Raspberry Pi SC1631 Raspberry Microcontroller Phau Ntawv Qhia

Tshooj 1: Kev Taw Qhia
RP2350 series muaj cov kev xaiv pob sib txawv piv rau RP2040 series. Lub RP2350A thiab RP2354A tuaj nyob rau hauv ib pob QFN-60 yam tsis muaj thiab nrog flash cia sab hauv, thaum lub RP2354B thiab RP2350B tuaj hauv QFN-80 pob nrog thiab tsis muaj flash cia.

Tshooj 2: Lub zog
RP2350 series nta ib qho tshiab ntawm-chip hloov voltage regulator nrog tsib tus pin. Qhov kev tswj hwm no yuav tsum muaj cov khoom siv sab nraud rau kev ua haujlwm tab sis muaj kev ua haujlwm siab dua ntawm cov khoom siv hluav taws xob ntau dua piv rau cov kab hluav taws xob hauv RP2040 series. Ua tib zoo mloog rau lub suab rhiab heev hauv VREG_AVDD tus pin uas muab cov analogue circuitry.

Cov lus nug nquag nug (FAQ)

Q: Dab tsi yog qhov txawv ntawm RP2350A thiab RP2350B?
A: Qhov sib txawv tseem ceeb nyob rau hauv lub xub ntiag ntawm sab hauv flash cia. RP2350A tsis muaj flash cia sab hauv thaum RP2350B ua.
Q: Muaj pes tsawg tus pins voltage regulator hauv RP2350 series muaj?
A: The voltage regulator hauv RP2350 series muaj tsib tus pins.

Kho vajtse tsim nrog RP2350 Siv RP2350 microcontrollers los tsim cov laug cam thiab cov khoom

Colophon

Cov ntaub ntawv no tau tso cai raws li Creative Commons Attribution-NoDerivatives 4.0 International (CC BY-ND). Hnub tim: 2024-08-08 build-version: c0acc5b-huv
Daim ntawv ceeb toom tsis lees paub raws cai

RASPBERRY PI LTD cov khoom siv (nrog rau cov ntaub ntawv) raws li kev hloov kho los ntawm lub sijhawm mus rau SIJHAWM ("QHIA") yog muab los ntawm RASPBERRY PI LTD ("RPL") "LUB TSEEM CEEB" THIAB TSEEM CEEB OT LIMITED TAM SIM NO YUAV TSUM TAU TXAIS NTAWM MERCHANTABILITY THIAB FITNESS FOR A PARTICULAR PURPOSE are disclaimed. TXOJ HAUJ LWM NTAWM TXOJ HAUJ LWM NTAWM TXOJ HAUJ LWM NTAWM TXOJ CAI NTAWM LUB TSEV KAWM NTAWV YUAV TSUM TAU TXAIS KEV PAB CUAM TSHUAJ TIV THAIV, INDIRECT, INCIDENTAL, Tshwj xeeb, qauv, lossis kev puas tsuaj tshwm sim (nrog rau, TAB SIS TSEEM CEEB, KEV PAB CUAM; , LOSSIS NYIAJ NYIAJ NYIAJ HAUJ LWM HAUV LUB CHAW UA HAUJ LWM HAUJ LWM HAUJ LWM HAUJ LWM HAUJ LWM HAUJ LWM HAUV LUB CHAW UA HAUJ LWM HAUV LUB SIJ HAWM NTAWM LUB SIJ HAWM NTAWM LUB SIJ HAWM NTAWM LUB SIJ HAWM NTAWM LUB SIJ HAWM NTAWM LUB SIJ HAWM NTAWM LUB SIJ HAWM NTAWM LUB SIJ HAWM YOG NTAWM POSSIBILITY LOS NTAWM CHAW UA HAUJ LWM.
RPL muaj txoj cai los ua kom muaj kev txhim kho, txhim kho, kho lossis lwm yam kev hloov kho rau RESOURCES lossis ib yam khoom uas tau piav qhia hauv lawv txhua lub sijhawm thiab tsis tas yuav ceeb toom ntxiv.
RESOURCES yog tsim los rau cov neeg txawj ntse nrog rau theem tsim kev paub tsim. Cov neeg siv tsuas yog lub luag haujlwm rau lawv txoj kev xaiv thiab siv cov RESOURCES thiab txhua daim ntawv thov ntawm cov khoom tau piav qhia hauv lawv. Tus neeg siv pom zoo rau kev them nyiaj thiab tuav RPL yam tsis muaj kev phom sij rau txhua qhov kev lav phib xaub, cov nqi, kev puas tsuaj lossis lwm yam kev poob uas tshwm sim los ntawm lawv qhov kev siv RESORCES.

RPL muab kev tso cai rau cov neeg siv los siv RESOURCES nkaus xwb nrog rau Raspberry Pi cov khoom lag luam. Tag nrho lwm yam kev siv RESOURCES raug txwv. Tsis muaj ntawv tso cai tso cai rau lwm tus RPL lossis lwm tus neeg sab nrauv txoj cai kev txawj ntse.
HIGH RISK ACTIVITITIES. Raspberry Pi cov khoom tsis yog tsim, tsim los yog npaj rau siv nyob rau hauv tej yam kev puas tsuaj uas yuav tsum tsis txhob muaj kev nyab xeeb kev ua tau zoo, xws li nyob rau hauv lub lag luam ntawm nuclear chaw, aircraft navigation los yog kev sib txuas lus systems, huab cua tswj tsheb, riam phom systems los yog kev nyab xeeb-tseem ceeb daim ntaub ntawv (xws li kev pab cuam lub neej. cov tshuab thiab lwm yam khoom siv kho mob), uas qhov tsis ua haujlwm ntawm cov khoom tuaj yeem ua rau ncaj qha mus rau kev tuag, kev raug mob ntawm tus kheej lossis kev puas tsuaj rau lub cev lossis ib puag ncig ("High Risk Activities"). RPL tshwj xeeb tshaj tawm tsis lees paub qhov kev lees paub lossis kev lees paub ntawm kev nyab xeeb rau Kev Nyab Xeeb Kev Nyab Xeeb Kev Nyab Xeeb thiab lees txais tsis muaj kev lav phib xaub rau kev siv lossis suav nrog Raspberry Pi cov khoom lag luam hauv Cov Kev Ua Phem Txhaum Cai.

Raspberry Pi cov khoom raug muab raws li RPL's Standard Terms. RPL qhov kev muab ntawm RASOURCES tsis nthuav lossis hloov pauv RPL's Standard Terms suav nrog tab sis tsis txwv rau qhov tsis lees paub thiab kev lees paub hauv lawv.

