ESD Generation thiab Hazards
Electrostatic Discharge (ESD) tshwm sim thaum ob yam khoom sib tsoo lossis sib cais. ESD yog qhov txav ntawm cov nqi hluav taws xob los ntawm ib qho khoom mus rau lwm qhov ntawm ob yam khoom uas muaj peev xwm sib txawv, zoo ib yam li xob laim me me. Qhov loj thiab ntev ntawm qhov tso tawm yog nyob ntawm ntau yam, nrog rau hom khoom thiab ib puag ncig ib puag ncig. Thaum ESD muaj zog txaus, nws tuaj yeem ua rau cov khoom siv hluav taws xob puas. ESD tuaj yeem tshwm sim txhua lub sijhawm, xws li thaum ntsaws lossis tshem cov cables, thaum ib tus neeg kov I / O chaw nres nkoj ntawm lub cuab yeej, thaum lub tshuab hluav taws xob tau kov cov khoom siv hluav taws xob, thaum cov khoom siv semiconductor kov hauv av, lossis thaum electrostatic teb thiab electromagnetic cuam tshuam, uas ua rau muaj hluav taws xob txaus txaus uas ua rau ESD.
ESD tuaj yeem muab faib ua peb hom: ESD tshwm sim los ntawm ntau lub tshuab, ESD tshwm sim los ntawm kev txav rooj tog lossis khoom siv, thiab ESD tshwm sim los ntawm tib neeg kev sib cuag lossis cov khoom txav. Tag nrho peb hom ESD yog qhov tseem ceeb rau kev tsim cov khoom siv semiconductor thiab cov khoom siv hluav taws xob. Cov khoom siv hluav taws xob feem ntau raug kev puas tsuaj los ntawm hom thib peb ntawm ESD thaum siv, nrog cov khoom siv hluav taws xob uas siv tau yooj yim tshwj xeeb rau ESD tshwm sim los ntawm tib neeg kev sib cuag. ESD feem ntau ua kev puas tsuaj rau cov khoom siv sib txuas. Xwb, cov khoom siv uas raug rau ESD yuav tsis poob tam sim ntawd tab sis muaj kev ua haujlwm tsis zoo, ua rau cov khoom tsis ua tiav ntxov. Thaum ib qho kev sib xyaw ua ke (IC) raug rau ESD, qhov kev tawm tsam ntawm cov hluav taws xob tawm feem ntau qis heev, tsis tuaj yeem txwv qhov tawm tam sim no. Piv txwv li, thaum ib qho hluav taws xob zoo li qub - them cable txuas rau hauv Circuit Court interface, qhov kev tawm tsam ntawm qhov hluav taws xob hluav taws xob yuav luag xoom, ua rau lub sijhawm tam sim no tawm mus txog li kaum tawm amperes. Qhov tam sim no loj tam sim no ntws mus rau hauv cov sib txuas IC pins tuaj yeem ua rau IC puas tsuaj loj; lub tshav kub hauv zos tuaj yeem yaj cov silicon tuag.
ESD kev puas tsuaj rau ICs feem ntau kuj suav nrog kev kub nyhiab ntawm kev sib txuas ntawm cov hlau sab hauv, kev puas tsuaj rau txheej txheej passivation, thiab hlawv tawm ntawm transistor hlwb. ESD tseem tuaj yeem ua rau IC latch- nce. Cov nyhuv no zoo ib yam li cov khoom siv hauv CMOS, qhov twg cov thyristor cov qauv siv tau qhib. High voltage tuaj yeem qhib cov qauv no, tsim txoj hauv kev loj tam sim no, feem ntau ntawm VCC mus rau hauv av. Lub latch- txog tam sim no ntawm serial interface li yuav siab li 1 ampere. Lub latch- tam sim no yuav nyob twj ywm kom txog thaum lub cuab yeej de-energized. Txawm li cas los xij, los ntawm lub sijhawm ntawd, IC feem ntau twb hlawv tawm vim overheating. Ob qhov teeb meem yuav tshwm sim tom qab qhov cuam tshuam ESD uas tsis yooj yim pom. Cov teeb meem no feem ntau tsis pom los ntawm cov neeg siv dav dav thiab cov koom haum kuaj IEC siv cov lus pom zoo ib txwm muaj thiab cov txheej txheem ntxig.