{"id":4647,"date":"2026-01-20T06:03:03","date_gmt":"2026-01-20T06:03:03","guid":{"rendered":"https:\/\/flj-pcb.com\/?p=4647"},"modified":"2026-01-20T06:17:12","modified_gmt":"2026-01-20T06:17:12","slug":"hdi-pcb-design-essential-optimization-guide","status":"publish","type":"post","link":"https:\/\/flj-pcb.com\/fi\/hdi-pcb-design-essential-optimization-guide\/","title":{"rendered":"HDI PCB Design: Optimointiopas: Olennainen optimointiopas"},"content":{"rendered":"

Suunnittelu HDI-piirilevy (High-Density Interconnect) PCB<\/a> edellytt\u00e4\u00e4 syv\u00e4llist\u00e4 ymm\u00e4rryst\u00e4 sek\u00e4 s\u00e4hk\u00f6teknisist\u00e4 tarpeista ett\u00e4 valmistuksen rajoituksista. HDI-tekniikka mahdollistaa useampien komponenttien sijoittamisen pienemp\u00e4\u00e4n tilaan. T\u00e4m\u00e4n vuoksi se on paras valinta nykyaikaiseen elektroniikkaan, kuten \u00e4lypuhelimiin ja puettavaan teknologiaan.<\/p>\n\n\n\n

Seuraavassa on yksityiskohtainen opas tekij\u00f6ist\u00e4, jotka sinun on otettava huomioon, ja siit\u00e4, miten voit optimoida HDI-suunnitelmasi.<\/p>\n\n\n\n

\n\n\n\n

HDI PCB-suunnittelun aikana huomioon otettavat tekij\u00e4t<\/h2>\n\n\n\n

1. \u00c4lyk\u00e4s komponenttien valinta<\/h3>\n\n\n\n

Kun suunnittelet HDI-piirilevy\u00e4, ty\u00f6skentelet yleens\u00e4 hyvin pienten osien kanssa. N\u00e4ihin kuuluvat pinta-asennettavat laitteet (SMD) ja palloverkkojoukot (BGA), joiden jako on $0.65\\text{ mm}$ tai v\u00e4hemm\u00e4n.<\/p>\n\n\n\n

Sinun on valittava komponentit huolellisesti. Nastojen v\u00e4linen et\u00e4isyys (jako) on t\u00e4rkein tekij\u00e4. Jos nastat ovat hyvin l\u00e4hell\u00e4 toisiaan, sinulla on v\u00e4hemm\u00e4n tilaa kuparij\u00e4ljille. T\u00e4m\u00e4 valinta kertoo my\u00f6s, mink\u00e4laista j\u00e4ljen leveytt\u00e4 tarvitset ja mink\u00e4laista viaa (reik\u00e4\u00e4) sinun on k\u00e4ytett\u00e4v\u00e4. Jos valitset BGA:n, jossa on hyvin pieni jako, saatat joutua k\u00e4ytt\u00e4m\u00e4\u00e4n useampia kerroksia tai pienempi\u00e4 mikrovioita kaikkien signaalien yhdist\u00e4miseen.<\/p>\n\n\n\n

2. Mikroviasien k\u00e4ytt\u00f6<\/h3>\n\n\n\n

Mikroviat ovat HDI-suunnittelun syd\u00e4n. Ne ovat hyvin pieni\u00e4 reiki\u00e4, joiden halkaisija on yleens\u00e4 alle $0,15\\text{ mm}$. Suunnittelijat k\u00e4ytt\u00e4v\u00e4t usein \u201cbuild-up\u201d tai \u201cper\u00e4kk\u00e4isi\u00e4\u201d laminointitekniikoita n\u00e4iden reikien luomiseksi.<\/p>\n\n\n\n

Mikroviat auttavat s\u00e4\u00e4st\u00e4m\u00e4\u00e4n paljon tilaa. Koska ne ovat niin pieni\u00e4, niit\u00e4 mahtuu enemm\u00e4n pienelle alueelle kuin perinteisi\u00e4 l\u00e4pivientireiki\u00e4. Toinen suuri etu on niiden alhainen induktanssi. Sen ansiosta ne sopivat erinomaisesti nopeisiin piireihin. Voit k\u00e4ytt\u00e4\u00e4 niit\u00e4 tehotasojen yhdist\u00e4miseen purkauskondensaattoreihin tai miss\u00e4 tahansa paikassa, jossa s\u00e4hk\u00f6ist\u00e4 kohinaa on v\u00e4hennett\u00e4v\u00e4.<\/p>\n\n\n\n