Tshooj 1. Kev Taw Qhia

Daim duab 1. KiCad 3D rendering ntawm RP2350A Yam tsawg kawg nkaus tsim example

Thaum peb xub qhia Raspberry Pi RP2040, peb kuj tau tso tawm 'Minimal' tsim example thiab nrog rau cov lus qhia kho vajtse tsim nrog RP2040 uas cia siab tias yuav piav qhia yuav ua li cas RP2040 tuaj yeem siv rau hauv lub rooj tsav xwm yooj yim, thiab vim li cas cov kev xaiv ntau yam tau ua. Nrog rau kev tuaj txog ntawm RP235x series, nws yog lub sijhawm los rov mus saib tus thawj RP2040 Tsawg kawg tsim, thiab hloov kho nws kom suav nrog cov yam ntxwv tshiab, thiab tseem rau txhua lub pob sib txawv; RP2350A nrog nws cov pob QFN-60, thiab RP2350B uas yog QFN-80. Ib zaug ntxiv, cov qauv no yog nyob rau hauv Kicad (7.0) hom ntawv, thiab muaj rau rub tawm (https://datasheets.raspberrypi.com/rp2350/Minimal-KiCAD.zip).

Yam tsawg kawg nkaus Board
Thawj Lub Rooj Tswjhwm Saib Tsawg yog ib qho kev sim muab cov qauv siv yooj yim, siv qhov tsawg kawg nkaus ntawm cov khoom siv sab nraud uas yuav tsum tau khiav ntawm RP2040 thiab tseem muaj tag nrho cov IO nthuav tawm thiab siv tau. Qhov no yog qhov tseem ceeb ntawm lub zog hluav taws xob (5V rau 3.3V linear regulator), siv lead ua oscillator, flash nco, thiab IO txuas (lub qhov (socket) micro USB thiab GPIO headers). Tus tshiab RP235x series Cov laug cam tsawg heev yog qhov zoo ib yam, tab sis nrog qee qhov kev hloov pauv tsim nyog vim yog kho vajtse tshiab. Ntxiv rau qhov no, thiab txawm tias yuav mus me ntsis tawm tsam qhov tsawg kawg nkaus ntawm qhov tsim, Kuv tau ntxiv ob peb lub nyees khawm rau bootsel thiab khiav, ua ke nrog SWD header cais, uas yuav tsum txhais tau hais tias tsis tshua muaj kev ntxhov siab debug kev paub lub sijhawm no nyob ib puag ncig. Cov qauv tsim tsis nruj me ntsis hais lus xav tau cov nyees khawm no, cov teeb liab tseem muaj nyob rau ntawm lub taub hau, thiab lawv tuaj yeem raug tshem tawm yog tias koj tshwj xeeb yog tus nqi lossis qhov chaw nco qab, lossis muaj cov nyiam masochistic.

RP2040 vs RP235x series
Qhov pom tseeb tshaj plaws hloov pauv yog nyob rau hauv cov pob khoom. Whereas RP2040 yog 7x7mm QFN-56, RP235x series tam sim no muaj plaub tus tswv cuab sib txawv. Muaj ob yam khoom siv uas sib koom tib lub pob QFN-60; lub RP2350A uas tsis muaj lub flash cia, thiab RP2354A uas ua. Ib yam li ntawd, QFN-80 kuj tuaj nyob rau hauv ob lub flavors; RP2354B nrog flash, thiab RP2350B tsis muaj. QFN-60 cov khoom siv thiab cov thawj RP2040 sib koom ua ketage.

Lawv txhua tus muaj 30 GPIOs, plaub qhov tseem txuas nrog ADC, thiab yog 7x7mm loj. Txawm li cas los xij, RP2350A tsis yog ib qho kev hloov pauv rau RP2040, vim tias tus naj npawb ntawm pins ntawm txhua qhov sib txawv. Los ntawm qhov sib piv, QFN-80 chips tam sim no muaj 48 GPIOs, thiab yim ntawm cov no tam sim no muaj peev xwm ADC. Vim li no, peb tam sim no muaj ob lub Rooj Tswjhwm Saib Tsawg; Ib qho rau 60 tus pin cov khoom siv, thiab ib qho rau 80. Cov boards Tsawg no feem ntau yog tsim los rau cov khoom uas tsis muaj flash sab hauv (RP2350), tab sis cov qauv tsim tau yooj yim siv nrog cov khoom siv flash sab hauv (RP2354) los ntawm tsuas yog tshem tawm onboard flash. nco, lossis txawm siv nws ua ib qho khoom siv flash thib ob (ntxiv rau qhov no tom qab). Muaj qhov sib txawv me ntsis ntawm ob lub rooj tsavxwm, uas tsis yog qhov tseeb QFN-80 version muaj cov kab ntev ntawm lub taub hau kom haum rau GPIO ntxiv, thiab lub rooj tsavxwm loj dua.

Ib cag ntawm lub pob, qhov loj tshaj pawg thawj coj-theem sib txawv ntawm RP235x series thiab RP2040 yog cov khoom siv hluav taws xob. Lub RP235x series muaj qee lub zog tshiab pins, thiab ib qho kev sib txawv sab hauv. Lub 100mA linear regulator ntawm RP2040 tau raug hloov nrog 200mA hloov regulator, thiab yog li ntawd, nws yuav tsum muaj qee qhov tshwj xeeb circuitry, thiab tsis muaj kev saib xyuas me ntsis nrog cov txheej txheem. Nws raug nquahu kom koj ua raws li peb qhov kev teeb tsa thiab cov txheej txheem xaiv; peb twb dhau los ntawm qhov mob ntawm qhov yuav tsum tau ua ntau zaus ntawm kev tsim, yog li cia siab tias koj tsis tas yuav.

Daim duab 2. KiCad 3D rendering ntawm RP2350B Yam tsawg kawg nkaus tsim example

Tus Tsim
Lub hom phiaj ntawm Minimal tsim examples yog los tsim ib khub ntawm cov laug cam yooj yim siv RP235x series, uas yuav tsum pheej yig thiab yooj yim tsim tau, tsis tas siv cov txheej txheem txawv txawv PCB. Qhov tsawg kawg nkaus boards yog li 2 txheej tsim, siv cov khoom uas yuav tsum muaj feem ntau, thiab tag nrho cov mounted rau sab saum toj ntawm lub rooj tsavxwm. Thaum nws yuav zoo siv cov khoom loj, yooj yim siv tes-kho tau cov khoom, lub suab me me ntawm QFN chips (0.4mm) txhais tau hais tias siv qee qhov 0402 (1005 metric) passive Cheebtsam yog tsis muaj kev zam yog tias tag nrho cov GPIOs yuav tsum tau siv. Thaum tes-solding 0402 Cheebtsam tsis nyuaj heev nrog ib tug zoo soldering hlau, nws yog heev yooj yim mus solder lub QFNs tsis muaj cov khoom tshwj xeeb.

Nyob rau ob peb ntu tom ntej no, kuv yuav sim piav qhia seb qhov txuas ntxiv yog dab tsi rau, thiab cia siab tias peb tuaj yeem xaiv peb li cas. Raws li kuv tab tom yuav tham txog ob qho qauv tsim, ib qho rau txhua pob loj, kuv tau sim ua kom yooj yim li kuv tuaj yeem ua tau. Raws li qhov ua tau, tag nrho cov ntaub ntawv pov thawj rau ob lub rooj tsav xwm zoo ib yam, yog li yog tias kuv xa mus rau U1, R1, thiab lwm yam, ces nws muaj feem cuam tshuam rau ob lub rooj tsavxwm. Qhov tshwj xeeb tshwj xeeb yog thaum cov khoom siv tsuas yog nyob rau ntawm ib qho ntawm cov laug cam (hauv txhua kis, qhov no yuav nyob ntawm qhov loj dua 80 tus pin sib txawv), ces cov khoom hauv nqe lus nug tsuas yog nyob ntawm QFN-80 tsim; rau example, R13 tsuas yog tshwm rau ntawm lub rooj tsavxwm no.

