Mhinduro dzeKugadzira dzeUSB-C dzemhando yepamusoro

USB-C inotakura data re40 Gbps, inopa simba re240 W, uye inotaurirana nezvemaitiro e24 pins pa 0.5 mm pitch — zvese zvinodzoreka. Kuisa USB-C paPCB pasina kutadza kushanda zvakanaka kwesignali, matambudziko ekupa simba, kana matambudziko eEMC kunoda mitemo chaiyo yekurongeka, maseketi ekudzivirira, uye kushivirira kwekugadzira izvo gwara iri rinonyora pin-by-pin.

Zviri Mukati

1. Mepu yePin yeUSB-C: Zvinodiwa neBoka Rimwe Nerimwe kubva kuPCB
2. Nzira Yekusiyanisa Yepamusoro-soro: Impedance, Kufananidza Kureba uye Strategy yeLayer
3. Kuendeswa kweMagetsi eVBUS: Saizi yemhangura kubva pa15 W kusvika 240 W
4. Kugadziriswa kweCC Pin kweSource, Sink uye Dual-Role Ports
5. Maseketi ekudzivirira: ESD, EMI uye Kugara Kwemakanika
6. Kugadzira uye Kugadzira maPCB eUSB-C

1. Mepu yePin yeUSB-C: Zvinodiwa neBoka rega rega kubva kuPCB

Kurongeka kwemapini makumi maviri nemana kwakaenzana (12 padivi) kunogonesa kudzoserwa kwemapulagi asi kunowedzera kaviri huwandu hwePCB routing density. Maseti ese eTX1/RX1 neTX2/RX2 enzira anofanira kudzoserwa — USB-C controller inoona plug orientation kuburikidza nemapini eCC uye inoita kuti lane set ishande nemazvo. Kune madhizaini eUSB 2.0 chete, pair imwe chete yeD+/D− inoda full routing; imwe yacho inopfupikiswa pa connector pad.

Kukwira kwepad kwe0.5 mm kunoda kugadzirwa kwePCB kwakanyatsojeka. Kubviswa kwepad kubva papad kuenda papad kuri 0.15–0.2 mm chete — pasi pekugona kwemaitiro akawanda ekugadzira PCB. Kukwanisa kweHDI PCB ine 3 mil trace/nzvimbo kunodiwa kuti USB-C fanout yakachena ive yakakora mumagadzirirwo e multi-layer.

2. SuperSpeed ​​​​Differential Routing: Impedance, Length Matching uye Layer Strategy

Pa 10 Gbps (USB 3.2 Gen 2), peya yega yega inochinja-chinja iRF transmission line. Mitemo yekuisa inoshanda pa USB 2.0 inokundikana pa SuperSpeed.

Kuvharirwa: 90 Ω musiyano, ±5% ye USB 3.x, ±3% ye USB4. Pa FR-4 ine 4 mil prepreg: ~0.18 mm trace width, ~0.18 mm gap. Aya mavalues ​​anofanira kuverengerwa ne stackup chaiyo yemugadziri — usakope mavalues ​​kubva kune chimwe chinhu kana ukobvu hwakasiyana.

Kufananidza hurefu: Intra-pair (zvisaririra zviviri zvepeya imwe): ≤5 mil yeUSB 3.x, ≤2 mil yeUSB4. Shandisa serpentine tuning yakapfava, kwete tight zigzags — makona akapinza anogadzira impedance bumps pamulti-GHz frequency.

Maitiro ekuisa zvinhu: Nzira dzekubatanidza zvinhu zveSuperSpeed ​​pazvikamu zvemukati zvakaiswa pakati peGND planes (stripline) kuti zvidzivirire zvakanyanya. Zvikamu zveUSB 2.0 zvinogona kufamba pazvikamu zvekunze. Zvikamu zvitanhatu zveUSB 3.2 Gen 2; zvikamu zvisere zveUSB4. Pamabhodhi ane zvikamu zvina, SuperSpeed ​​​​inofamba pazvikamu zvekunze se microstrip — zvinogamuchirwa paUSB 3.0 (5 Gbps) asi hazvikurudzirwi kupfuura kumhanya ikoko.

