There are many ways you can run into ESD problems but I were to guess I'd say you have a ground bounce problem. That usually happens when the discharge path is the same as the signal path. If possible have a perimeter ground connected to chassis and another ground for your signal back to the power supply. Try not to let paths run parallel. Even if they are not electrically connected you still get cross talk.
Fred Townsend [email protected] wrote: >Hello group, > >I am involved in design of a small printer and one of the problems that I am facing is the ESD failure on my I/O ports. Both USB and Parallel. The problem is contact discharge and at 4KV. I pass 3KV but when I go to 4, it fails. Can anyone give me some design guideline or recommendation that I need to follow? I greatly appreciate it. > >Thanks >Peter > >---------------------------------------------------------------- >This message is from the IEEE Product Safety Engineering Society >emc-pstc discussion list. Website: http://www.ieee-pses.org/ > >To post a message to the list, send your e-mail to [email protected] > >Instructions: http://listserv.ieee.org/listserv/request/user-guide.html > >List rules: http://www.ieee-pses.org/listrules.html > >For help, send mail to the list administrators: > > Scott Douglas [email protected] > Mike Cantwell [email protected] > >For policy questions, send mail to: > > Richard Nute: [email protected] > Jim Bacher: [email protected] > >All emc-pstc postings are archived and searchable on the web at: > > http://www.ieeecommunities.org/emc-pstc > > > > This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to [email protected] Instructions: http://listserv.ieee.org/listserv/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas [email protected] Mike Cantwell [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
