Raspberry Pi SC1631 Raspberry Microcontroller Instruction Manual

Chitsauko 1: Nhanganyaya
Iyo RP2350 yakatevedzana inopa akasiyana mapakeji sarudzo kana ichienzaniswa neRP2040 yakatevedzana. Iyo RP2350A uye RP2354A inouya muQFN-60 package isina uye nemukati flash chengetedzo zvakateerana, nepo RP2354B neRP2350B vachiuya muQFN-80 package ine uye isina flash yekuchengetedza.

Chitsauko 2: Simba
Iyo RP2350 yakatevedzana inoratidzira nyowani pa-chip switching voltage regulator nemapini mashanu. Iyi regulator inoda zvinhu zvekunze zvekushanda asi inopa simba repamusoro pamagetsi epamusoro kana zvichienzaniswa neiyo linear regulator muRP2040 yakatevedzana. Teerera kune ruzha kunzwa muVREG_AVDD pini inopa analogue redunhu.

Mibvunzo Inowanzo bvunzwa (FAQ)

Q: Ndeupi musiyano mukuru pakati peRP2350A uye RP2350B?
A: Musiyano mukuru uri mukuvapo kwemukati flash kuchengetedza. RP2350A haina yemukati flash yekuchengetedza nepo RP2350B ichiita.
Mubvunzo: Mapini anoita voltage regulator mune RP2350 akatevedzana vane?
A: Bhukutage regulator muRP2350 akatevedzana ane mapini mashanu.

Hardware dhizaini neRP2350 Kushandisa RP2350 microcontrollers kuvaka mabhodhi uye zvigadzirwa.

Colophon

Zvinyorwa izvi zvinopihwa rezinesi pasi peCreative Commons Attribution-NoDerivatives 4.0 International (CC BY-ND). zuva rekuvaka: 2024-08-08 kuvaka-shanduro: c0acc5b-yakachena
Chiziviso chemutemo chekudzikinura

RASPBERRY PI DATA CHETEKONIKO NEKUVIMBIKA (KUsanganisira DATASHEETS) ZVINOCHINJWA NGUVA NENGUVA ("RESOURCES") ZVINOPIWA NERASPBERRY PI LTD ("RPL") "SEZVAZARI" UYE CHESE ZVINOTAURWA KANA KUTI ZVINHU ZVISI ZVINOBATSIRWA, ZVISI ZVINODIWA, KUTI, ZVINOREVEDZWA ZVIRATIDZO ZVEKUTENGA UYE KUKAKODZERA KUNE CHINANGWA CHECHINHU ZVINODIWA. KUNHU ZVIKURU ZVINOBVUMIRWA NEMUTEMO UNOSHANDISWA PANE CHIITIKO RPL ICHIFANIRA KUTI RPL ICHITIRE MHOSVA PAKUNHU CHEPI, ZVIRI MUKATI, ZVINOITIKA, ZVAKASIYANA, ZVINOITWA, KANA ZVINOGONA KUKABASWA (kusanganisira, ASI ZVISI ZVINOITA KUTI ZVINHU ZVINHU ZVINHU ZVINHU ZVINOITWA, ZVINHU ZVINOTAURWA, ZVINHU ZVINHU ZVINHU ZVINHU ZVINOITWA; , KANA MUPOROFITA; KANA KUKANGANISWA KWEBHAZINISI) ZVISINEI ZVAKAITWA UYE PAMUSORO CHESE CHEKUDA, ZVINO ZVINOITA MUCONTRACT, ZVINHU ZVAKASIYANA, KANA KUTAMBURA (KUSANGANA NEKUSHANDISWA KANA KUTI NEZVIMWEWO) ZVINOITIKA NEIPI NZIRA KUNZE KUSHANDISWA KWEZVINHU ZVINHU ZVINHU ZVINHU ZVINHU ZVINHU ZVINHU ZVINHU ZVAKASHANDISA ZVOKUKATADZWA KWAZVO.
RPL inochengetera kodzero yekugadzira chero zvigadziriso, gadziridzo, kugadzirisa kana chero zvimwe zvigadziriso kune RESOURCES kana chero zvigadzirwa zvinotsanangurwa mazviri chero nguva uye pasina chimwe chiziviso.
Iyo RESOURCES inoitirwa vashandisi vane hunyanzvi vane mazinga akakodzera eruzivo rwekugadzira. Vashandisi ndivo vane basa rekusarudza kwavo uye kushandiswa kweRESOURCES uye chero mashandisirwo ezvigadzirwa zvinotsanangurwa mazviri. Mushandisi anobvuma kubhadhara uye kubata RPL isingakuvadze pazvikwereti zvese, mutengo, kukuvadzwa kana kumwe kurasikirwa kunobva mukushandisa kwavo RESOURCES.

RPL inopa vashandisi mvumo yekushandisa iyo RESOURCES chete mukubatana neiyo Raspberry Pi zvigadzirwa. Kumwe kushandiswa kwese kweRESOURCES kunorambidzwa. Hapana rezinesi rinopihwa kune chero imwe RPL kana imwe yechitatu bato kodzero yekuziva pfuma.
ZVIITIKO ZVAKAWANDA PANGOZI. Zvigadzirwa zveRaspberry Pi hazvina kugadzirwa, kugadzirwa kana kuitirwa kushandiswa munzvimbo dzine njodzi dzinoda kusashanda kwakachengeteka, senge mukushanda kwezvivakwa zvenyukireya, kufamba nendege kana masisitimu ekutaurirana, kutonga kwemhepo, masisitimu ezvombo kana kuchengetedza-kukosha kwekushandisa (kusanganisira kutsigira hupenyu. masisitimu uye zvimwe zvigadziriso zvekurapa), umo kutadza kwezvigadzirwa kunogona kutungamira kurufu, kukuvara kwemunhu kana kukuvara kwakanyanya kwemuviri kana kwezvakatipoteredza ("High Risk Activities"). RPL inonyatso ramba chero yakaratidza kana yakarehwa waranti yekusimba Yepamusoro Njodzi Zviitiko uye haigamuchire mhosva yekushandisa kana kubatanidza yezvigadzirwa zveRaspberry Pi muPamusoro Njodzi Zviitiko.

Raspberry Pi zvigadzirwa zvinopihwa pasi peRPL's Standard Terms. Kupihwa kweRPL kweiyo RESOURCES hakuwedzere kana kusandura Matemu eRPL's Standards kusanganisira asi kwete kuganhurirwa kune zvirambidzo uye waranti inoratidzwa mazviri.