Tshooj 2. Lub hwj chim

Cov khoom siv hluav taws xob ntawm RP235x series thiab RP2040 txawv me ntsis lub sijhawm no nyob ib puag ncig, txawm hais tias hauv nws qhov kev teeb tsa yooj yim tshaj plaws, nws tseem xav tau ob qho khoom siv, 3.3V thiab 1.1V. Lub RP235x series yog ib txhij muaj zog dua tshaib plab, vim nws muaj kev ua tau zoo dua, thiab tseem siv tau ntau dua (thaum nyob hauv lub xeev tsis muaj zog) dua li nws ua ntej, thiab yog li cov kab hluav taws xob ntawm RP2040 tau hloov kho dua tshiab nrog kev hloov pauv. Qhov no tso cai rau peb ua haujlwm tau zoo dua ntawm cov hluav taws xob siab dua (txog 200mA piv rau 100mA yav dhau los).

New on-chip voltagib regulator

Daim duab 3. Schematic seem uas qhia lub internal regulator circuit

Lub linear regulator ntawm RP2040 muaj ob tus pins, 3.3V input, thiab 1.1V tso zis los muab cov DVDD ntawm lub nti. Lub sijhawm no, tus tswj hwm ntawm RP235x series muaj tsib tus pins, thiab yuav tsum muaj qee yam khoom siv sab nraud kom nws ua haujlwm. Txawm hais tias qhov no zoo li me ntsis ntawm cov kauj ruam rov qab los ntawm kev siv tau, tus tswj kev hloov pauv muaj lub advantage ntawm kev ua kom muaj zog ntau dua ntawm cov khoom siv hluav taws xob ntau dua.

Raws li lub npe qhia, tus regulator sai hloov mus rau hauv thiab tawm ib qho transistor sab hauv txuas rau 3.3V input vol.tage (VREG_VIN) mus rau VREG_LX tus pin, thiab nrog kev pab los ntawm ib qho inductor (L1) thiab cov zis capacitor (C7), nws tuaj yeem tsim DC tso zis vol.tage uas tau nqis los ntawm kev tawm tswv yim. Tus VREG_FB tus pin saib xyuas cov zis voltage, thiab kho qhov sib piv ntawm / tawm ntawm lub voj voog hloov, kom ntseeg tau tias qhov xav tau voltage yog khaws cia. Raws li cov tam sim no loj hloov los ntawm VREG_VIN rau VREG_LX, ib tug loj capacitor (C6) ze rau cov tswv yim yuav tsum tau, yog li peb tsis txhob chim rau 3.3V mov ntau dhau. Hais txog cov kev hloov pauv loj no, tus tswj hwm kuj tuaj nrog nws tus kheej hauv av rov qab txuas, VREG_PGND. Ib yam li VREG_VIN thiab VREG_LX, qhov kev teeb tsa ntawm qhov kev sib txuas no yog qhov tseem ceeb, thiab thaum VREG_PGND yuav tsum txuas mus rau lub ntsiab GND, nws yuav tsum ua raws li txoj hauv kev uas tag nrho cov hloov pauv loj tam sim no rov qab ncaj qha rau PGND tus pin, tsis muaj kev cuam tshuam rau lwm tus. GND ntau dhau lawm.

Tus pin kawg yog VREG_AVDD, uas muab cov analogue circuitry nyob rau hauv lub regulator, thiab qhov no rhiab heev rau lub suab nrov.

Daim duab 4. Schematic seem uas qhia txog PCB layout ntawm lub regulator

Qhov kev teeb tsa ntawm tus tswj hwm ntawm cov laug cam tsawg ze ze tsom iav ntawm Raspberry Pi Pico 2. Kev ua haujlwm zoo heev tau mus rau hauv kev tsim ntawm lub voj voog no, nrog ntau qhov kev hloov pauv ntawm PCB yuav tsum tau ua kom nws zoo li peb muaj peev xwm. ua tau. Thaum koj tuaj yeem tso cov khoom no rau ntau txoj hauv kev sib txawv thiab tseem tau txais tus tswj hwm rau 'ua haujlwm' (piv txwv li, tsim cov khoom tsim tawm.tage nyob rau theem zoo, zoo txaus kom tau txais nws txoj cai khiav), peb tau pom tias peb tus neeg tswj hwm yuav tsum tau kho raws nraim txoj hauv kev kom nws zoo siab, thiab zoo siab, Kuv txhais tau tias tsim cov khoom tso tawm kom raug.tage nyob rau hauv ib tug ntau yam ntawm load tam sim no tej yam kev mob.
Thaum ua peb qhov kev sim ntawm qhov no, peb tau poob siab me ntsis kom nco ntsoov tias lub ntiaj teb tsis yooj yim ntawm physics tsis tuaj yeem tsis quav ntsej txhua lub sijhawm. Peb, raws li engineers, feem ntau sim thiab ua raws nraim qhov no; simplifying Cheebtsam, tsis quav ntsej (feem ntau) insignificant lub cev muaj zog, thiab es tsis txhob tsom rau cov khoom uas peb xav nyob rau hauv. Rau example, ib tug yooj yim resistor tsis yog tsuas yog muaj ib tug kuj, tab sis kuj inductance, thiab lwm yam. Nyob rau hauv peb cov ntaub ntawv, peb (re) nrhiav tau hais tias inductors muaj ib tug sib nqus teb nrog rau lawv, thiab qhov tseem ceeb, radiates nyob rau hauv ib tug kev taw qhia nyob ntawm seb txoj kev ntawm lub kauj. yog qhov txhab, thiab cov kev taw qhia ntawm qhov ntws ntawm qhov tam sim no. Peb kuj tau ceeb toom tias 'tag nrho' tiv thaiv inductor tsis txhais li cas koj xav tias nws yuav. Lub magnetic teb yog attenuated mus rau ib tug loj npaum li cas, tab sis ib txhia tseem khiav. Peb pom tias cov regulator kev ua tau zoo tuaj yeem txhim kho loj heev yog tias tus inductor yog 'txoj kev mus ncig'.
Nws hloov tawm hais tias lub magnetic teb emitting los ntawm ib tug 'txoj kev tsis ncaj ncees lawm puag ncig' inductor cuam tshuam nrog lub regulator output capacitor (C7), uas nyob rau hauv lem upsets tswj circuitry nyob rau hauv RP2350. Nrog cov inductor nyob rau hauv qhov kev taw qhia kom zoo, thiab cov txheej txheem meej thiab cov khoom siv xaiv siv ntawm no, ces qhov teeb meem no ploj mus. Yuav tsis muaj qhov xav tsis thoob yuav muaj lwm qhov kev teeb tsa, cov khoom siv, thiab lwm yam, uas tuaj yeem ua haujlwm nrog inductor hauv txhua qhov kev taw qhia, tab sis lawv yuav siv ntau qhov chaw PCB kom ua tau li ntawd. Peb tau muab qhov kev pom zoo no los cawm tib neeg ntau lub sijhawm engineering uas peb tau siv los txhim kho thiab kho qhov kev cog lus thiab coj tus cwj pwm zoo.
Ntxiv mus, peb tab tom mus kom deb li deb hais tias yog tias koj xaiv tsis siv peb tus example, ces koj ua li ntawd ntawm koj tus kheej txaus ntshai. Ntau yam zoo li peb twb tau ua nrog RP2040 thiab cov siv lead ua hluav taws xob, qhov twg peb hais (zoo, xav kom) koj siv ib feem (peb yuav ua li ntawd dua hauv cov khoom siv lead ua ntawm cov ntaub ntawv no).
Lub directionality ntawm cov me me inductors yog zoo nkauj npaum li universally ignored, nrog rau orientation ntawm lub kauj winding tsis yooj yim sua kom deduce, thiab randomly faib raws ib tug reel ntawm cov khoom. Cov ntaub ntawv loj dua inductor feem ntau tuaj yeem pom muaj cov cim polarity ntawm lawv, txawm li cas los xij peb tuaj yeem pom tsis muaj qhov tsim nyog hauv 0806 (2016 metric) rooj plaub loj uas peb tau xaiv. Txog rau qhov kawg no, peb tau ua haujlwm nrog Abracon los tsim ib feem 3.3μH nrog cov ntsiab lus los qhia qhov polarity, thiab qhov tseem ceeb, tuaj rau ntawm ib lub reel nrog lawv txhua tus ua tib yam. Lub TBD yog (los yog yuav luv luv) yuav muaj rau pej xeem sawv daws los ntawm distributers. Raws li tau hais ua ntej, VREG_AVDD cov khoom siv yog qhov muaj suab nrov heev, thiab yog li yuav tsum tau lim. Peb pom tias raws li VREG_AVDD tsuas yog kos ib ncig ntawm 200μA, RC lim ntawm 33Ω thiab 4.7μF txaus.
Yog li, txhawm rau txheeb xyuas, cov khoom siv yuav yog ...
- C6, C7 & C9 - 4.7μF (0402, 1005 metric)
- L1 - Abracon TBD (0806, 2016 metric)
- R3 - 33Ω (0402, 1005 metric)
Cov ntaub ntawv RP2350 muaj kev sib tham ntxaws ntxiv ntawm cov lus pom zoo ntawm tus tswj hwm kev teeb tsa, thov saib Cov Khoom Sab Nraud thiab PCB layout cov cai.

