ikristalu enconyiwe ngokuqondile kwa-Abracon noma umdayisi, xhumana naye applications@raspberrypi.com.

Isahluko 5. Ama-IO

I-USB
Umfanekiso 11. Isigaba sohlelo esibonisa izikhonkwane ze-USB ze-RP2350 kanye nokuqedwa kochungechunge

I-RP2350 ihlinzeka ngezikhonkwane ezimbili ezizosetshenziselwa isivinini esigcwele (FS) noma isivinini esiphansi (LS) USB, njengomsingathi noma idivayisi, kuye ngesofthiwe esetshenzisiwe. Njengoba sesixoxile, i-RP2350 ingakwazi futhi ukuqalisa njengedivayisi yokugcina inqwaba ye-USB, ngakho ukuxhuma la maphini kusixhumi se-USB (J1 kumfanekiso 5) kunengqondo. Amaphinikhodi e-USB_DP kanye ne-USB_DM ku-RP2350 awadingi okunye ukudonsela phezulu noma ukudonsela phansi (okudingekayo ukuze kuboniswe isivinini, i-FS noma i-LS, noma ukuthi umsingathi noma idivayisi), njengoba lokhu kwakhelwe kuma-I/Os. Kodwa-ke, lawa ma-I/O adinga izimbangi zokunqanyulwa kochungechunge ezingu-27Ω (i-R7 ne-R8 kumfanekiso 11), ezibekwe eduze ne-chip, ukuze kuhlangatshezwane nokucaciswa kokuphazamiseka kwe-USB.
Noma i-RP2350 ikhawulelwe esilinganisweni sedatha yesivinini esigcwele (12Mbps), kufanele sizame futhi siqinisekise ukuthi isici sezintambo zokudlulisela (amathrekhi ethusi axhuma i-chip kusixhumi) aseduze
Ukucaciswa kwe-USB okungu-90Ω (kukalwa ngokwehlukana). Ebhodini eliwugqinsi elingu-1mm elifana naleli, uma sisebenzisa amathrekhi abanzi angu-0.8mm ku-USB_DP naku-USB_DM, enegebe elingu-0.15mm phakathi kwawo, kufanele sithole isici esihlukanisayo esingaba ngu-90Ω. Lokhu okokuqinisekisa ukuthi amasignali angakwazi ukuhamba kulayini wokudlulisela ngokuhlanzeka ngangokunokwenzeka, kuncishiswe ivolumutage ukuboniswa okunganciphisa ubuqotho besignali. Ukuze lezi zintambo zikagesi zisebenze kahle, sidinga ukwenza isiqiniseko sokuthi ngaphansi kwalezi zintambo kukhona isisekelo. Indawo eqinile, engaphazamiseki yethusi ephansi, enweba bonke ubude bethrekhi. Kulo mklamo, cishe lonke ungqimba lwethusi oluphansi lunikezelwa phansi, futhi ukunakekelwa okukhethekile kwathathwa ukuze kuqinisekiswe ukuthi amathrekhi e-USB awadluli lutho ngaphandle komhlabathi. Uma i-PCB ewugqinsi kuno-1mm ikhethelwa ukwakha kwakho, khona-ke sinezinketho ezimbili. Singakwazi ukwenza kabusha izintambo zokudlulisa i-USB ukuze sinxephezele ibanga elikhulu phakathi kwethrekhi nomhlabathi ngaphansi (okungaba yinto engenakwenzeka ngokomzimba), noma singakuziba, futhi sithembe okungcono kakhulu. I-USB FS ingathethelela impela, kepha ibanga lakho lingahluka. Kungenzeka ukuthi isebenze ezinhlelweni eziningi, kodwa ngeke ihambisane nezinga le-USB.

I/O izihloko

Umfanekiso 12. Isigaba sohlelo esibonisa izihloko ezingu-2.54mm I/O zenguqulo ye-QFN60