Chitsauko 1. Nhanganyaya

Mufananidzo 1. KiCad 3D inopa yeRP2350A Minimal dhizaini example

Patakatanga kuunza Raspberry Pi RP2040, isu takaburitsawo 'Minimal' dhizaini example uye inoperekedza gwara Hardware dhizaini neRP2040 iyo ine tarisiro yakatsanangura kuti RP2040 ingashandiswa sei mubhodhi redunhu rakareruka, uye nei sarudzo dzakasiyana dzechikamu dzakaitwa. Nekusvika kweRP235x nhevedzano, yave nguva yekudzokorora iyo yekutanga RP2040 Minimal dhizaini, uye nekuigadziridza kuti iverenge maficha matsva, uye zvakare kune yega yega akasiyana epakeji; iyo RP2350A ine QFN-60 package, uye RP2350B inova QFN-80. Zvekare, magadzirirwo aya ari muKicad (7.0) fomati, uye anowanikwa kudhawunirodha (https://datasheets.raspberrypi.com/rp2350/Minimal-KiCAD.zip).

The Minimal Board
Iyo yepakutanga Minimal board yaive yekuyedza kupa yakapusa referensi dhizaini, uchishandisa iyo isina hushoma yezvikamu zvekunze zvinodiwa kuti umhanye iyo RP2040 uye ichine iyo yese IO yakafumurwa uye inowanikwa. Izvi zvainyanya kuumbwa nemagetsi sosi (5V kusvika 3.3V linear regulator), crystal oscillator, flash memory, uye IO yekubatanidza (micro USB socket uye GPIO misoro). Iyo nyowani RP235x yakatevedzana Madiki mabhodhi akanyanya kufanana, asi neimwe shanduko inodiwa nekuda kweiyo hardware itsva. Pamusoro peizvi, uye kunyangwe ndichienda kupesana nehudiki hunhu hwedhizaini, ini ndawedzera akati wandei mabhatani ebhootsel uye kumhanya, pamwe neyakasiyana SWD musoro, izvo zvinofanirwa kureva zvisinganyanyi kushungurudza debug chiitiko panguva ino kutenderera. Madhizaini haanyatso kutaura anoda mabhatani aya, masaini achiri kuwanikwa pamisoro, uye anogona kusiiwa kana iwe uchinyanya kudhura kana nzvimbo yekuziva, kana uine masochistic maitiro.

RP2040 vs RP235x akatevedzana
Shanduko iri pachena iri mumapakeji. Ipo iyo RP2040 iri 7x7mm QFN-56, iyo RP235x yakatevedzana parizvino ine nhengo ina dzakasiyana. Pane zvishandiso zviviri zvinogovana zvakafanana QFN-60 package; iyo RP2350A iyo isina yemukati flash yekuchengetedza, uye iyo RP2354A inoita. Saizvozvo, iyo QFN-80 inouyawo mumhando mbiri; iyo RP2354B ine flash, uye RP2350B isina. Iyo QFN-60 zvishandiso uye yepakutanga RP2040 inogovana zvakafanana heritage.

Mumwe nemumwe ane makumi matatu maGPIO, mana acho akabatana neADC, uye ari 30x7mm muhukuru. Pasinei neizvi, iyo RP7A haisi yekudonhedza-in kutsiva iyo RP2350, sezvo huwandu hwepini pane imwe neimwe hwakasiyana. Kusiyana neizvi, maQFN-2040 machipi zvino ave ne80 GPIOs, uye masere eava ave kugona ADC. Nekuda kweizvi, isu tava neMinimal boards maviri; imwe ye48 pin devices, uye imwe ye60. Aya maMinimal boards anonyanya kugadzirirwa zvikamu zvisina mukati meflash (RP80), zvisinei magadzirirwo acho anogona kushandiswa zviri nyore nemukati memwenje madivayiri (RP2350) nekungosiya onboard flash. ndangariro, kana kuishandisa seyechipiri flash mudziyo (zvimwe pane izvi gare gare). Pane musiyano mudiki pakati pemabhodhi maviri, kunze kwekuti iyo QFN-2354 vhezheni ine mitsara yakareba yemusoro kuti igare iyo yakawedzera GPIO, uye bhodhi saka rakakura.

Kunze kwepakeji, iyo yakakura bhodhi-level musiyano pakati peRP235x akatevedzana uye RP2040 ndiwo emagetsi emagetsi. Iyo RP235x yakatevedzana ine mamwe mapini emagetsi matsva, uye yakasiyana yemukati regulator. Iyo 100mA linear regulator yeRP2040 yakatsiviwa ne200mA switching regulator, uye nekudaro, inoda imwe yakanyatso tenderera, uye hapana kudiki kutariswa kunoitwa nemagadzirirwo. Zvinokurudzirwa kuti unyatsotevera marongerwo edu uye sarudzo dzechikamu; Tatopfuura nekurwadziwa kwekuita kudzokorora kwakati wandei kwedhizaini, saka ndinovimba haufanirwe kudaro.

Mufananidzo 2. KiCad 3D inopa yeRP2350B Minimal dhizaini ex.ample

The Design
Chinangwa cheMinimal dhizaini exampLes ndeyekugadzira maviri emapuranga akareruka uchishandisa iyo RP235x yakatevedzana, iyo inofanirwa kuve yakachipa uye nyore kugadzirwa, pasina kushandisa zvisina kufanira exotic PCB tekinoroji. Iwo maMinimal boards saka 2 layer madhizaini, achishandisa zvikamu izvo zvinofanirwa kuwanikwa kazhinji, uye zvese zvakasimudzwa padivi repamusoro pebhodhi. Kunyange zvingave zvakanaka kushandisa zvinhu zvakakura, zviri nyore-kutengesa nemaoko, iyo diki diki yemachipi eQFN (0.4mm) zvinoreva kuti kushandisa mamwe 0402 (1005 metric) passive components hazvidzivisike kana maGPIO ese achizoshandiswa. Nepo kushambadzira nemaoko 0402 zvikamu zvisinganyanyi kunetsa nesimbi ine hunhu, zvinenge zvisingaite kutengesa maQFN pasina midziyo yehunyanzvi.