Cov tswv yim khoom

Lub zog hluav taws xob sib txuas rau qhov tsim no yog los ntawm 5V VBUS tus pin ntawm Micro-USB connector (labeled J1 hauv daim duab 5). Qhov no yog ib txoj hauv kev siv hluav taws xob siv hluav taws xob, thiab nws ua rau kev nkag siab ntawm no, vim RP2350 muaj USB ua haujlwm, uas peb yuav txuas rau cov ntaub ntawv pins ntawm qhov txuas no. Raws li peb xav tau tsuas yog 3.3V rau qhov tsim no (cov khoom siv 1.1V los ntawm sab hauv), peb yuav tsum txo qis cov khoom siv 5V USB, qhov no, siv lwm qhov, sab nraud vol.tage regulator, nyob rau hauv cov ntaub ntawv no ib tug linear regulator (aka Low Drop Out regulator, los yog LDO). Yav dhau los extolled lub tsim txiaj ntawm kev siv ib tug npaum switching regulator, nws kuj yog ib qho kev xaiv ntse siv ib tug ntawm no thiab, tab sis kuv twb opted rau simplicity. Ua ntej, siv LDO yuav luag txhua zaus yooj yim dua. Tsis muaj kev suav yuav tsum tau txiav txim siab seb qhov inductor loj npaum li cas koj yuav tsum siv, lossis loj npaum li cas cov zis capacitors, thiab cov txheej txheem feem ntau yog ntau ncaj qha thiab. Qhov thib ob, kev txuag txhua lub zog kawg ntawm lub zog tsis yog lub hom phiaj ntawm no; Yog hais tias nws yog, kuv xav tiag tiag siv ib tug switching regulator, thiab koj yuav nrhiav tau ib tug example ntawm kev ua li ntawd ntawm Raspberry Pi Pico 2. Thiab qhov thib peb, Kuv tuaj yeem yooj yim 'qiv' lub voj voog uas kuv tau siv yav dhau los ntawm RP2040 version ntawm Lub Rooj Tswjhwm Saib Tsawg. NCP1117 (U2) xaiv ntawm no muaj qhov tso zis ruaj khov ntawm 3.3V, muaj dav dav, thiab tuaj yeem muab tau txog li 1A ntawm tam sim no, uas yuav muaj ntau rau ntau tus qauv tsim. Saib ntawm daim ntawv teev cov ntaub ntawv rau NCP1117 qhia peb tias cov cuab yeej no yuav tsum muaj 10μF capacitor ntawm lub tswv yim, thiab lwm qhov ntawm cov zis (C1 thiab C5).

Decoupling capacitor

Daim duab 6. Schematic seem uas qhia txog RP2350 fais fab mov inputs, voltage regulator thiab decoupling capacitors

Lwm qhov ntawm cov qauv tsim hluav taws xob yog cov decoupling capacitors xav tau rau RP2350. Cov no muab ob txoj haujlwm yooj yim. Ua ntej, lawv lim tawm cov suab nrov ntawm lub zog, thiab qhov thib ob, muab cov khoom siv hauv zos ntawm cov nqi uas cov circuits hauv RP2350 tuaj yeem siv tau ntawm kev ceeb toom luv luv. Qhov no tiv thaiv voltage theem nyob rau hauv ib puag ncig tam sim los ntawm kev poob qis heev thaum qhov kev thov tam sim no dheev nce. Vim li no, nws yog ib qho tseem ceeb uas yuav tsum tau muab cov khoom sib txuas ze rau lub hwj chim pins. Ordinarily, peb pom zoo kom siv 100nF capacitor ib lub hwj chim tus pin, txawm li cas los xij, peb deviate los ntawm txoj cai no nyob rau hauv ob peb zaus.