3. Materiaalin valinta<\/h3>\n\n\n\n

Oikean materiaalin valinta on elint\u00e4rke\u00e4\u00e4 kaikille piirilevyille, mutta se on viel\u00e4 t\u00e4rke\u00e4mp\u00e4\u00e4 HDI:lle. Tavoitteena on l\u00f6yt\u00e4\u00e4 materiaali, joka on helppo valmistaa mutta joka my\u00f6s kest\u00e4\u00e4 hyvin l\u00e4mp\u00f6\u00e4 ja s\u00e4hk\u00f6\u00e4.<\/p>\n\n\n\n

Materiaalin fyysinen paksuus on keskeinen tekij\u00e4. Sinun on tarkasteltava mikroviasien \u201ckuvasuhdetta\u201d. T\u00e4m\u00e4 on rei\u00e4n syvyyden ja halkaisijan suhde. Jos materiaali on liian paksua ja reik\u00e4 liian pieni, reik\u00e4\u00e4 on hyvin vaikea levytt\u00e4\u00e4 kuparilla kunnolla. Sinun on valittava materiaali, joka sallii kemikaalien virrata reikien l\u00e4pi pinnoitusprosessin aikana.<\/p>\n\n\n\n

4. Via Capping ja Offset Microvias<\/h3>\n\n\n\n

HDI-suunnittelussa voit k\u00e4ytt\u00e4\u00e4 tekniikkaa nimelt\u00e4 \u201cvia-in-pad\u201d. T\u00e4m\u00e4 tarkoittaa sit\u00e4, ett\u00e4 mikrovia sijoitetaan suoraan pintaliitosalustan keskelle.<\/p>\n\n\n\n

T\u00e4t\u00e4 varten l\u00e4pivienti on \u201cpeitett\u00e4v\u00e4\u201d tai t\u00e4ytett\u00e4v\u00e4 ja p\u00e4\u00e4llystett\u00e4v\u00e4 kuparilla. T\u00e4m\u00e4 luo tasaisen pinnan juottamista varten. T\u00e4t\u00e4 menetelm\u00e4\u00e4 k\u00e4ytt\u00e4m\u00e4ll\u00e4 saat paljon enemm\u00e4n tilaa reititt\u00e4\u00e4 j\u00e4lki\u00e4, koska l\u00e4pivienti ei vie ylim\u00e4\u00e4r\u00e4ist\u00e4 tilaa padin ulkopuolelta. Voit my\u00f6s k\u00e4ytt\u00e4\u00e4 \u201coffset\u201d-mikroverkkoja, joissa eri kerroksissa olevat rei\u00e4t eiv\u00e4t ole t\u00e4ysin samassa linjassa, jotta tilaa voidaan hallita viel\u00e4 paremmin.<\/p>\n\n\n\n

\"v\"<\/figure>\n\n\n\n

5. V\u00e4hennetyt tasol\u00e4vistykset<\/h3>\n\n\n\n

Kun suunnitellaan teho- ja maatasot alle BGA<\/a>, haluat mahdollisimman paljon kiinte\u00e4\u00e4 kuparia. T\u00e4t\u00e4 kutsutaan nimell\u00e4 \u201cPower Integrity\u201d (PI).<\/p>\n\n\n\n

Perinteisiss\u00e4 malleissa suuret l\u00e4pivientirei\u00e4t luovat kuparitasoihin monia \u201ctyhji\u00e4\u201d tai tyhji\u00e4 kohtia. T\u00e4m\u00e4 toimii kuin aita, joka est\u00e4\u00e4 virran kulun. HDI:ss\u00e4 l\u00e4piviennit ovat paljon pienempi\u00e4, joten kuparia j\u00e4\u00e4 enemm\u00e4n koskemattomaksi. T\u00e4m\u00e4 parantaa levyn s\u00e4hk\u00f6magneettista yhteensopivuutta (EMC). Se tarjoaa my\u00f6s paremman suojan h\u00e4iri\u00f6it\u00e4 vastaan.<\/p>\n\n\n\n