Pamusoro pezvikamu zvishoma zvinotevera, ndichaedza kutsanangura kuti dunhu rekuwedzera nderei, uye ndinovimba kuti takauya sei pakuita sarudzo dzatakaita. Sezvo ini ndichave ndichitaura nezve maviri akapatsanurwa madhizaini, imwe yega yega saizi yepasuru, ndaedza kuita kuti zvinhu zvive nyore sezvandinogona. Sezvinogoneka, ese mareferensi ezvikamu zvemabhodhi maviri akafanana, saka kana ndikataura kuU1, R1, nezvimwe, saka zvine basa zvakaenzana kumabhodhi ese ari maviri. Chinhu chiri pachena ndechekuti chikamu chiri pane rimwe remabhodhi (muzviitiko zvese, izvi zvichange zviri pane yakakura 80 pini musiyano), ipapo chikamu chiri mubvunzo chinenge chiri paQFN-80 dhizaini; zve example, R13 inongowanikwa pabhodhi iri.

Chitsauko 2. Simba

Iwo magetsi eiyo RP235x akatevedzana uye iyo RP2040 inosiyana panguva ino kutenderera, kunyangwe mukurongeka kwayo, ichiri kuda zvinhu zviviri, 3.3V uye 1.1V. Iwo RP235x akateedzana ari panguva imwe chete ane nzara yesimba, sezvo iri kuita kwepamusoro, uye zvakare yakawandisa (kana iri mune yakaderera simba simba) kupfuura yayakatangira, uye saka iyo mutsara regulator paRP2040 yakakwidziridzwa ine switching regulator. Izvi zvinotitendera hukuru hwesimba pamhepo dzepamusoro (kusvika ku200mA zvichienzaniswa ne100mA kare).

New on-chip voltage mutongi

Mufananidzo 3. Schematic chikamu chinoratidza mukati regulator circuit

Iyo linear regulator yeRP2040 yaive nemapini maviri, 3.3V yekuisa, uye 1.1V yakabuda yekupa iyo DVDD pane chip. Panguva ino, mutongi weRP235x akatevedzana ane mapini mashanu, uye anoda chimwe chekunze chinoumba kuti chishande. Nepo izvi zvichiita kunge nhanho yekudzokera kumashure maererano nekushandisa, iyo switching regulator ine advantage yekuva nesimba rakawanda pamagetsi emutoro wepamusoro.

Sezvinoratidzwa nezita racho, regulator inokurumidza kudzima nekudzima transistor yemukati inobatanidza iyo 3.3V yekupinza vol.tage (VREG_VIN) kune VREG_LX pini, uye nerubatsiro rweinductor (L1) uye inobuda capacitor (C7), inogona kuburitsa DC inobuda vol.tage iyo yakatsikwa-pasi kubva pakuiswa. Iyo VREG_FB pini inotarisisa inobuda voltage, uye inogadzirisa iyo on / off reshiyo yekuchinja kutenderera, kuve nechokwadi kuti inodiwa voltage inochengetwa. Sezvo mafungu mahombe achichinjirwa kubva kuVREG_VIN kuenda kuVREG_LX, hombe capacitor (C6) padhuze nekupinza inodiwa, saka isu hatigumbure iyo 3.3V inopa zvakanyanya. Kutaura nezve aya makuru ekuchinja mafungu, iyo regulator inouyawo neyayo yeivhu yekudzoka yekubatanidza, VREG_PGND. Saizvozvo neVREG_VIN neVREG_LX, marongerwo ekubatanidza uku kwakakosha, uye nepo VREG_PGND ichifanira kubatana neGND huru, inofanira kuitwa nenzira yekuti mafungu makuru ese anochinja anodzokera zvakananga kuPGND pini, pasina kukanganisa mamwe ese. GND yakawandisa.

Pini yekupedzisira ndeye VREG_AVDD, iyo inopa analogue yedunhu mukati memutongi, uye izvi zvinonzwa ruzha.

Mufananidzo 4. Chikamu cheSchematic chinoratidza PCB marongerwo emutongi

Kurongeka kwemutongi pamapuranga mashoma anonyatso ratidza iyo yeRaspberry Pi Pico 2. Basa guru rakapinda mukugadzirwa kwedunhu rino, nekudzokorora kwakawanda kwePCB kunodiwa kuitira kuti ive yakanaka sezvatingagona. anogona. Nepo iwe uchigona kuisa izvi zvikamu nenzira dzakasiyana siyana uye uchiri kuita kuti regulator 'ishande' (kureva, gadzira inobuda vol.tage padanho chairo, rakanakira kuti riite kodhi), takaona kuti mutongi wedu anoda kubatwa nenzira chaiyo kuti arambe achifara, uye nekufara, ndinoreva kugadzira iro chairo kubuda vol.tage pasi pehuwandu hwemutoro wezvino mamiriro.
Tichiri kuita zviedzo zvedu pane izvi, takamboodzwa mwoyo kuyeuchidzwa kuti nyika isingaite yefizikisi haigone kufuratirwa. Isu, semainjiniya, tinoedza zvakanyanya uye kuita izvi chaizvo; kurerutsa zvikamu, kufuratira (kazhinji) zvinhu zvisingakoshi zvemuviri, uye pachinzvimbo chekutarisa pazvinhu zvatinofarira. For ex.ample, nyore resistor haingove nekupikisa, asiwo inductance, nezvimwewo. Muchiitiko chedu, isu (re) takaona kuti inductors ine magnetic field yakabatana navo, uye zvakakosha, inopenya munzira zvichienderana nenzira ipi iyo coil. iri ronda, uye nzira yekuyerera kwezvino. Isu takayeuchidzwa zvakare kuti 'zvakazara' akadzivirirwa inductor hazvireve zvaunofunga kuti zvingaite. Iyo magnetic field yakaderedzwa kusvika pamwero mukuru, asi vamwe vachiri kutiza. Isu takaona kuti kuita kwemutongi kunogona kuvandudzwa zvakanyanya kana inductor iri 'iyo nzira yekutenderera'.
Zvinoitika kuti iyo magineti inobuda kubva kune 'yakaipa nzira kutenderera' inductor inokanganisa iyo regulator inobuda capacitor (C7), iyo inozokanganisa dhizaini yekudzora mukati meRP2350. Ne inductor mugwara rakakodzera, uye marongero chaiwo uye sarudzo dzechikamu dzinoshandiswa pano, zvino dambudziko iri rinoenda. Pachave pasina kupokana kune mamwe marongero, zvikamu, nezvimwe, izvo zvinogona kushanda neinductor mune chero maitiro, asi ivo vangango shandisa yakawanda PCB nzvimbo kuti vadaro. Isu takapa iyi yakakurudzirwa dhizaini kuchengetedza vanhu maawa akawanda einjiniya atakashandisa kugadzira nekugadzirisa iyi compact uye ine maitiro akanaka mhinduro.
Zvakawanda kusvika padanho, tave kusvika pakutaura kuti kana ukasarudza kusashandisa ex yeduample, wobva wazviita panjodzi yako. Zvakawanda sezvatinotoita neRP2040 uye crystal circuit, kwatinosimbirira (zvakanaka, kurudzira zvakasimba) iwe unoshandisa imwe chikamu (tichaita zvakare muchikamu chekristaro chegwaro iri).
Iyo yekumisikidza kweaya madiki inductors akanyanya kufuratirwa pasi rose, nekutarisa kweiyo coil inomonereka isingagone kuburitsa, uye zvakare kugovaniswa zvisina tsarukano pamwe nereel yezvikamu. Mahombe einductor makesi saizi anogona kuwanikwa aine polarity markings paari, zvisinei hatina kuwana akakodzera mu0806 (2016 metric) saizi yekesi yatakasarudza. Kuti izvi zviitike, takashanda naAbracon kugadzira chikamu che 3.3μH chine dot kuratidza polarity, uye zvakakosha, huya pane reel navo vese vakaenderana nenzira imwechete. Iwo TBD ari (kana achaita munguva pfupi pfupi) kuti awanikwe kune veruzhinji kubva kune vanogovera. Sezvambotaurwa, iyo VREG_AVDD inopa inonzwa zvakanyanya kune ruzha, uye nekudaro inoda kusefa. Isu takaona kuti sezvo VREG_AVDD inongodhonza kutenderedza 200μA, RC sefa ye33Ω uye 4.7μF yakakwana.
Saka, kudzokorora, zvikamu zvinoshandiswa zvichave…
- C6, C7 & C9 – 4.7μF (0402, 1005 metric)
- L1 – Abracon TBD (0806, 2016 metric)
- R3 – 33Ω (0402, 1005 metric)
Iyo RP2350 dhetabheti ine hurukuro yakadzama pane yedhizaini dhizaini, ndapota ona Zvekunze Zvikamu uye PCB dhizaini zvinodiwa.