Daim duab 7. Ntu ntawm layout qhia RP2350 routing thiab decoupling

Ua ntej, txhawm rau kom muaj peev xwm muaj qhov chaw txaus rau tag nrho cov chip pins tuaj yeem raug tshem tawm, nyob deb ntawm lub cuab yeej, peb yuav tsum muaj kev cuam tshuam nrog tus nqi decoupling capacitors peb tuaj yeem siv. Hauv qhov tsim no, pins 53 thiab 54 ntawm RP2350A (pins 68 thiab 69 ntawm RP2350B) sib koom ib lub capacitor (C12 hauv daim duab 7 thiab daim duab 6), vim tias tsis muaj ntau chav nyob rau sab ntawm lub cuab yeej, thiab cov khoom siv. thiab layout ntawm tus regulator coj ua ntej.
Qhov tsis muaj qhov chaw no tuaj yeem kov yeej me ntsis yog tias peb siv cov cuab yeej siv ntau dua / kim, xws li cov khoom me me, lossis plaub txheej PCB nrog cov khoom ntawm ob sab saum toj thiab hauv qab. Qhov no yog qhov tsim kev sib pauv; peb tau txo qhov nyuaj thiab tus nqi, ntawm tus nqi ntawm qhov muaj tsawg decoupling capacitance, thiab capacitors uas yog me ntsis deb ntawm lub nti tshaj qhov zoo tshaj plaws (qhov no nce qhov inductance). Qhov no tuaj yeem muaj cov txiaj ntsig ntawm kev txwv qhov siab tshaj plaws uas tus qauv tsim tuaj yeem ua haujlwm ntawm, raws li voltage mov tuaj yeem ua suab nrov heev thiab poob qis dua qhov tsawg kawg nkaus tso cai voltage; tab sis rau ntau daim ntawv thov, qhov kev sib pauv no yuav tsum tau txais.

Lwm qhov kev sib txawv ntawm txoj cai 100nF yog li peb tuaj yeem txhim kho qhov voltage regulator kev ua tau zoo; peb pom zoo kom siv 4.7μF rau C10, uas yog muab tso rau sab nraud ntawm lub nti los ntawm tus tswj hwm.

Tshooj 3. Flash Nco

Thawj flash

Daim duab 8. Schematic seem uas qhia cov thawj flash nco thiab USB_BOOT circuitry

Yuav kom khaws tau qhov program code uas RP2350 tuaj yeem khau raj thiab khiav los ntawm, peb yuav tsum siv lub cim xeeb flash, tshwj xeeb, quad SPI flash nco. Cov cuab yeej xaiv ntawm no yog W25Q128JVS ntaus ntawv (U3 hauv daim duab 8), uas yog 128Mbit nti (16MB). Qhov no yog lub cim xeeb loj tshaj plaws uas RP2350 tuaj yeem txhawb nqa. Yog tias koj daim ntawv thov tshwj xeeb tsis xav tau ntau npaum li kev khaws cia, ces lub cim xeeb me me, pheej yig dua tuaj yeem siv los hloov.
Raws li cov databus no tuaj yeem ua tau ntau zaus thiab siv tsis tu ncua, QSPI pins ntawm RP2350 yuav tsum tau xa ncaj qha mus rau lub teeb, siv cov kev sib txuas luv luv los tswj cov teeb liab kev ncaj ncees, thiab tseem txo qis kev sib tham hauv ib puag ncig circuits. Crosstalk yog qhov chaw teeb liab ntawm ib lub voj voog hluav taws xob tuaj yeem ua rau tsis xav tau voltages ntawm ib qho chaw nyob sib ze, muaj peev xwm ua rau muaj teeb meem tshwm sim.

QSPI_SS teeb liab yog qhov tshwj xeeb. Nws txuas nrog lub flash ncaj qha, tab sis nws kuj muaj ob lub resistors (zoo, plaub, tab sis kuv mam li tuaj rau qhov ntawd tom qab) txuas rau nws. Thawj (R1) yog rub-up mus rau 3.3V mov. Lub cim xeeb flash xav kom cov nti-xaiv cov tswv yim kom nyob rau tib lub voltage raws li nws tus kheej 3.3V mov tus pin raws li lub cuab yeej siv zog, txwv tsis pub, nws tsis ua haujlwm kom raug. Thaum lub RP2350 yog powered up, nws QSPI_SS tus pin yuav cia li default rau ib tug rub-up, tab sis muaj ib tug luv luv lub sij hawm ntawm lub sij hawm hloov-on qhov twg lub xeev ntawm tus QSPI_SS tus pin tsis tuaj yeem lav. Qhov sib ntxiv ntawm lub rub-up resistor ua kom ntseeg tau tias qhov kev xav tau no yuav txaus siab ib txwm. R1 yog cim raws li DNF (Tsis Haum) ntawm lub schematic, raws li peb tau pom tias nrog cov khoom siv flash tshwj xeeb no, kev rub tawm sab nraud yog qhov tsis tsim nyog. Txawm li cas los xij, yog tias siv lub teeb sib txawv, nws yuav dhau los ua qhov tseem ceeb uas yuav tsum tau ntxig 10kΩ resistor ntawm no, yog li nws tau suav nrog hauv rooj plaub xwb.
Qhov thib ob resistor (R6) yog 1kΩ resistor, txuas nrog lub laub khawm (SW1) sau tias 'USB_BOOT'. Qhov no yog vim QSPI_SS tus pin siv los ua 'khau raj pluaj'; RP2350 kuaj xyuas tus nqi ntawm qhov I / O no thaum lub caij khau raj, thiab yog tias nws pom tias yog qhov laj thawj 0, ces RP2350 rov qab mus rau BOOTSEL hom, qhov twg RP2350 nthuav tawm nws tus kheej li USB loj cia khoom, thiab cov lej tuaj yeem luam tawm ncaj qha. rau nws. Yog tias peb tsuas yog nias lub pob, peb rub QSPI_SS tus pin rau hauv av, thiab yog tias lub cuab yeej rov pib dua (xws li los ntawm toggling RUN tus pin), RP2350 yuav rov pib dua hauv BOOTSEL hom es tsis txhob sim khiav cov ntsiab lus ntawm lub flash. Cov resistors no, R2 thiab R6 (R9 thiab R10 kuj), yuav tsum tau muab tso rau ze ntawm lub flash nti, yog li peb tsis txhob ncua ntev ntawm tooj liab lem uas yuav cuam tshuam rau lub teeb liab.
Tag nrho cov saum toj no tshwj xeeb yog siv rau RP2350, uas tsis muaj flash sab hauv. Tau kawg, RP2354 cov khoom siv muaj 2MB flash nco, yog li tsis tas yuav tsum muaj U3 lub cim xeeb sab nraud, yog li U3 tuaj yeem raug tshem tawm ntawm schematic, lossis tsuas yog sab laug tsis muaj neeg nyob. Hauv ob qho xwm txheej no, peb tseem xav khaws USB_BOOT hloov txuas nrog QSPI_SS, kom peb tseem tuaj yeem nkag mus rau USB hom khau raj.

Secondary flash los yog PSRAM

RP235x series tam sim no txhawb nqa lub cim xeeb thib ob siv tib QSPI pins, nrog GPIO muab cov nti ntxiv xaiv. Yog li, yog tias peb tab tom siv RP2354 (uas muaj flash sab hauv), ces peb tuaj yeem siv U3 ua lub teeb nyem thib ob, lossis txawm hloov nws nrog PSRAM ntaus ntawv. Txhawm rau ua qhov no, peb yuav tsum txiav QSPI_SS los ntawm U3, thiab hloov nws mus rau qhov tsim nyog GPIO hloov. Qhov ze tshaj plaws GPIO muaj peev xwm ua tus nti xaiv (XIP_CS1n) yog GPIO0, yog li los ntawm kev tshem tawm 0Ω ntawm R10, thiab haum rau R9, tam sim no peb tuaj yeem nkag mus rau U3 ntxiv rau ntawm lub teeb nyem. Txhawm rau kom ua tiav advantage ntawm cov yam ntxwv no, qhov twg peb muaj ob lub cim xeeb sab nraud kom lub flash-tsawg RP2350 qhov chaw tuaj yeem tau txais txiaj ntsig, qhov loj dua ntawm ob lub Rooj Tswjhwm Saib Tsawg, rau RP2350B, suav nrog kev xaiv hneev taw (U4) rau ib qho ntxiv nco nti.