6. Stack-up- ja delaminaatiokysymykset<\/h3>\n\n\n\n

\u201cPinoaminen\u201d on kupari- ja eristekerrosten j\u00e4rjestely. HDI:ss\u00e4 k\u00e4ytet\u00e4\u00e4n usein eri materiaaleja eri kerroksissa.<\/p>\n\n\n\n

Jokaisella materiaalilla on l\u00e4mp\u00f6laajenemiskerroin (CTE). T\u00e4m\u00e4 kertoo, kuinka paljon materiaali kasvaa kuumentuessaan. Jos kahdella kerroksella on hyvin erilaiset CTE-arvot, ne laajenevat eri nopeudella. T\u00e4m\u00e4 voi aiheuttaa kerrosten irtoamisen toisistaan, mit\u00e4 kutsutaan \u201cdelaminaatioksi\u201d. T\u00e4m\u00e4n v\u00e4ltt\u00e4miseksi suunnittelijoiden tulisi pyrki\u00e4 k\u00e4ytt\u00e4m\u00e4\u00e4n samaa materiaalia jokaisessa kerroksessa tai k\u00e4ytt\u00e4\u00e4 materiaaleja, joiden CTE-arvot ja kosteuden imeytymisnopeudet ovat hyvin samanlaiset.<\/p>\n\n\n\n

\"HDI<\/figure>\n\n\n\n

7. Testausmenetelm\u00e4t<\/h3>\n\n\n\n

Perinteinen \u201cpiirin sis\u00e4inen testaus\u201d (ICT) ei useinkaan ole mahdollista HDI-levyjen osalta. ICT vaatii suuria testipisteit\u00e4, jotka viev\u00e4t liikaa tilaa.<\/p>\n\n\n\n

Sen sijaan suunnittelijat k\u00e4ytt\u00e4v\u00e4t toiminnallista testausta tai JTAG-menetelmi\u00e4 (Joint Test Action Group). JTAG-menetelm\u00e4n avulla voit testata integroitujen piirien v\u00e4lisi\u00e4 yhteyksi\u00e4 ilman, ett\u00e4 tarvitset fyysisi\u00e4 testikoettimia jokaista johtoa varten. Vaikka ICT on eritt\u00e4in hyv\u00e4 tiettyjen vikojen l\u00f6yt\u00e4misess\u00e4, JTAG soveltuu paljon paremmin HDI-piirilevyn tihe\u00e4\u00e4n ymp\u00e4rist\u00f6\u00f6n.<\/p>\n\n\n\n

\"JTAG<\/figure>\n\n\n\n

8. L\u00e4mm\u00f6nhallinta<\/h3>\n\n\n\n

HDI-levyt ovat hyvin tiheit\u00e4, joten ne kuumenevat nopeasti. Sinun on suunniteltava, miten l\u00e4mp\u00f6 siirret\u00e4\u00e4n pois komponenteista.<\/p>\n\n\n\n

Sinun tulisi noudattaa IPC-2226<\/a> standardi, joka sis\u00e4lt\u00e4\u00e4 s\u00e4\u00e4nn\u00f6t HDI:n l\u00e4mp\u00f6suunnittelua varten. Yksi HDI:n eduista on, ett\u00e4 dielektriset (eristys)kerrokset ovat hyvin ohuita. Ohuet kerrokset yhdess\u00e4 mikroviolettien kanssa auttavat itse asiassa johtamaan l\u00e4mp\u00f6\u00e4 pois siruista. Jos komponentti on eritt\u00e4in kuuma, voit lis\u00e4t\u00e4 \u201cl\u00e4mp\u00f6l\u00e4pivientej\u00e4\u201d siirt\u00e4m\u00e4\u00e4n l\u00e4mm\u00f6n suurempaan kuparitasoon tai j\u00e4\u00e4hdytyselementtiin.<\/p>\n\n\n\n

9. Reititysvaatimus vs. substraattikapasiteetti<\/h3>\n\n\n\n

\u201cReititystarve\u201d on kaikkien niiden johtojen kokonaispituus, joita tarvitaan piirilevyn osien yhdist\u00e4miseen. \u201cSubstraattikapasiteetti\u201d on johtojen kokonaispituus, joka mahtuu levylle.<\/p>\n\n\n\n

