Kufufuza zamkuwa kufalikira mu PCB

Ngati pali malo ambiri a PCB, SGND, AGND, GND, ndi zina zambiri, amafunika kugwiritsa ntchito malo ofunikira kwambiri potengera kopanda mkuwa molingana ndi bolodi la PCB, ndiye kuti, kulumikiza nthaka pamodzi.

Pali zifukwa zingapo zoyikira mkuwa wonse. 1, EMC. Kwa gawo lalikulu la nthaka kapena magetsi okhala ndi mkuwa, izichita gawo loteteza, ena apadera, monga PGND amatenga gawo loteteza.

2. PCB ndondomeko zofunika. Nthawi zambiri, pofuna kuonetsetsa zotsatira electroplating, kapena palibe mapindikidwe a lamination, kwa gulu PCB ndi zochepa Kulumikizana wosanjikiza mkuwa.

3, zikwangwani zofunikira pakukhulupirika, perekani siginecha yayitali kwambiri njira yobwerera, ndikuchepetsa kulumikizana kwa ma netiweki a dc. Zachidziwikire, pali kutaya kwanyengo, zida zofunikira zapadera zama shopu zamkuwa ndi zina zotero. Pali zifukwa zingapo zoyikira mkuwa wonse.

1, EMC. Kwa gawo lalikulu la nthaka kapena magetsi kufalitsa mkuwa, izichita gawo loteteza, ena apadera, monga PGND amatenga gawo loteteza.

2. PCB ndondomeko zofunika. Nthawi zambiri, pofuna kuonetsetsa zotsatira electroplating, kapena palibe mapindikidwe a lamination, kwa gulu PCB ndi zochepa Kulumikizana wosanjikiza mkuwa.

3, zikwangwani zofunikira pakukhulupirika, kuzizindikiro za digito pafupipafupi njira yobwerera, ndikuchepetsa kulumikizana kwa netiweki ya DC. Zachidziwikire, pali kutaya kwanyengo, zida zofunikira zapadera zama shopu zamkuwa ndi zina zotero.

Sitolo, mwayi waukulu wamkuwa ndikuchepetsa kuchepa kwa nthaka (panali gawo lalikulu la zomwe zimadziwika kuti anti-jamming ndikuchepetsa kuyimitsidwa kwapansi) kozungulira digito kulipo pakatikati pazomwe zimachitika, potero amachepetsa nthaka impedance ndiyofunikira kwambiri kwa ena, amakhulupirira kuti gawo lonse lopangidwa ndi zida zamagetsi liyenera kukhala lalikulu pansi, pamagawo a analog, Mzere wapansi wopangidwa ndikuyika mkuwa umapangitsa kusokonekera kwamagetsi kwamagetsi (kupatula ma circuits apamwamba). Chifukwa chake, si ma circuits onse omwe amafunikira mkuwa wapadziko lonse (BTW: magwiridwe antchito amkuwa amtundu wabwino kuposa bwalo lonse)

Chachiwiri, kufunikira kwa dera loyala mkuwa kuli: 1, kuyika waya wamkuwa ndi nthaka kumalumikizidwa palimodzi, kuti titha kuchepetsa dera lachigawo 2, kufalitsa dera lalikulu lamkuwa lofananira kuti lichepetse kukana kwa nthaka, kuchepetsa kutsika kwakanthawi pama mfundo awiriwa, ziwerengero zonse, kapena kuyerekezera kuyenera kukhala Kuyika mkuwa kuti iwonjezere kuthekera kwa anti-kusokoneza, ndipo panthawi yamafupipafupi iyeneranso kufalitsa nthaka yawo ya digito ndi analogi kuti ipatule mkuwa, ndiye kuti amalumikizidwa ndi mfundo imodzi, Mfundo imodzi imatha kulumikizidwa ndi bala la waya mozungulira maginito kangapo. Komabe, ngati mafupipafupi sali okwera kwambiri, kapena momwe magwiridwe antchito sakuyipa, amatha kukhala omasuka. The oscillator galasi amachita monga chopatsilira mkulu-pafupipafupi mu dera la. Mutha kuyala mkuwa mozungulira ndikuyika chipolopolo cha kristalo, chomwe chili chabwino.

Kodi pali kusiyana kotani pakati pa bolodi lonse lamkuwa ndi gululi? Makamaka pofufuza za mitundu itatu yazotsatira: 3 kukongola 1 phokoso lochepetsera 2 kuti muchepetse kusokonekera kwapafupipafupi (m’chigawo chazifukwa) molingana ndiupangiri wa zingwe: mphamvu ndi mapangidwe momwe zingathere chifukwa chowonjezera grid ah siili ndi mfundo sizikugwirizana nayo? Ngati kuchokera pamawonekedwe ambiri, sizolondola pakulumikiza kwa waya pafupipafupi pomwe taboo yayikulu ndiyolumikizana, pamagetsi osanjikiza ali ndi madigiri opitilira 90 ndimavuto ambiri. Chifukwa chomwe mumapangira izi ndi ntchito yamanja: yang’anani pazitsulo zopangidwa ndi manja ndikuwona ngati zajambulidwa motero. Mukuwona zojambulazi ndipo ndikutsimikiza kuti panali chip pa icho chifukwa panali njira yotchedwa wave soldering mukamaiyika ndipo amatenthetsa bolodi kwanuko ndipo ngati mungaziike zonse mumkuwa ma coefficients mbali zonse ziwiri zinali zosiyana ndipo bolodi limalumikizana kenako vuto limabuka, Pachikuto chachitsulo (chomwe chimafunikanso pochita izi), ndikosavuta kwambiri kulakwitsa pa PIN ya chip, ndipo kukanidwa kukwera molunjika. M’malo mwake, njirayi ilinso ndi zovuta zake: Potengera dzimbiri lathu: Ndikosavuta kuti kanemayo amangiriremo, ndiyeno mu projekiti ya asidi, mfundoyi singawonongeke, ndipo pali zinyalala zambiri, koma ngati zilipo, ndi bolodi lomwe lathyoledwa ndipo ndi chip chomwe chimatsikira ndi bolodi! Kuchokera pano, kodi mukuwona chifukwa chake zidapangidwa motere? Zachidziwikire, palinso phala patebulo lopanda gridi, kuchokera pakuwona kusasinthasintha kwa malonda, pakhoza kukhala zochitika ziwiri: 2, njira yake ya dzimbiri ndiyabwino kwambiri; 2. M’malo mozungulira soldering, amatenga chowotchera chamoto chotsogola kwambiri, koma pakadali pano, kusungitsa ndalama pamsonkhano wonse kudzakhala kopitilira 3-5.