如何對觸摸屏進行靜電ESD浪涌保護?怎么選用ESD二極管?
當觸(chu)控(kong)(kong)面(mian)板表面(mian)的靜(jing)(jing)電(dian)(dian)電(dian)(dian)壓與內部感(gan)測電(dian)(dian)容元(yuan)件的壓差(cha)超過臨界(jie)電(dian)(dian)場時(shi),靜(jing)(jing)電(dian)(dian)電(dian)(dian)流就有(you)機(ji)會(hui)由感(gan)測元(yuan)件流進(jin)控(kong)(kong)制(zhi)(Control)IC,在實際(ji)產(chan)(chan)品(pin)的驗證(zheng)中,時(shi)常會(hui)發現感(gan)測元(yuan)件的故障燒毀或感(gan)測控(kong)(kong)制(zhi)IC的接收I/O故障。因此,在設計觸(chu)摸屏產(chan)(chan)品(pin)過程中,靜(jing)(jing)電(dian)(dian)放電(dian)(dian)浪(lang)涌保護(hu)措(cuo)施必不可(ke)少。針對觸(chu)摸屏靜(jing)(jing)電(dian)(dian)浪(lang)涌問題,東(dong)(dong)沃電(dian)(dian)子(DOWOSEMI)技(ji)術推(tui)薦選(xuan)用ESD二極管DW05-4R2P-S和DW05DF-BN-E做防護(hu) 。東(dong)(dong)沃觸(chu)摸屏靜(jing)(jing)電(dian)(dian)浪(lang)涌保護(hu)方案設計圖如(ru)下所示(shi):