Onnistuneen suunnittelun edellytyksen\u00e4 on, ett\u00e4 kapasiteetin on oltava suurempi kuin kysynt\u00e4. Jos kysynt\u00e4 on liian suuri, saatat joutua lis\u00e4\u00e4m\u00e4\u00e4n kerroksia, mutta t\u00e4m\u00e4 lis\u00e4\u00e4 kustannuksia. Suunnittelijat pyrkiv\u00e4t tasapainottamaan n\u00e4m\u00e4 kaksi asiaa, jotta suunnittelu saadaan valmiiksi mahdollisimman pienin kustannuksin.<\/p>\n\n\n\n

10. PWB-tiheyden laskeminen<\/h3>\n\n\n\n

Voit mitata, kuinka monimutkainen suunnittelusi on, laskemalla PWB-tiheyden (Printed Wiring Board). Mittaamme t\u00e4m\u00e4n j\u00e4lkien keskim\u00e4\u00e4r\u00e4isen\u00e4 pituutena neli\u00f6tuumaa kohti.<\/p>\n\n\n\n

T\u00e4m\u00e4n selvitt\u00e4miseksi oletetaan, ett\u00e4 jokaisella \u201cverkolla\u201d (yksitt\u00e4inen s\u00e4hk\u00f6inen yhteys) on kolme solmua ja ett\u00e4 jokainen komponentin johto on yksi solmu. K\u00e4yt\u00e4mme seuraavaa kaavaa:<\/p>\n\n\n\n

$$Wd = \\beta \\sqrt{Cd \\times Cc}$$$<\/p>\n\n\n\n

Miss\u00e4:<\/p>\n\n\n\n

    \n
  • $Wd$<\/strong>: PWB-tiheys (keskim\u00e4\u00e4r\u00e4inen j\u00e4ljen pituus neli\u00f6tuumaa kohti).<\/li>\n\n\n\n
  • $Cd$<\/strong>: Komponentin tiheys (keskim\u00e4\u00e4r\u00e4inen m\u00e4\u00e4r\u00e4 osia neli\u00f6tuumaa kohti).<\/li>\n\n\n\n
  • $Cc$<\/strong>: Komponentin monimutkaisuus (johtojen\/nippien keskim\u00e4\u00e4r\u00e4inen m\u00e4\u00e4r\u00e4 osaa kohti).<\/li>\n\n\n\n
  • $\\beta$<\/strong>: Piirin tyyppiin perustuva vakio.\n
      \n
    • K\u00e4yt\u00e4 2.5<\/strong> korkea-analogisille tai erillisille alueille.<\/li>\n\n\n\n
    • K\u00e4yt\u00e4 3.0<\/strong> analogisten ja digitaalisten alueiden sekoittamiseen.<\/li>\n\n\n\n
    • K\u00e4yt\u00e4 3.5<\/strong> puhtaasti digitaalisia tai ASIC-alueita varten.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n

      T\u00e4m\u00e4 kaava on hy\u00f6dyllinen opas. Muista kuitenkin, ett\u00e4 jokainen muotoilu on ainutlaatuinen, eik\u00e4 ole olemassa yht\u00e4 ainoaa s\u00e4\u00e4nt\u00f6\u00e4, joka sopisi kaikille laudoille.<\/p>\n\n\n\n

      \n\n\n\n

      Kuinka optimoida HDI-suunnittelu elektroniikkaa varten?<\/h2>\n\n\n\n

      HDI on piirilevyteollisuuden nopeimmin kasvava osa. Se tekee piirilevyist\u00e4 tehokkaampia ja mahdollistaa nopeammat signaalinopeudet. Tavallisiin levyihin verrattuna HDI-levyiss\u00e4 on paljon ohuempia viivoja, pienempi\u00e4 v\u00e4lej\u00e4 ja pienempi\u00e4 tyynyj\u00e4. Suurin ero on siin\u00e4, miten kerrokset liittyv\u00e4t toisiinsa. Tavallisissa levyiss\u00e4 k\u00e4ytet\u00e4\u00e4n reiki\u00e4, jotka menev\u00e4t koko matkan l\u00e4pi, mutta HDI-levyiss\u00e4 k\u00e4ytet\u00e4\u00e4n sokeita ja upotettuja l\u00e4pivientej\u00e4.<\/p>\n\n\n\n