Inzwa Zvinowanikwa

Iyo yekupinza simba rekubatanidza dhizaini iyi iri kuburikidza ne5V VBUS pini yeMicro-USB yekubatanidza (yakanyorwa J1 muFigure 5). Iyi inzira yakajairika yekusimbisa zvigadziriso zvemagetsi, uye zvine musoro pano, sezvo RP2350 ine USB mashandiro, ayo isu tichave wiring kumapini e data echibatanidza ichi. Sezvo isu tichingoda chete 3.3V yedhizaini iyi (iyo 1.1V inopihwa inobva mukati), isu tinofanirwa kudzikisa inouya 5V USB inopihwa, mune iyi kesi, tichishandisa imwe, yekunze vol.tage regulator, mune iyi mutsara regulator (aka Low Drop Out regulator, kana LDO). Sezvo ndakamborumbidza kunaka kwekushandisa inoshanda switching regulator, inogona zvakare kuve sarudzo yehungwaru kushandisa imwe pano futi, asi ini ndasarudza kuve nyore. Chekutanga, kushandisa LDO kunogara kuri nyore. Iko hakuna kuverenga kunodiwa kuti uone kuti ndeapi saizi inductor yaunofanira kushandisa, kana kuti yakakura sei iyo inobuda capacitors, uye marongero anowanzo kuve akatwasanuka zvakare. Chechipiri, kuchengetedza donhwe rekupedzisira resimba handicho chinangwa pano; dai zvanga zviri izvo, ndainyatso funga kushandisa switching regulator, uye unogona kuwana example yekuita kudaro paRaspberry Pi Pico 2. Uye chechitatu, ndinogona kungo 'kwereta' dunhu randakamboshandisa paRP2040 shanduro yeMinimal board. Iyo NCP1117 (U2) yakasarudzwa pano ine yakagadziriswa kubuda kwe3.3V, inowanikwa zvakanyanya, uye inogona kupa kusvika ku1A yezvino, inova yakawanda kune akawanda magadzirirwo. Kutarisa padhetabheti yeNCP1117 inotiudza kuti chishandiso ichi chinoda 10μF capacitor pane yekuisa, uye imwe pane inobuda (C1 neC5).

Decoupling capacitors

Mufananidzo 6. Chikamu cheSchematic chinoratidza iyo RP2350 magetsi emagetsi ekuisa, voltage regulator uye decoupling capacitors

Chimwe chikamu chemagetsi ekugadzira dhizaini ndeye decoupling capacitors inodiwa RP2350. Izvi zvinopa maviri akakosha mabasa. Chekutanga, ivo vanosefa kunze kwemagetsi emagetsi ruzha, uye chechipiri, vanopa yemuno yekuchaja iyo masekete ari mukati meRP2350 anogona kushandisa munguva pfupi. Izvi zvinodzivirira voltage nhanho munzvimbo yepedyo kubva pakudonha zvakanyanya kana ikozvino kudiwa kuchiwedzera nekukurumidza. Nokuti, pane izvi, zvakakosha kuisa decoupling pedyo nemapini emagetsi. Kazhinji, isu tinokurudzira kushandiswa kwe100nF capacitor papini yemagetsi, zvisinei, isu tinosiya mutemo uyu mune akati wandei.