Vias: Via imwe neimwe paSuperSpeed ​​​​pair inowedzera ~0.2–0.5 nH inductance uye inogadzira stub inoshatisa dhayagiramu yeziso. Tarisa shanduko dze zero layer pa pair imwe neimwe. Kana shanduko isingadzivisike, isa GND stitching vias mukati me1 mm uye funga nezve back-drill isina kushandiswa kuburikidza ne stubs dzemagadzirirwo eUSB4. Kune maPCB anoda back-drilling, ona gwara redu re tekinoroji ye back-drilling.

Macapacitor ekubatanidza eAC: Mitsetse yeUSB 3.x TX inoda macaps ekubatanidza eAC e100 nF (0402 kana 0201). Aise zvakaenzana pakati pematraces maviri epeya imwe neimwe, pedyo nedivi retransmitter, nehurefu hushoma hwestub.

3. Kuendeswa kweMagetsi eVBUS: Saizi yemhangura kubva pa15 W kusvika 240 W

USB-C VBUS ine 5 V (yakajairika), 9 V, 15 V, 20 V (USB PD 3.0, kusvika ku100 W), kana 28 V / 36 V / 48 V (USB PD 3.1 Extended Power Range, kusvika ku240 W). PCB copper inofanira kubata magetsi akaipisisa pamagetsi akabvumiranwa.

Mapini ese mana eVBUS anofanira kubatana pamwe chete paPCB (zvakafanana neGND) — chivharo chinodzoserwa, saka mativi ese ane simba. Kune magadzirirwo e100 W+, VBUS plane yakatsaurirwa pane imwe jira remukati ndiyo yakajairika. PCB yemhangura ine 2 oz yemukati inotsigira 240 W PD isina kukwira zvakanyanya kwekushisa.

Dziviriro: OVP (dziviriro yemagetsi akawanda) uye OCP (dziviriro yemagetsi akawanda) zvinowanzobatanidzwa mu USB PD controller IC (TI TPS65987, Cypress CYPD3177, Infineon CYPD6227). MaTV ekunze ari paVBUS anobata ma surge transients anopfuura kugona kwe controller.

4. CC Pin Configuration yeSource, Sink uye Dual-Role Ports

CC1 neCC2 inyanzvi dzeUSB-C. Dzinoona kuiswa kwetambo, dzinoona kurongeka kweplug, dzinoona basa rekunobva/kunyura, uye dzinogadzirisa voltage yePD nemagetsi. Magadzirirwo ePCB anoenderana nebasa remudziyo:

Sinki (simba rinogashira mudziyo): Pini yega yega yeCC inodhonzwa kuGND kuburikidza ne5.1 kΩ Rd resistor. Zviratidzo "Ndiri mudziyo, ndipei simba." Kune masinki anokwanisa PD, PD controller inoshanda inotsiva resistor uye inobata kutaurirana kwemashoko ePD kuburikidza neBMC encoding pamutsetse weCC.

Kwakabva (mudziyo unopa simba): Pini yega yega yeCC yakadhonzwa kuVCONN kana 3.3 V kuburikidza neRp resistor. Rp value inozivisa kugona kwemagetsi: 56 kΩ = USB yakajairika (500 mA), 22 kΩ = 1.5 A, 10 kΩ = 3 A. Kune PD sources, active controller inotsiva Rp uye inotaurirana nezve voltage/current contracts.

Dual-Role Port (DRP): Inochinjana pakati peRp neRd, ichiskena mumwe. PD controller inobata muchina weDRP state, Try.SRC/Try.SNK logic, uye PR_Swap (power role swap). DRP inoshandiswa mumalaptop, USB-C hubs, uye docking stations dzinogona kuwana uye kudonhedza simba.

Kurongeka kwePCB: chengeta maCC traces ari pasi pe50 mm kuderedza capacitance. Wedzera 0.1 µF connector kuGND pedyo nechinobatanidza. Nzira yeCC traces iri kure neSuperSpeed ​​​​differential pairs — BMC signaling paCC inogona kusanganiswa mumigwagwa yekumhanya kwepamusoro kana nzvimbo isina kukwana.

Pazvigadzirwa zvinoshandisa DisplayPort kana Thunderbolt Alt Mode, mapini eSBU1/SBU2 sideband anobatanidzwa kune Alt Mode controller. Izvi zvinoda dziviriro yeESD asi hapana kudzorwa kweimpedance.