      Seuraavassa on useita tapoja optimoida suunnittelu ja v\u00e4ltt\u00e4\u00e4 kalliita virheit\u00e4.<\/p>\n\n\n\n

      Valitse oikea Via-tyyppi<\/h3>\n\n\n\n

      Valitsemasi l\u00e4piviennit muuttavat levyn suorituskyky\u00e4 ja kustannuksia. Mikroviasien (sokeiden tai upotettujen) k\u00e4ytt\u00f6 voi itse asiassa v\u00e4hent\u00e4\u00e4 tarvittavien kerrosten kokonaism\u00e4\u00e4r\u00e4\u00e4. Kun kerroksia on v\u00e4hemm\u00e4n, materiaalikustannukset laskevat. Se tekee my\u00f6s valmistusprosessista v\u00e4hemm\u00e4n monimutkaisen. Sinun kannattaa keskustella valmistajan kanssa varhaisessa vaiheessa, jotta n\u00e4et, mink\u00e4laisia l\u00e4pivientityyppej\u00e4 he voivat valmistaa luotettavasti.<\/p>\n\n\n\n

      \"PCB<\/figure>\n\n\n\n

      Valitse komponentit huolellisesti<\/h3>\n\n\n\n

      Kun rakennat HDI-piirilevy\u00e4, sinun on oltava hyvin varovainen valitsemiesi osien suhteen. Ennen kuin aloitat asettelun, katso osien nastam\u00e4\u00e4r\u00e4 ja koko. Mieti, miten j\u00e4ljet mahtuvat nastojen v\u00e4liin. Jos valitset piirilevyn kokoon n\u00e4hden liian monimutkaisia osia, suunnitteluun kuluu enemm\u00e4n aikaa ja valmistukseen enemm\u00e4n rahaa.<\/p>\n\n\n\n

      Suunnittele pinoaminen huolellisesti<\/h3>\n\n\n\n

      HDI-levyn kerrokset voidaan j\u00e4rjest\u00e4\u00e4 monella tavalla. Yleisi\u00e4 tapoja ovat mm:<\/p>\n\n\n\n

        \n
      • 1-HDI:<\/strong> Yl\u00e4- ja alapuolella on yksi kerros mikrovias-kokoja, ja ydin sis\u00e4lt\u00e4\u00e4 upotettuja vias-kokoja.<\/li>\n\n\n\n
      • 2-HDI (pinoamaton):<\/strong> Kaksi kerrosta mikroviiri\u00e4, jotka eiv\u00e4t istu p\u00e4\u00e4llekk\u00e4in.<\/li>\n\n\n\n
      • Pinottu 2-HDI:<\/strong> Mikroviat, jotka istuvat suoraan toistensa p\u00e4\u00e4ll\u00e4. N\u00e4m\u00e4 voidaan t\u00e4ytt\u00e4\u00e4 hartsilla tai kuparilla.<\/li>\n<\/ul>\n\n\n\n

        Sinun on valittava tasapainoinen pino. Jos pino ei ole symmetrinen, levy saattaa v\u00e4\u00e4nty\u00e4 tai taipua l\u00e4mmitysprosessin aikana. Hyv\u00e4 pinoaminen parantaa \u201csaantoa\u201d (valmistettujen hyvien levyjen prosenttiosuutta).<\/p>\n\n\n\n

        K\u00e4yt\u00e4 oikeaa v\u00e4limatkaa<\/h3>\n\n\n\n

        Jos laitat komponentit liian l\u00e4helle toisiaan, saatat aiheuttaa s\u00e4hk\u00f6magneettisia h\u00e4iri\u00f6it\u00e4 (EMI). T\u00e4m\u00e4 tapahtuu, kun yhden johdon s\u00e4hk\u00f6iset signaalit vuotavat toiseen johtoon. Se voi my\u00f6s aiheuttaa \u201cloiskapasitanssia\u201d, joka hidastaa signaaleja.<\/p>\n\n\n\n