Mufananidzo 7. Chikamu chekugadzirisa chinoratidza RP2350 routing uye decoupling

Chekutanga, kuitira kuti tive nenzvimbo yakakwana yekuti ese mapini epini akwanise kuburitswa kunze, kure nemudziyo, isu tinofanirwa kukanganisa nehuwandu hwe decoupling capacitors atinogona kushandisa. Mukugadzirwa uku, mapini 53 ne54 eRP2350A (pini 68 uye 69 yeRP2350B) anogovera capacitor imwe chete (C12 muMufananidzo 7 uye Mufananidzo 6), sezvo pasina nzvimbo yakawanda kudivi iro remudziyo, uye zvikamu. uye marongerwo emugadziri anotora pamberi.
Kushaikwa kwenzvimbo uku kunogona kukundwa kana tikashandisa tekinoroji yakaoma/inodhura, senge zvidimbu zvidiki, kana mana PCB ine zvikamu pamativi ese epamusoro nepasi. Uku ndiko kutengeserana kwekugadzira; isu tadzikisira kuomarara uye mutengo, pamutengo wekuve nekushomeka kwekugadzirisa capacitance, uye macapacitor ayo ari kure zvishoma kubva kune chip pane ari optimal (izvi zvinowedzera inductance). Izvi zvinogona kuve nemhedzisiro yekudzikamisa kumhanya kwakanyanya dhizaini inogona kushanda pairi, se voltage supply inogona kuita ruzha rwakanyanya uye ichidonha pasi peiyo shoma inobvumirwa voltage; asi kune akawanda maapplication, kutengeserana uku kunofanirwa kugamuchirwa.

Imwe kutsauka kubva kumutemo we100nF ndeyekuti isu tiwedzere kuvandudza voltage regulator performance; tinokurudzira kushandisa 4.7μF yeC10, iyo inoiswa kune rumwe rutivi rwechiputi kubva kumutongi.

Chitsauko 3. Flash Memory

Primary flash

Mufananidzo 8. Schematic chikamu chinoratidza primary flash memory uye USB_BOOT circuitry

Kuti tikwanise kuchengeta kodhi yepurogiramu iyo RP2350 inogona kubhutsu nekumhanya kubva, isu tinofanirwa kushandisa flash memory, kunyanya, quad SPI flash memory. Mudziyo wakasarudzwa pano ndeye W25Q128JVS mudziyo (U3 muFigure 8), inova 128Mbit chip (16MB). Iyi ndiyo saizi yakakura yekurangarira iyo RP2350 inogona kutsigira. Kana yako application isingade yakawandisa yekuchengetedza, saka diki, yakachipa ndangariro inogona kushandiswa pachinzvimbo.
Sezvo iyi databus inogona kunge yakakwira frequency uye inogara ichishandiswa, mapini eQSPI eRP2350 anofanirwa kuve newaya akananga kuflash, achishandisa mapfupi ekubatanidza kuchengetedza chiratidzo chekuvimbika, uye zvakare kuderedza crosstalk mumaseketi akatenderedza. Crosstalk ndiko uko masaini pane imwe dunhu mambure anogona kupinza risingadiwe voltages padunhu rakavakidzana, zvichiita kuti kukanganisa kuitike.

Iyo QSPI_SS chiratidzo inyaya yakakosha. Iyo yakabatana nemwenje zvakananga, asi zvakare ine maviri anopikisa (zvakanaka, mana, asi ini ndichauya kune iyo gare gare) yakabatana nayo. Yekutanga (R1) ndeyekudhonza-kumusoro kune iyo 3.3V inopa. Iyo flash memory inoda iyo chip-select yekuisa kuti ive pairi voltage seyayo 3.3V yekupa pini sezvo mudziyo uchikwidzwa simba, zvikasadaro, haishande nemazvo. Kana iyo RP2350 ichikwidzwa simba, pini yayo yeQSPI_SS inongomira kudhonza-kumusoro, asi pane nguva pfupi panguva yekuchinja-chinja uko mamiriro eQSPI_SS pini haagone kuvimbiswa. Kuwedzerwa kwekudhonza-up resistor kunovimbisa kuti ichi chinodiwa chinogara chichigutsikana. R1 yakanyorwa seDNF (Usakwana) pane schematic, sezvatakaona kuti neiyi chaiyo flash mudziyo, yekunze yekudhonza-kumusoro haina basa. Nekudaro, kana mwenje wakasiyana ukashandiswa, zvingave zvakakosha kuti ukwanise kuisa 10kΩ resistor pano, saka yakaverengerwa kuti zvingoitika.
Yechipiri resistor (R6) i1kΩ resistor, yakabatana nebhatani rekudzvanya (SW1) rakanyorwa 'USB_BOOT'. Izvi zvinodaro nekuti iyo QSPI_SS pini inoshandiswa se'boot strap'; RP2350 inotarisa kukosha kweiyi I/O panguva yekutevedzana kwebhoti, uye kana ikaonekwa iine logic 0, ipapo RP2350 inodzokera kuBOOTSEL modhi, uko RP2350 inozviratidza se USB yakawanda yekuchengetedza mudziyo, uye kodhi inogona kukopwa zvakananga. kwairi. Kana tikangodzvanya bhatani, tinodhonzera QSPI_SS pini pasi, uye kana chishandiso chichibva chagadziriswazve (semuenzaniso nekutangisa pini yeRUN), RP2350 ichatangazve muBOOTSEL modhi pane kuedza kumhanya zviri mukati memwenje. Aya anopikisa, R2 neR6 (R9 neR10 zvakare), anofanirwa kuiswa padyo neflash chip, saka isu tinodzivirira humwe hurefu hwemakwara emhangura ayo anogona kukanganisa chiratidzo.
Zvese zviri pamusoro zvinonyanya kushanda kune iyo RP2350, iyo isina yemukati flash. Ehe, iyo RP2354 zvishandiso zvine zvemukati 2MB flash ndangariro, saka yekunze U3 ndangariro haidiwe, saka U3 inogona kubviswa zvakachengeteka kubva muchirongwa, kana kungosiiwa isina vanhu. Mune imwe yezviitiko izvi, tinenge tichida kuchengetedza USB_BOOT switch yakabatana neQSPI_SS, kuti tikwanise kupinda USB boot mode.

Sekondari flash kana PSRAM

Iyo RP235x yakatevedzana ikozvino inotsigira yechipiri ndangariro mudziyo uchishandisa yakafanana QSPI pini, ine GPIO inopa yekuwedzera chip yakasarudzwa. Saka, kana isu tiri kushandisa RP2354 (ine mukati meflash), saka tinogona kushandisa U3 sechipiri mwenje, kana kutoitsiva nePSRAM mudziyo. Kuti tiite izvi, tinoda kubvisa QSPI_SS kubva kuU3, uye panzvimbo pacho toibatanidza kune yakakodzera GPIO panzvimbo. Iyo yepedyo GPIO inokwanisa kuve chip sarudza (XIP_CS1n) iGPIO0, saka nekubvisa iyo 0Ω kubva kuR10, uye nekuiisa kuR9, isu tinogona ikozvino kuwana U3 mukuwedzera kune-chip flash. Kuti utore zvizere advantage yechinhu ichi, patine maviri ekunze ndangariro maturusi kuitira kuti flash-shoma RP2350 zvikamu zvigone kubatsirwa, iyo hombe yemaMinimal board, yeRP2350B, inosanganisira inosarudzika tsoka (U4) yekuwedzera memory chip.