Daim duab 9. Schematic seem uas qhia txog kev xaiv lwm lub cim xeeb ntaus ntawv

Yuav kom siv tau cov cuab yeej no, nws yuav pom tseeb tias yuav tsum muaj neeg nyob, nrog rau R11 (0Ω), thiab R13 (10KΩ). Qhov sib ntxiv ntawm R11 txuas GPIO0 (XIP_CS1n teeb liab) rau lub nti xaiv ntawm lub cim xeeb thib ob. Lub rub-up ntawm lub nti xaiv tus pin yog qhov xav tau lub sijhawm no, vim tias lub xeev qub ntawm GPIO0 yuav tsum tau rub qis ntawm lub zog-up, uas yuav ua rau peb lub flash ntaus ntawv ua tsis tiav. C22 kuj tseem yuav xav tau los muab cov khoom siv hluav taws xob hauv zos rau U4.

Txhawb flash chips
Thawj qhov flash sojntsuam ib ntus, siv hauv qab kom rho tawm qhov thib ob stage los ntawm flash, siv 03h serial nyeem cov lus txib, nrog 24-ntsis chaw nyob, thiab serial moos ntawm kwv yees li 1MHz. Nws rov ua dua los ntawm plaub qhov kev sib txuas ntawm lub moos polarity thiab moos moos, tab tom nrhiav rau qhov siv tau thib ob.tage CRC32 checksum.
Raws li qhov thib ob stage yog pub dawb rau kev teeb tsa ua tiav-hauv-chaw siv tib yam 03h serial nyeem cov lus txib, RP2350 tuaj yeem ua cached flash ua-hauv-qhov chaw nrog cov nti txhawb nqa 03h serial nyeem nrog 24-ntsis chaw nyob, uas suav nrog feem ntau 25-series flash devices . SDK muab ib qho piv txwvample ob stage rau CPOL=0 CPHA=0, at https://github.com/raspberrypi/pico-sdk/blob/master/src/rp2350/boot_stage2/boot2_generic_03h.S. Txhawm rau txhawb flash programming siv cov txheej txheem hauv qab, lub cuab yeej yuav tsum tau teb rau cov lus txib hauv qab no:

02h 256-byte nplooj ntawv program
05h xwm txheej sau npe nyeem
06h teeb sau pab latch

20h 4kB sector lwv

RP2350 kuj txhawb ntau hom kev siv dual-SPI thiab QSPI. Rau example, https://github.com/raspberrypi/pico-sdk/blob/master/src/rp2350/boot_stage2/boot2_w25q080.S configures Winbond W25Q-series ntaus ntawv rau quad-IO txuas ntxiv nyeem hom, qhov twg RP2350 xa quad-IO chaw nyob (tsis muaj cov lus hais ua ntej) thiab lub flash teb nrog quad-IO cov ntaub ntawv.

Qee qhov kev ceeb toom yog xav tau nrog flash XIP hom qhov twg lub flash ntaus ntawv tsis teb rau cov qauv serial commands, zoo li Winbond txuas ntxiv nyeem hom hais saum toj no. Qhov no tuaj yeem ua rau muaj teeb meem thaum RP2350 rov pib dua, tab sis cov khoom siv flash tsis yog lub zog-cycled, vim tias lub flash yuav tsis teb rau bootrom lub flash sojntsuam ib ntus. Ua ntej tshaj tawm 03h serial nyeem, lub bootrom ib txwm teeb tsa cov kab ke ruaj khov hauv qab no, uas yog qhov ua kom zoo tshaj plaws rau kev txiav XIP ntawm ntau yam khoom siv flash:

CSn=1, IO[3:0]=4'b0000 (ntawm rub downs kom tsis txhob muaj kev sib cav), qhov teeb meem × 32 moos
CSn=0, IO[3:0]=4'b1111 (ntawm rub ups kom tsis txhob muaj kev sib cav), qhov teeb meem × 32 moos
CSn=1

CSn=0, MOSI=1'b1 (tsav low-Z, tag nrho lwm yam I/Os Hi-Z), teeb meem × 16 moos

Yog tias koj lub cuab yeej xaiv tsis teb rau qhov ntu no thaum nyob rau hauv nws txoj kev nyeem tas li, ces nws yuav tsum tau khaws cia rau hauv lub xeev uas txhua qhov kev hloov pauv tau ua ntej los ntawm cov lus txib serial, txwv tsis pub RP2350 yuav tsis tuaj yeem rov qab los tom qab rov pib dua.
Yog xav paub ntxiv txog QSPI, thov saib QSPI Memory Interface (QMI) hauv RP2350 datasheet.

Tshooj 4. Crystal Oscillator

Daim duab 10. Schematic seem qhia cov siv lead ua oscillator thiab load capacitors

Hais lus nruj me ntsis, RP2350 tsis xav tau lub moos sab nraud, vim nws muaj nws tus kheej oscillator sab hauv. Txawm li cas los xij, raws li qhov zaus ntawm cov oscillator sab hauv no tsis zoo txhais lossis tswj tau, sib txawv ntawm nti mus rau nti, nrog rau cov khoom sib txawvtages thiab kub, nws raug nquahu kom siv qhov chaw ruaj khov sab nraud. Cov ntawv thov uas tso siab rau cov zaus zaus tsis tuaj yeem ua tsis tau yam tsis muaj lwm qhov zaus, USB ua tus thawj example.
Kev muab cov khoom siv sab nraud tuaj yeem ua tau nyob rau hauv ib qho ntawm ob txoj hauv kev: los ntawm kev muab lub moos nrog CMOS tso zis (square yoj ntawm IOVDD vol.tage) rau hauv XIN tus pin, lossis los ntawm kev siv 12MHz siv lead ua txuas ntawm
XIN and XOUT. Siv cov siv lead ua yog qhov kev xaiv zoo tshaj plaws ntawm no, vim tias lawv yog ob qho tib si pheej yig thiab raug heev.