Ngaphezu kwesixhumi se-USB esesishiwo, kukhona izihloko ezimbili zemigqa engu-2.54mm (J2 kanye ne-J3 kuMfanekiso 12), eyodwa ohlangothini ngalunye lwebhodi, lapho amanye ama-I/O axhunywe kuwo. Kunama-GPIO angama-30 ku-RP2350A, kuyilapho kukhona angu-48 GPIO ku-RP2350B, ngakho izihloko kule nguqulo yebhodi elincane zikhulu ukuvumela izikhonkwane ezengeziwe (bona uMfanekiso 13).
Njengoba lokhu kuwumklamo wenjongo evamile, ngaphandle kokusetshenziswa okuthile engqondweni, i-I/O yenziwe yatholakala ukuze ixhunywe njengokufisa komsebenzisi. Umugqa wangaphakathi wamaphini kunhlokweni ngayinye ama-I/O, futhi umugqa ongaphandle wonke uxhumeke phansi. Kungumkhuba omuhle ukufaka izizathu eziningi kuzixhumi ze-I/O. Lokhu kusiza ukugcina indawo ephansi ye-impedance, kanye nokuhlinzeka ngezindlela eziningi zokubuya ezingase zibe khona zamagagasi ahambayo aye futhi abuye
I/O ukuxhumana. Lokhu kubalulekile ukuze kuncishiswe ukuphazamiseka kwe-electro-magnetic okungabangelwa ukubuya kwamaza okushintsha ngokushesha amasiginali athatha izindlela ezinde, ezilengayo ukuze kuqedelwe ukujikeleza.

Zombili izihloko zikugridi efanayo engu-2.54mm, okwenza ukuxhuma leli bhodi kwezinye izinto, njengamabhodi esinkwa, kube lula. Ungase uthande ukucabangela ukufaka unhlokweni womugqa owodwa kuphela esikhundleni sikanhlokweni wemigqa emibili, ukhiphe umugqa wangaphandle wokuxhunywa komhlaba, ukuze ukwenze kube lula ukungena ebhodini lezinkwa.

Umfanekiso 13. Isigaba sohlelo esibonisa izihloko ezingu-2.54mm I/O zenguqulo ye-QFN80

Susa iphutha

Umfanekiso 14. Isigaba sohlelo esibonisa isixhumi se-JST ongasikhetha sokulungisa iphutha le-SWD

Ngokulungisa iphutha ku-chip, ungase ufise ukuxhuma kusixhumi esibonakalayo se-SWD se-RP2350. Amaphini amabili, i-SWD ne-SWCLK, ayatholakala kunhlokweni engu-2.54mm, J3, ukuvumela uphenyo lokususa iphutha olikhethayo ukuthi luxhumeke kalula. Ngaphezu kwalokhu, ngifake unhlokweni oyinketho we-JST, ovumela ukuxhumana okulula ku-Raspberry Pi Debug Probe. Awudingi ukusebenzisa lokhu, izihloko ze-2.54mm zizokwanela uma uhlose ukulungisa isofthiwe, kodwa ngikuthola kulula kakhulu ukwenza kanjalo. Ngikhethe isixhumi esivundlile, ikakhulukazi ngoba ngithanda ukubukeka kwaso, noma singekho onqenqemeni lwebhodi, kodwa ezime mpo ziyatholakala, yize zinonyawo oluhluke kancane.

Izinkinobho
Idizayini encane manje ayiqukethe eyodwa, kodwa izinkinobho ezimbili, lapho inguqulo ye-RP240 yayingenayo. Eyodwa eyokukhetha ibhuthi ye-USB njengoba sike saxoxa ngayo ngaphambili, kodwa eyesibili iyinkinobho 'yokusetha kabusha', exhunywe kuphinikhodi ye-RUN. Akukho kulokhu okudingeka kakhulu (nakuba inkinobho ye-BOOTSEL kuzodingeka ukuthi ithathelwe indawo unhlokweni noma okufanayo uma kudingeka imodi yokuqalisa ye-USB), futhi ingasuswa uma isikhala noma izindleko zikhathaza, kodwa ngokuqinisekile zenza ukusebenzisa i-RP2350 kube kude. isipiliyoni esimnandi.

Isithasiselo A: Inguqulo ephelele ye-Schematic -RP2350A

Umfanekiso 15. Isikimu esigcwele Sokuklama Okuncane kwe-RP2350A

Isithasiselo B: Inguqulo ephelele ye-Schematic -RP2350B

Umfanekiso 16. Isikimu esigcwele Sokuklama Okuncane kwe-RP2350B

Isithasiselo H: Umlando Wokukhishwa Kwemibhalo

Agasti 8 2024
Ukukhishwa kokuqala.

kanye ne-Raspberry Pi
I-Raspberry Pi inguphawu lokuthengisa lwe-Raspberry Pi Ltd
Inkampani Raspberry Pi Ltd

Amadokhumenti / Izinsiza

I-Raspberry Pi SC1631 Raspberry Microcontroller [pdf] Incwadi Yeziqondiso
SC1631 Raspberry Microcontroller, SC1631, Raspberry Microcontroller, Microcontroller

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I-Raspberry Pi SC1631 Raspberry Microcontroller

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