Mufananidzo 9. Chikamu chechirongwa chinoratidza sarudzo yechipiri yekuyeuka mudziyo

Kuti ukwanise kushandisa chishandiso ichi, zviri pachena kuti chinofanirwa kuve nevanhu, pamwe neR11 (0Ω), uye R13 (10KΩ). Kuwedzerwa kweR11 kunobatanidza GPIO0 (iyo XIP_CS1n chiratidzo) kune chip sarudza chechipiri ndangariro. Iyo yekudhonza-kumusoro pane chip sarudza pini inonyatso kudiwa panguva ino, sezvo iyo yekusarudzika mamiriro eGPIO0 ichadhonzwa yakaderera pamagetsi-kumusoro, izvo zvingaite kuti flash mudziyo wedu utadze. C22 yaizodiwawo kuti ipe simba renzvimbo yekubvisa magetsi eU4.

Inotsigirwa flash chips
Iyo yekutanga flash probe sequence, inoshandiswa nepasi kuburitsa yechipiri stage kubva kuflash, inoshandisa 03h serial kuverenga command, ine 24-bit addressing, uye serial wachi inosvika 1MHz. Inoramba ichitenderera kuburikidza nemasanganiswa mana ewachi polarity uye wachi chikamu, ichitsvaga inoshanda sekondi s.taguye CRC32 checksum.
Sechipiri stage inozosununguka kugadzirisa-execute-mu-nzvimbo uchishandisa yakafanana 03h serial kuverenga command, RP2350 inogona kuita cached flash execute-in-nzvimbo nechero chip inotsigira 03h serial kuverenga ne 24-bit addressing, iyo inosanganisira akawanda 25-series flash zvishandiso. . Iyo SDK inopa example yechipiri stage yeCPOL=0 CPHA=0, pa https://github.com/raspberrypi/pico-sdk/blob/master/src/rp2350/boot_stage2/boot2_generic_03h.S. Kutsigira flash programming uchishandisa maitiro ari pazasi, mudziyo unofanirwawo kupindura kune inotevera mirairo:

02h 256-byte peji purogiramu
05h mamiriro ekunyora akaverengwa
06h seti kunyora gonesa latch

20h 4kB chikamu kudzima

RP2350 inotsigirawo akasiyana-siyana maviri-SPI uye QSPI nzira dzekuwana. For example, https://github.com/raspberrypi/pico-sdk/blob/master/src/rp2350/boot_stage2/boot2_w25q080.S inogadzirisa Winbond W25Q-series device ye quad-IO inoenderera mberi kuverenga mode, apo RP2350 inotumira quad-IO kero (isina prefix yekuraira) uye flash inopindura ne quad-IO data.

Kumwe kuchenjerera kunodiwa neflash XIP modhi apo iyo flash mudziyo inomira kupindura kune yakajairwa serial mirairo, seWinbond inoenderera yekuverenga modhi yataurwa pamusoro. Izvi zvinogona kukonzera nyaya kana RP2350 ikagadziridzwa, asi iyo flash mudziyo haina simba-kutenderera, nekuti iyo flash haizopindure kune iyo bootrom's flash probe sequence. Asati aburitsa 03h serial kuverenga, iyo bootrom inogara ichiburitsa inotevera yakatemerwa kutevedzana, iri yakanakisa-yekuedza kutevedzana yekumisa XIP pane dzakasiyana siyana dzemagetsi:

CSn=1, IO[3:0]=4'b0000 (kuburikidza nekudhonza pasi kudzivirira kukakavara), buritsa ×32 wachi
CSn=0, IO[3:0]=4'b1111 (kuburikidza nekudhonza kumusoro kudzivirira kukakavara), buritsa ×32 wachi
CSn=1

CSn=0, MOSI=1'b1 (inotyairwa yakaderera-Z, mamwe ese maI/Os Hi-Z), chinyorwa ×16 wachi

Kana mudziyo wako wakasarudzwa ukasapindura kutevedzana uku kana uri mumodhi yekuenderera mberi yekuverenga, saka inofanirwa kuchengetedzwa munzvimbo inotamiswa yega yega neye serial command, zvikasadaro RP2350 haizokwanisa kupora zvichitevera kuseta kwemukati.
Kuti uwane rumwe ruzivo nezve QSPI, ndapota ona QSPI Memory Interface (QMI) mu RP2350 database.

Chitsauko 4. Crystal Oscillator

Mufananidzo 10. Schematic chikamu chinoratidza crystal oscillator uye mutoro capacitors

Kunyatsotaura, RP2350 haidi chaizvo yekunze wachi sosi, sezvo iine yayo yemukati oscillator. Nekudaro, sezvo kuwanda kweiyo oscillator yemukati haina kunyatsotsanangurwa kana kudzorwa, kusiyanisa kubva kune chip kuenda kune chip, pamwe nekusiyana kwekupa vol.tages uye tembiricha, zvinokurudzirwa kushandisa yakagadzikana yekunze frequency sosi. Zvishandiso zvinotsamira pane chaiyo frequency hazvigoneke pasina yekunze frequency sosi, USB iri yekutanga example.
Kupa yekunze frequency sosi inogona kuitwa mune imwe yenzira mbiri: kungave nekupa wachi sosi ine CMOS inobuda (square wave yeIOVDD vol.tage) mupini yeXIN, kana nekushandisa 12MHz kristaro yakabatana pakati
XIN uye XOUT. Kushandisa kristaro ndiyo inosarudzika sarudzo pano, sezvo ese ari maviri akachipa uye akanyatsojeka.