Cov siv lead ua xaiv rau qhov tsim no yog ABM8-272-T3 (Y1 hauv daim duab 10). Qhov no yog tib yam 12MHz siv lead ua siv rau ntawm Raspberry Pi Pico thiab Raspberry Pi Pico 2. Peb pom zoo kom siv cov siv lead ua no nrog rau cov khoom siv hluav taws xob los xyuas kom meej tias lub moos pib sai sai nyob rau hauv txhua yam tsis muaj kev puas tsuaj rau cov siv lead ua nws tus kheej. Crystal muaj 30ppm zaus kam rau ua, uas yuav tsum zoo txaus rau feem ntau daim ntawv thov. Nrog rau qhov ua siab ntev ntawm +/- 30ppm, nws muaj qhov siab tshaj plaws ESR ntawm 50Ω, thiab lub peev xwm thauj khoom ntawm 10pF, ob qho tib si muaj cov kabmob ntawm kev xaiv ntawm cov khoom sib txuas.
Rau cov siv lead ua kom oscillate ntawm qhov xav tau ntau zaus, cov chaw tsim khoom qhia txog lub peev xwm thauj khoom uas nws xav tau rau nws ua li ntawd, thiab qhov no, nws yog 10pF. Qhov no load capacitance yog ua tiav los ntawm kev tso ob lub capacitors ntawm tus nqi sib npaug, ib qho ntawm txhua sab ntawm cov siv lead ua rau hauv av (C3 thiab C4). Los ntawm crystal lub point ntawm view, cov capacitors txuas nrog hauv cov koob ntawm nws ob lub terminals. Txoj kev xav hauv Circuit Court qhia peb tias lawv sib xyaw ua ke kom muab lub peev xwm ntawm (C3 * C4) / (C3 + C4), thiab raws li C3 = C4, ces nws tsuas yog C3 / 2. Hauv no example, peb tau siv 15pF capacitors, yog li kev sib xyaw ua ke yog 7.5pF. Ntxiv rau qhov no txhob txwm tshaj tawm lub peev xwm, peb yuav tsum tau ntxiv tus nqi rau qhov tsis txhob txwm ua kom muaj peev xwm ntxiv, lossis cov kab mob cab, uas peb tau txais los ntawm PCB lem thiab XIN thiab XOUT pins ntawm RP2350. Peb mam li xav tias tus nqi ntawm 3pF rau qhov no, thiab raws li qhov no capacitance yog nyob rau hauv parallel rau C3 thiab C4, peb tsuas ntxiv qhov no muab peb tag nrho load capacitance ntawm 10.5pF, uas yog ze txaus rau lub hom phiaj ntawm 10pF. Raws li koj tuaj yeem pom, tus kab mob parasitic capacitance ntawm PCB kab yog qhov tseem ceeb, thiab peb yog li yuav tsum tau ua kom lawv me me kom peb tsis txhob chim siab rau cov siv lead ua thiab nres nws oscillating raws li npaj. Sim thiab ua kom lub layout luv li sai tau.
Qhov thib ob kev txiav txim siab yog qhov siab tshaj plaws ESR (sib npaug series tsis kam) ntawm cov siv lead ua. Peb tau xaiv ib lub cuab yeej nrog qhov siab tshaj plaws ntawm 50Ω, raws li peb tau pom tias qhov no, nrog rau 1kΩ series resistor (R2), yog ib qho txiaj ntsig zoo los tiv thaiv cov siv lead ua dhau-tsav thiab puas thaum siv IOVDD. qib 3.3v. Txawm li cas los xij, yog tias IOVDD tsawg dua 3.3V, ces tus tsav tam sim no ntawm XIN / XOUT pins raug txo, thiab koj yuav pom tias amplitude ntawm cov siv lead ua yog qis dua, los yog tej zaum yuav tsis oscillate txhua. Nyob rau hauv cov ntaub ntawv no, ib tug me me nqi ntawm lub series resistor yuav tsum tau siv. Ib qho kev sib txawv ntawm cov siv lead ua hluav taws xob qhia ntawm no, lossis nrog qib IOVDD uas tsis yog 3.3V, yuav xav tau kev sim ntau los xyuas kom meej tias cov siv lead ua oscillates nyob rau hauv tag nrho cov xwm txheej, thiab pib ua kom txaus txaus kom tsis txhob muaj teeb meem nrog koj daim ntawv thov.

Pom zoo siv lead ua

Rau thawj cov qauv siv RP2350 peb pom zoo kom siv Abrcon ABM8-272-T3. Rau example, ntxiv rau qhov tsawg kawg nkaus tsim example, saib Pico 2 board schematic hauv Appendix B ntawm Raspberry Pi Pico 2 Datasheet thiab Pico 2 tsim files.
Rau qhov kev ua tau zoo tshaj plaws thiab kev ruaj ntseg thoob plaws qhov kev khiav hauj lwm qhov kub thiab txias, siv Abracon ABM8-272-T3. Koj tuaj yeem muab ABM8-272-T3 ncaj qha los ntawm Abracon lossis los ntawm tus neeg muag khoom tso cai. Pico 2 tau raug kho tshwj xeeb rau ABM8-272-T3, uas muaj cov lus qhia hauv qab no:

Txawm hais tias koj siv cov khoom siv lead ua nrog cov lus qhia zoo sib xws, koj yuav tsum tau sim lub voj voog ntawm qhov kub thiab txias kom ruaj khov.
Crystal oscillator yog siv los ntawm IOVDD voltage. Yog li ntawd, Abracon Crystal thiab qhov tshwj xeeb damping resistor yog tuned rau 3.3V ua haujlwm. Yog tias koj siv qhov sib txawv IO voltage, koj yuav tsum rov kho dua.
Ib qho kev hloov pauv rau cov khoom siv lead ua muaj kev pheej hmoo tsis ruaj khov nyob thoob plaws txhua qhov txuas nrog rau lub voj voog siv lead ua.

Yog tias koj tsis tuaj yeem muab cov lus pom zoo siv lead ua ncaj qha los ntawm Abracon lossis tus muag khoom, hu rau applications@raspberrypi.com.

Tshooj 5. IOs

USB
Daim duab 11. Schematic seem uas qhia txog USB pins ntawm RP2350 thiab series termination