5. Maseketi ekudzivirira: ESD, EMI uye Kugara Kwemakanika

Kurongeka kwekuchengetedzwa kweESD (connector → hub IC):

1. MaTVS diode arrays paSuperSpeed ​​TX/RX — ≤0.3 pF (TI TPD4S214, Diodes Inc DT1452-02)
2. TVS paD+/D− — ≤3 pF (TI TPD4S012, Nexperia PESD5V0U4BF)
3. TVS paVBUS — mbiri, yakayerwa voltage yePD (Bourns CDSOT23-SM712)
4. TVS paCC neSBU — inowanzo batanidzwa muPD controller

Zvinhu zvese zveESD zviri mukati me1.5 mm kubva pamapini ekubatanidza. Uyu mutemo usingachinjiki — mudziyo wekudzivirira unoshanda chete kana ukabata pulse yeESD usati wasvika kuIC yekutonga.

Kudzivirira EMI: Kudzikira kwemaitiro akafanana paSuperSpeed ​​​​pairs (Murata DLW32SH yeUSB 3.0, TDK ACT45B yeUSB 2.0). Chidziviriro chekubatanidza chakasungirirwa kuGND kuburikidza nema-vis ekusona akawanda ari mukati me2 mm kubva pama-shell pads. Kune zvigadzirwa zvine chekuita nezvinodiwa zvekurapa, zvemotokari, kana zvemauto EMC, matekiniki ekugadzira PCB ane frequency yakakwira anosanganisira ma-shielding planes uye ma-vis anodzorwa-impedance anoshandiswa.

Kuvimbika kwemuchina: USB-C yakayerwa kuti iite ma "insertion cycles" zviuru gumi. Ma "connectors" anoiswa pamusoro ane ma "holding tabs" anobatirira (rudzi rwakajairika) anopa simba rakakwana remuchina. Ma "connectors" eSMT akachena haana kusimba — anogamuchirwa kune zvigadzirwa zvisingachinji, haatakurike. Ma "connectors" epakati (akaiswa mukati mebhodhi) anokodzera michina yakatetepa zvakanyanya asi anoda nzira chaiyo yeCNC yekuronga bhodhi.

6. Kugadzira uye Kugadzira maPCB eUSB-C

MaPCB eUSB-C anoda kushivirira kwakasimba pakugadzirwa kupfuura mabhodhi akajairwa. Simbisa kugona uku nemugadziri wako usati wapedzisa kugadzira:

Nzvimbo/nzvimbo: 3 mil / 3 mil zvishoma kune nzvimbo dze USB-C fanout. 5 mil / 5 mil yakajairika haina kukwana kune ma 0.5 mm pitch contact pads.

Kudzora Impedance: ±5% pa 90 Ω differential ye USB 3.x; ±3% ye USB4. Inoda field-solver simulation pakugadzira chaiko uye TDR coupon verification pa batch yega yega. Kugadzirwa kweImpedance-controlled kuHighleap kunotsigira kushivirira uku pa FR-4 uye laminates dzisina kurasikirwa zvakanyanya.

Kupera kwepamusoro: ENIG (goridhe risina electro nickel/immersion gold) ndiyo yakajairika pakushandisa USB-C pad soldering — nzvimbo yakati sandara inopa solder paste dense pad array. Kupera kwepamusoro kweENIG negoridhe rakarongwa kunoita kuti connector ibatanidzwe zvakanaka mukati mehupenyu hwese hwechigadzirwa.

Kubatanidza: Chinobatanidza cheUSB-C chine ma signal pads makumi maviri nemana pamwe nema shield/mounting pads mana pa 0.5 mm pitch. Dhizaini ye stencil aperture ye solder paste yakakosha — over-deposit inokonzera mabhiriji; pasi-deposit inokonzera kuvhurika. Vanoshanda pamwe chete ne USB-C vane ruzivo rwekugadzira vanoshandisa stencil aperture reductions chaiyo (kazhinji 80–90% yenzvimbo ye pad) yakasimbiswa pama test boards vasati vagadzira.

Highleap Electronics inogadzira maUSB-C PCB ane mativi mana kusvika gumi nemaviri ane HDI. Tumira dhizaini yako yeUSB-C PCB kuti uwane mutengo.

Zvakafanana: Gwaro rekugadzira PCB re USB hub · Sarudzo yevagadziri vePCB ye USB hub · Zvigadzirwa zve USB converter · Gwaro re USB port expander