Iyo kristaro yakasarudzwa yedhizaini iyi ndeye ABM8-272-T3 (Y1 muMufananidzo 10). Iyi ndiyo yakafanana 12MHz crystal inoshandiswa paRaspberry Pi Pico uye Raspberry Pi Pico 2. Isu tinokurudzira zvikuru kushandisa kristaro iyi pamwe chete neinotenderera inotenderera kuti tive nechokwadi chokuti wachi inotanga nokukurumidza pasi pemamiriro ose pasina kukuvadza kristaro pachayo. Iyo crystal ine 30ppm frequency kushivirira, iyo inofanirwa kuve yakanaka zvakakwana kune akawanda maapplication. Pamwe chete nefrequency kushivirira kwe+/- 30ppm, ine yakakura ESR ye50Ω, uye inotakura capacitance ye10pF, zvese zviri zviviri zvine chekuita nesarudzo yezvikamu zvinoperekedza.
Kuti kristaro itenderere painodiwa frequency, mugadziri anotsanangudza simba remutoro rainoda kuti riite, uye mune iyi kesi, iri 10pF. Iyi capacitance inotakura inowanikwa nekuisa maviri capacitors emutengo wakaenzana, imwe kune rumwe rutivi rwekristaro kusvika pasi (C3 neC4). Kubva panzvimbo yekristaro ye view, aya ma capacitor akabatanidzwa munhevedzano pakati pematerminals ayo maviri. Basic circuit theory inotiudza kuti vanobatana kuti vape capacitance ye (C3*C4)/(C3+C4), uye seC3=C4,zvino ingori C3/2. Mune example, takashandisa 15pF capacitors, saka musanganiswa wenhevedzano ndeye 7.5pF. Pamusoro peichi chinangwa chekuremedza capacitance, isu tinofanirwawo kuwedzera kukosha kwekusaziva kwekuwedzera capacitance, kana parasitic capacitance, yatinowana kubva kuPCB tracks uye XIN uye XOUT mapini eRP2350. Tichatora kukosha kwe3pF pane izvi, uye sezvo kugona uku kuri kufambirana neC3 neC4, isu tinongowedzera izvi kutipa huwandu hwese hwekuremerwa hwe10.5pF, iri padyo zvakakwana kune chinangwa che10pF. Sezvauri kuona, iyo parasitic capacitance yePCB traces chinhu, uye isu nekudaro tinofanirwa kuzvichengeta zvidiki kuti tisagumbure kristaro uye kuimisa kutenderera sezvakarongwa. Edza uye chengeta marongero ari mapfupi sezvinobvira.
Yechipiri yekufunga ndeye yakanyanya ESR (yakaenzana inoteedzana kuramba) yekristaro. Isu takasarudza mudziyo une huwandu hwe50Ω, sezvo takaona kuti iyi, pamwe ne1kΩ series resistor (R2), yakakosha kudzivirira kuti kristaro ifambiswe zvakanyanya uye kukuvara kana uchishandisa IOVDD. chiyero che 3.3V. Nekudaro, kana IOVDD iri pasi pe 3.3V, ipapo dhiraivha yeXIN/XOUT pini inodzikiswa, uye uchaona kuti amplitude yekristaro yakadzikira, kana inogona kusatombotenderera zvachose. Muchiitiko ichi, kukosha kudiki kweiyo inopikisa resistor inoda kushandiswa. Chero kutsauka kubva kudunhu rekristaro rinoratidzwa pano, kana neiyo IOVDD nhanho kunze kwe3.3V, inoda kuyedzwa kwakawanda kuti ive nechokwadi chekuti kristaro inodzika pasi pemamiriro ese, uye inotanga-kukwira zvakaringana nekukurumidza kuti isakonzerese matambudziko nechikumbiro chako.

Yakakurudzirwa crystal

Kune ekutanga magadzirirwo uchishandisa RP2350 isu tinokurudzira kushandisa iyo Abracon ABM8-272-T3. For example, kuwedzera kune yakaderera dhizaini example, ona Pico 2 board schematic muAppendix B yeRaspberry Pi Pico 2 Datasheet uye Pico 2 dhizaini. files.
Nekuita kwepamusoro uye kugadzikana pane akajairwa tembiricha yekushanda, shandisa iyo Abracon ABM8-272-T3. Iwe unogona kutora iyo ABM8-272-T3 zvakananga kubva kuAbracon kana kubva kune ane mvumo mutengesi. Pico 2 yakanyatso kurongedzerwa iyo ABM8-272-T3, ine zvinotevera zvirevo:

Kunyangwe iwe ukashandisa kristaro ine zvirevo zvakafanana, iwe unozofanirwa kuyedza dunhu pamusoro pemhando yetembiricha kuti uve nechokwadi chekugadzikana.
Iyo crystal oscillator inopihwa simba kubva kuIOVDD voltage. Nekuda kweizvozvo, iyo Abracon crystal uye iyo chaiyo damping resistor yakagadzirirwa 3.3V kushanda. Kana ukashandisa rimwe IO voltage, iwe unozofanirwa kudzokorora.
Chero shanduko kukristaro paramita ine njodzi kusagadzikana kune chero zvikamu zvakabatana nekristaro redunhu.

Kana iwe usingakwanise kupa iyo yakakurudzirwa crystal yakananga kubva kuAbracon kana mutengesi, bata applications@raspberrypi.com.

Chitsauko 5. IOs

USB
Mufananidzo 11. Schematic chikamu chinoratidza USB mapini eRP2350 uye nhevedzano kugumisa.