Lub RP2350 muab ob lub pins siv rau kev ceev nrawm (FS) lossis qis qis (LS) USB, xws li tus tswv tsev lossis cov cuab yeej siv, nyob ntawm seb cov software siv. Raws li peb twb tau tham lawm, RP2350 tseem tuaj yeem khau raj raws li USB loj cia khoom, yog li txuas cov pins rau USB txuas (J1 hauv daim duab 5) ua rau kev nkag siab. USB_DP thiab USB_DM pins ntawm RP2350 tsis tas yuav muaj kev rub tawm lossis rub-downs ntxiv (yuav tsum tau qhia nrawm, FS lossis LS, lossis seb nws yog tus tswv tsev lossis khoom siv), vim tias cov no tau tsim rau hauv I/Os. Txawm li cas los xij, cov I/Os no yuav tsum tau 27Ω series termination resistors (R7 thiab R8 hauv daim duab 11), muab tso rau ze ntawm lub nti, thiaj li ua tau raws li USB impedance specification.
Txawm hais tias RP2350 tsuas yog txwv rau cov ntaub ntawv ceev ceev (12Mbps), peb yuav tsum sim thiab ua kom paub tseeb tias cov yam ntxwv impedance ntawm cov kab sib kis (cov kab tooj liab txuas cov nti mus rau lub connector) nyob ze rau ntawm
USB specification ntawm 90Ω ( ntsuas qhov sib txawv). Ntawm 1 hli tuab board xws li qhov no, yog tias peb siv 0.8mm dav lem ntawm USB_DP thiab USB_DM, nrog rau qhov sib txawv ntawm 0.15mm ntawm lawv, peb yuav tsum tau txais cov yam ntxwv txawv impedance ntawm ib ncig ntawm 90Ω. Qhov no yog los xyuas kom meej tias cov teeb liab tuaj yeem taug kev raws cov kab sib kis no kom huv li sai tau, txo qis voltage reflections uas tuaj yeem txo qhov kev ncaj ncees ntawm lub teeb liab. Txhawm rau kom cov kab sib kis no ua haujlwm tau zoo, peb yuav tsum xyuas kom meej tias ncaj qha hauv qab cov kab no yog hauv av. Ib qho khoom, tsis muaj kev cuam tshuam thaj tsam ntawm av tooj liab, ncab tag nrho qhov ntev ntawm txoj kev. Ntawm qhov kev tsim no, yuav luag tag nrho cov txheej hauv qab tooj liab tau mob siab rau hauv av, thiab kev saib xyuas tshwj xeeb tau ua kom ntseeg tau tias USB lem hla tsis muaj dab tsi tab sis hauv av. Yog tias PCB tuab dua 1 hli raug xaiv rau koj tsim, ces peb muaj ob txoj kev xaiv. Peb tuaj yeem rov tsim kho cov kab txuas USB los them nyiaj rau qhov kev ncua deb ntawm txoj kab thiab hauv av hauv qab (uas tuaj yeem yog lub cev tsis tuaj yeem), lossis peb tuaj yeem tsis quav ntsej nws, thiab cia siab rau qhov zoo tshaj plaws. USB FS tuaj yeem zam txim ntau, tab sis koj qhov kev ncua deb yuav txawv. Nws zoo li yuav ua haujlwm hauv ntau daim ntawv thov, tab sis tej zaum nws yuav tsis ua raws li USB tus qauv.

I/O headers

Daim duab 12. Schematic seem uas qhia txog 2.54mm I/O headers ntawm QFN60 version

Ntxiv nrog rau USB connector twb tau hais lawm, muaj ob kab ntawm ob kab 2.54mm headers (J2 thiab J3 hauv daim duab 12), ib qho ntawm txhua sab ntawm lub rooj tsavxwm, uas cov seem ntawm I / O tau txuas nrog. Muaj 30 GPIO ntawm RP2350A, whereas muaj 48 GPIO ntawm RP2350B, yog li cov headers ntawm no version ntawm Minimal board yog loj dua los tso cai rau cov pins ntxiv (saib daim duab 13).
Raws li qhov no yog qhov tsim qauv dav dav, tsis muaj daim ntawv thov tshwj xeeb hauv siab, I / O tau ua kom muaj kev sib txuas raws li tus neeg siv xav tau. Cov kab sab hauv ntawm cov pins ntawm txhua lub taub hau yog I / Os, thiab cov kab sab nrauv yog txuas nrog hauv av. Nws yog ib qho kev xyaum zoo kom suav nrog ntau qhov chaw ntawm I / O connectors. Qhov no yuav pab tswj kom muaj lub impedance hauv av qis, thiab tseem yuav muab ntau txoj hauv kev rov qab los rau cov dej ntws mus rau thiab los ntawm qhov chaw.
I/O kev sib txuas. Qhov no yog ib qho tseem ceeb kom txo tau qhov kev cuam tshuam ntawm electro-magnetic cuam tshuam uas tuaj yeem tshwm sim los ntawm qhov rov qab tam sim no ntawm kev hloov pauv sai sai uas siv sij hawm ntev, voj voog txoj hauv kev kom tiav lub voj voog.

Ob lub taub hau yog nyob rau tib daim phiaj 2.54mm, uas ua rau txuas lub rooj tsavxwm no rau lwm yam, xws li breadboards, yooj yim dua. Tej zaum koj yuav xav xav txog qhov haum tsuas yog ib kab header es tsis txhob ntawm ob kab header, dispensing nrog cov kab sab nrauv ntawm kev sib txuas hauv av, kom nws yooj yim dua kom haum rau lub breadboard.

Daim duab 13. Schematic seem uas qhia txog 2.54mm I/O headers ntawm QFN80 version

Debug connector

Daim duab 14. Schematic seem qhia qhov xaiv tau JST connector rau SWD debug

Rau on-chip debugging, koj tuaj yeem xav txuas mus rau SWD interface ntawm RP2350. Ob lub pins, SWD thiab SWCLK, muaj nyob rau ntawm 2.54mm header, J3, kom tso cai rau kev sojntsuam debug ntawm koj xaiv kom yooj yim txuas. Ntxiv rau qhov no, kuv tau suav nrog JST header xaiv, uas tso cai rau kev sib txuas yooj yim rau Raspberry Pi Debug Probe. Koj tsis tas yuav siv qhov no, 2.54mm headers yuav txaus yog tias koj npaj siab yuav debug software, tab sis kuv pom tias nws yooj yim dua ua li ntawd. Kuv tau xaiv cov kab rov tav txuas, feem ntau vim kuv nyiam qhov zoo ntawm nws, txawm tias nws tsis nyob ntawm ntug ntawm lub rooj tsavxwm, tab sis cov kab ntsug muaj nyob, txawm tias muaj qhov sib txawv me ntsis.

Khawm
Tus tsim tsawg tam sim no tsis muaj ib qho, tab sis ob lub nyees khawm, qhov twg RP240 version tsis muaj. Ib qho yog rau USB khau raj xaiv raws li peb tau tham yav dhau los, tab sis qhov thib ob yog 'rov pib dua' khawm, hooked mus rau RUN tus pin. Ob leeg ntawm no tsis yog qhov tsim nyog nruj me ntsis (txawm tias lub pob BOOTSEL yuav tsum tau hloov nrog lub taub hau lossis zoo sib xws yog tias xav tau USB khau raj hom), thiab tuaj yeem raug tshem tawm yog tias qhov chaw lossis tus nqi muaj kev txhawj xeeb, tab sis lawv yeej ua rau siv RP2350 nyob deb. kev paub zoo dua.

Daim Ntawv Ntxiv A: Ua tiav Schematic -RP2350A version

Daim duab 15. Tag Nrho schematic ntawm Kev Tsim Tsawg Tsawg rau RP2350A

Daim Ntawv Ntxiv B: Ua tiav Schematic -RP2350B version

Daim duab 16. Tag Nrho schematic ntawm Kev Tsim Tsawg Tsawg rau RP2350B

Daim Ntawv Ntxiv H: Cov Ntaub Ntawv Tshaj Tawm Txog Keeb Kwm

Aug 8 2024
Kev tso tawm thawj zaug.

kuv Raspberry Pi
Raspberry Pi yog lub cim lag luam ntawm Raspberry Pi Ltd
Raspberry Pi Ltd liab

Cov ntaub ntawv / Cov ntaub ntawv

Raspberry Pi SC1631 Raspberry Microcontroller [ua pdf] Phau ntawv qhia
SC1631 Raspberry Microcontroller, SC1631, Raspberry Microcontroller, Microcontroller

Cov ntaub ntawv

Cov neeg siv phau ntawv

Raspberry Pi SC1631 Raspberry Microcontroller

Cov lus qhia siv khoom