        Komponentit on sijoitettava niin, ett\u00e4 stressi ja s\u00e4hk\u00f6magneettinen h\u00e4iri\u00f6 ovat mahdollisimman v\u00e4h\u00e4iset. Varmista samalla, ett\u00e4 kokoonpanoa ja korjausta varten on riitt\u00e4v\u00e4sti tilaa. Jos osat ovat liian l\u00e4hell\u00e4 toisiaan, niit\u00e4 on hyvin vaikea juottaa tai korjata, jos jokin menee pieleen.<\/p>\n\n\n\n

        Keskittyminen signaalin eheyteen (SI)<\/h3>\n\n\n\n

        Signaalin eheys tarkoittaa sen varmistamista, ett\u00e4 s\u00e4hk\u00f6inen signaali pysyy puhtaana johdon toisesta p\u00e4\u00e4st\u00e4 toiseen. Jotta signaalit pysyv\u00e4t vahvoina:<\/p>\n\n\n\n

          \n
        • Pid\u00e4 l\u00e4pivientien \u201ckuvasuhde\u201d oikeana, jotta kuparipinnoitus on paksu ja tasainen.<\/li>\n\n\n\n
        • K\u00e4yt\u00e4 hyvin pieni\u00e4 mikrovias-kuvioita v\u00e4hent\u00e4m\u00e4\u00e4n \u201ctyng\u00e4n\u201d pituutta (ylim\u00e4\u00e4r\u00e4inen kupari, joka roikkuu j\u00e4ljest\u00e4).<\/li>\n\n\n\n
        • Sijoita pienet osat l\u00e4helle toisiaan, jotta signaalireitit pysyv\u00e4t lyhyin\u00e4.<\/li>\n\n\n\n
        • Levit\u00e4 haudatut ja sokeat l\u00e4piviennit levymateriaaleihin kohdistuvan fyysisen rasituksen v\u00e4hent\u00e4miseksi.<\/li>\n<\/ul>\n\n\n\n

          K\u00e4yt\u00e4 kehittyneit\u00e4 suunnitteluty\u00f6kaluja<\/h3>\n\n\n\n

          HDI-piirilevyn suunnittelu on liian vaikeaa perusohjelmistolle. Valmistajat ja suunnittelijat tarvitsevat ammattimaisia CAD- (tietokoneavusteinen suunnittelu) ja CAM- (tietokoneavusteinen valmistus) ohjelmistoja. He k\u00e4ytt\u00e4v\u00e4t my\u00f6s \u201cLaser Direct Imaging\u201d (LDI) -menetelm\u00e4\u00e4 pienten viivojen piirt\u00e4miseen piirilevylle. Koska toleranssit ovat niin pieni\u00e4, k\u00e4ytt\u00e4j\u00e4n kokemus on yht\u00e4 t\u00e4rke\u00e4\u00e4 kuin koneetkin.<\/p>\n\n\n\n

          Hy\u00f6dyt eri toimialoilla<\/h3>\n\n\n\n

          HDI-levyj\u00e4 k\u00e4ytet\u00e4\u00e4n, koska ne parantavat elektroniikan suorituskyky\u00e4. L\u00f6yd\u00e4t niit\u00e4 seuraavista paikoista:<\/p>\n\n\n\n

            \n
          • Tietokoneet:<\/strong> Nopeampi tietojenk\u00e4sittely.<\/li>\n\n\n\n
          • \u00c4lypuhelimet:<\/strong> Mahdollistaa enemm\u00e4n ominaisuuksia taskukokoiseen laitteeseen.<\/li>\n\n\n\n
          • L\u00e4\u00e4kinn\u00e4lliset laitteet:<\/strong> tehd\u00e4 laitteista pienempi\u00e4 ja kannettavampia l\u00e4\u00e4k\u00e4reille.<\/li>\n<\/ul>\n\n\n\n

            HDI-projektin onnistuminen riippuu siit\u00e4, miten hyvin suunnittelet asettelun ja miten hyvin teet yhteisty\u00f6t\u00e4 valmistajan kanssa. Seuraamalla n\u00e4it\u00e4 vinkkej\u00e4 voit luoda suorituskykyisen piirilevyn, joka on sek\u00e4 luotettava ett\u00e4 kustannustehokas.<\/p>","protected":false},"excerpt":{"rendered":"

            Designing a High-Density Interconnect (HDI) PCB requires a deep understanding of both electrical needs and manufacturing limits. HDI technology allows 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