Iyo RP2350 inopa mapini maviri kuti ashandiswe kuzara kumhanya (FS) kana yakaderera kasi (LS) USB, ingave semugamuchiri kana mudziyo, zvinoenderana nesoftware inoshandiswa. Sezvatakambokurukura, RP2350 inogonawo kubhutsu se USB yakawanda yekuchengetedza mudziyo, saka kusungirira mapini aya ku USB yekubatanidza (J1 muFigure 5) zvine musoro. Iyo USB_DP uye USB_DM pini paRP2350 haidi chero imwe yekuwedzera kudhonza-kumusoro kana kudhonzera-pasi (inodiwa kuratidza kumhanya, FS kana LS, kana ingave iri host kana mudziyo), sezvo izvi zvakavakwa mukati maI/Os. Nekudaro, aya maI/O anoda 27Ω akateedzera kumisa resistors (R7 neR8 muMufananidzo 11), akaiswa padyo nechip, kuitira kuti asangane neiyo USB impedance yakatarwa.
Kunyangwe RP2350 inogumira kune yakazara yekumhanyisa data chiyero (12Mbps), isu tinofanirwa kuedza uye nekuita shuwa kuti hunhu hunokanganisa tambo dzekutumira (maturu emhangura anobatanidza chip kune chinongedzo) ari padyo ne
USB yakatarwa ye90Ω (yakayerwa zvakasiyana). Pane 1mm gobvu bhodhi rakaita seizvi, kana tikashandisa 0.8mm yakafara tracks pa USB_DP uye USB_DM, ine gap re 0.15mm pakati pawo, isu tinofanirwa kuwana mutsauko hunhu impedance inosvika 90Ω. Izvi ndezvekuona kuti masaini anogona kufamba neaya mitsara yekufambisa zvakachena sezvinobvira, kuderedza voltage reflections iyo inogona kuderedza kutendeseka kwechiratidzo. Kuti mitsara yekufambisa iyi ishande nemazvo, tinoda kuve nechokwadi kuti pazasi pemitsara iyi ivhu. Nzvimbo yakasimba, isina kukanganiswa yemhangura yevhu, inotambanudza urefu hwose hwenzira. Pane iyi dhizaini, inenge yese yese yepasi yemhangura layer yakapihwa pasi, uye kunyanya kutariswa kwakatorwa kuve nechokwadi kuti maturu e USB anopfuura chero chinhu kunze kwepasi. Kana PCB yakakora kupfuura 1mm yasarudzirwa kuvaka kwako, saka isu tine sarudzo mbiri. Tinogona kugadziridzazve mitsara yekufambisa ye USB kubhadharira chinhambwe chikuru pakati penjanji nepasi pazasi (zvingave zvisingagoneke mumuviri), kana isu tinogona kuzvifuratira, uye tariro yezvakanakisa. USB FS inogona kuregerera, asi mileage yako inogona kusiyana. Inogona kushanda mumashandisirwo mazhinji, asi ingangove isingaenderane neiyo USB standard.

I/O misoro

Mufananidzo 12. Chikamu cheSchematic chinoratidza 2.54mm I / O misoro yeQFN60 version

Pamusoro peiyo USB yekubatanidza yatotaurwa, kune maviri maviri mutsara 2.54mm misoro (J2 uye J3 muFigure 12), imwe kudivi rimwe nerimwe rebhodhi, iyo iyo yese yeI / O yakabatanidzwa. Pane makumi matatu GPIO paRP30A, nepo paine makumi mana nemasere GPIO paRP2350B, saka misoro pavhezheni iyi yeMinimal board yakakura kubvumidza mamwe mapini (ona Mufananidzo 48).
Sezvo ichi chiri dhizaini yechinangwa, isina imwe application mupfungwa, iyo I/O yakaitwa kuti iwanikwe kuti ibatanidzwe sekuda kwemushandisi. Mutsara wemukati wemapini pamusoro wega wega ndiwo maI / Os, uye mutsara wekunze wakabatanidzwa pasi. Itsika yakanaka kusanganisa akawanda zvikonzero paI/O majoini. Izvi zvinobatsira kuchengetedza yakaderera impedance ivhu, uye zvakare kupa akawanda angangoita nzira dzekudzoka dzemhepo dzinofamba kuenda nekubva
I/O zvinongedzo. Izvi zvakakosha kudzikisa kukanganiswa kwe electro-magnetic izvo zvinogona kukonzerwa nekudzoka kwemasaini ekukurumidza kushandura masaini achitora marefu, ekutenderera nzira kuti apedze dunhu.

Misoro miviri iri pane imwechete 2.54mm grid, izvo zvinoita kuti kubatanidza bhodhi iri kune zvimwe zvinhu, senge mabhodhi echingwa, zvive nyore. Ungangoda kufunga nezvekukodzera musoro wemutsara mumwe chete pachinzvimbo chemusoro wemitsara miviri, uchigovera nekunze mutsara wekubatanidza pasi, kuti zvive nyore kupinda pabhodhi rezvingwa.

Mufananidzo 13. Chikamu cheSchematic chinoratidza 2.54mm I / O misoro yeQFN80 version

Debug connector

Mufananidzo 14. Chikamu cheSchematic chinoratidza sarudzo yeJST yekubatanidza yeSWD debug

Pa-chip debugging, unogona kuda kubatana neSWD interface yeRP2350. Iwo mapini maviri, SWD uye SWCLK, anowanikwa pane 2.54mm musoro, J3, kubvumira debug probe yesarudzo yako kuti ibatane nyore. Pamusoro peizvi, ini ndakasanganisira yakasarudzika JST musoro, iyo inobvumira nyore kubatana kuRaspberry Pi Debug Probe. Iwe haufanire kushandisa izvi, iyo 2.54mm misoro inokwana kana iwe uchida kugadzirisa software, asi ini ndinoona zviri nyore kuzviita. Ini ndakasarudza yakachinjika yekubatanidza, zvakanyanya nekuti ini ndinoda chitarisiko chayo, kunyangwe isiri pamucheto webhodhi, asi yakatwasuka iripo, kunyangwe iine tsoka yakati siyanei.

Mabhatani
Iyo Minimal dhizaini ikozvino haina imwe, asi mabhatani maviri, apo iyo RP240 vhezheni yaive isina. Imwe ndeyekusarudza bhutsu ye USB sezvatakambokurukura, asi yechipiri ibhatani rekuti 'reset', rakasungirirwa kuRUN pini. Hapana chimwe cheizvi chinonyatso kudiwa (kunyangwe bhatani reBOOTSEL raizofanirwa kutsiviwa nemusoro kana zvakafanana kana USB bhutsu modhi ichidikanwa), uye inogona kubviswa kana nzvimbo kana mutengo uchinetsa, asi ivo vanogadzira kushandisa RP2350 kure. chiitiko chinofadza.

Appendikisi A: Complete Schematic -RP2350A shanduro

Mufananidzo 15. Yakazara schematic yeMinimal Design yeRP2350A

Appendix B: Complete Schematic -RP2350B shanduro

Mufananidzo 16. Yakazara schematic yeMinimal Design yeRP2350B

Appendix H: Documentation Release History

Nyamavhuvhu 8 2024
Kusunungurwa kwekutanga.

uye Raspberry Pi
Raspberry Pi chiratidzo cheRaspberry Pi Ltd
Nhoroondo ye Raspberry Pi Ltd

Zvinyorwa / Zvishandiso

Raspberry Pi SC1631 Raspberry Microcontroller [pdf] Bhuku reMirayiridzo
SC1631 Raspberry Microcontroller, SC1631, Raspberry Microcontroller, Microcontroller

References

User Manual

Raspberry Pi SC1631 Raspberry Microcontroller

Mirayiridzo Yekushandiswa Kwechigadzirwa