ESD应用指南

广州周立功单片机发展有限公司配套教材TM01010101V0.99Date:2010/04/16《深入浅出CortexM0——LPC1100系列》teachingmateriali广州周立功单片机发展有限公司Tel：(020)3873097638730977Fax：[phone]创建文档若对教材有任何疑问或建议，请联系[e-mail]。ii广州周立功单片机发展有限公司Tel：(020)3873097638730977Fax：[phone]销售与服务网络（一）广州周立功单片机发展有限公司地址：广州市天河北路689号光大银行大厦12楼F4邮编：510630电话：(020)3873091638730917387309723873097638730977传真：[phone]网址：广州专卖店地址：广州市天河区新赛格电子城203-204室电话：(020)8757863487569917传真：[phone]南京周立功地址：南京市珠江路280号珠江大厦2006室电话：(025)836132218361327183603500传真：[phone]北京周立功地址：北京市海淀区知春路113号银网中心A座1207-1208室（中发电子市场斜对面）电话：(010)625361786253617982628073传真：[phone]重庆周立功地址：重庆市石桥铺科园一路二号大西洋国际大厦（赛格电子市场）1611室电话：(023)6879643868796439传真：[phone]杭州周立功地址：杭州市天目山路217号江南电子大厦502室电话：(0571)897194808971948189719482897194838971948489719485传真：[phone]成都周立功地址：成都市一环路南二段1号数码同人港401室（磨子桥立交西北角）电话：(028)8543983685437446传真：[phone]深圳周立功地址：深圳市深南中路2070号电子科技大厦C座4楼D室电话：[phone]（5线）传真：[phone]武汉周立功地址：武汉市洪山区广埠屯珞瑜路158号12128室（华中电脑数码市场）电话：(027)871684978716829787168397传真：[phone]上海周立功地址：上海市北京东路668号科技京城东座7E室电话：(021)530834525308345353083496传真：[phone]西安办事处地址：西安市长安北路54号太平洋大厦1201室电话：(029)878812968306300087881295传真：[phone]iii广州周立功单片机发展有限公司Tel：(020)3873097638730977Fax：[phone]销售与服务网络（二）广州致远电子有限公司地址：广州市天河区车陂路黄洲工业区3栋2楼邮编：510660传真：[phone]网址：（嵌入式系统事业部）（工控网络事业部）（楼宇自动化事业部）技术支持：CAN-bus：电话：(020)226443812264438222644253邮箱：[e-mail]及数据采集：电话：(020)2887234422644373邮箱：[e-mail]：电话：(020)2887268428872347邮箱：[e-mail]以太网：电话：(020)2264438022644385邮箱：[e-mail]无线通讯：电话：[phone]邮箱：[e-mail]串行通讯：电话：(020)2826780022644385邮箱：[e-mail]编程器：电话：[phone]邮箱：[e-mail]分析仪器：电话：(020)226443752887262428872345邮箱：[e-mail]嵌入式系统：电话：(020)226443832264438428267813邮箱：[e-mail]@zlgmcu.com楼宇自动化：电话：(020)226443762264438928267806邮箱：[e-mail]@zlgmcu.com销售：电话：(020)22644249226443992264437222644261288725242887234228872349288725692887257338601786维修：电话：[phone]iv广州周立功单片机发展有限公司Tel：(020)3873097638730977Fax：[phone]章接口技术与可靠性设计······················································································14.1ESD应用指南················································································································14.1.1概述························································································································14.1.2ESD基础知识········································································································11．ESD简介·············································································································12．静电的危害··········································································································13．ESD的发生原理·································································································24．ESD危害的产生和作用机理··············································································25．ESD保护器件的意义··························································································24.1.3ESD保护器件介绍································································································31．器件分类·············································································································32．ESD保护器件的重要参数··················································································63．NXP半导体的ESD保护器件············································································94.1.4ESD保护器件选型······························································································111．选型方法············································································································112．选型举例···········································································································12v广州周立功单片机发展有限公司Tel：(020)3873097638730977Fax：[phone]的基础知识及其危害，并且提出了使用ESD保护器件的解决方案。为了便于用户学习使用ESD保护器件，本文对ESD保护器件的重要参数、分类、选型方法和应用都作了全面介绍。3.1.2ESD基础知识1．ESD简介静电是一种自然现象，产生的方式有多种，如接触、摩擦等。静电的特点是高电压、低电量、小电流和作用时间短。静电在日常生活中是无处不在的。人体自身的动作或与其它物体的接触、分离、摩擦或感应等因素，可以让人体上产生几千伏甚至上万伏的静电。例如，当我们走过化纤的地毯，可产生大约35000伏的静电；翻阅塑料说明书则可产生大约7000伏的静电。ESD是Electro-Staticdischarge的缩写，即“静电放电”的意思。在干燥的天气里，当我们去接触另外一个人的时候，有时会有触电的感觉；当在黑暗处脱下身上穿的化纤毛衣时，有时会看到耀眼的电火花。这些都是静电放电现象，见图3.1。ESD冲击脉冲的带宽很宽、上升时间很短且峰值能量很大。图3.1ESD现象国际上还习惯将用于静电防护的器材统称为“ESD”，这类器件在国内常被称呼为ESD电路保护器件或静电阻抗器等。2．静电的危害静电会对一些敏感仪器造成致命破坏，并在多个领域造成严重危害：许多开发人员都遇到过这样的情况：在实验室开发好的产品，测试完全通过，但到了客户手里用了一段时间之后就出现异常现象甚至是彻底失效，故障率却往往不高（1%以下）。以上问题，其实就可能是由于器件被静电损坏了；静电还可在不经意间将昂贵的电子器件击穿，造成电子工业年损失达上百亿美元；在宇航工业，静电放电造成火箭和卫星发射失败，干扰宇航飞行器的运行；1967年7月29日，美国Forrestal航空母舰上发生严重事故，一架A4飞机上的导弹突然点火，造成了7200万美元的损失，并损伤了134人，调查结果是导弹屏蔽接头不合格，静电引起了点火；1969年底，在不到一个月的时间内，荷兰、挪威、英国三艘20万吨超级油轮洗舱时