Oleguer, thanks for the comment. Yes, there is definitely a limit to what ESD the chip can withstand and some can pass through the transformer, so I put "rather" before "immune".
Andrey ---- On Wed, 30 Jul 2014 02:05:22 -0700 Oleguer Nogués Correig<oleg...@gmail.com> wrote ---- > Dear all, but particularly to Andrey, > > I just would like to comment the fact that just one year ago I saw a very > similar failure in one instrument I had designed. This instrument > had an Ethernet interface, too, which was implemented with the Ethernet > interface of an Altera FPGA development board (2s60 Nios II devkit). > That board was inside a scientific instrument, custom built, and the > instrument was placed during months inside a small house at the > top of a hill, for scientific observation purposes. Seems that the > environment on that place was prone to ESD, and one day the instrument > just did not respond any more: exactly the same failure as hugo is > describing. So to summarize, I wouldn't say that "those chips are rather > immune to ESD". I would say they are actually sensible at some level, and > even though this failure might not be the most frequent, > this failure may appear specially in environments in which ESD are more > frequent, or stronger. > > > Kind regards to all, > > > Oleguer > > > > 2014-07-29 18:56 GMT+02:00 support-list <support-list@support.elphel.com>: > Hugo, I've never seen such failure before, and such chips are rather immune > to ESD, it is also connected through the transformer to the network > connector, not directly. And the failure is definitely in the chip itself, > not in the connection to the CPU. > > I did not have the replacement chip, now our contract manufacturer is > building more boards and are ordering components, we'll try to fix the board > > Andrey > ---- On Tue, 29 Jul 2014 03:19:45 -0700 hugo chauvet wrote ---- > > >Hi Oleg, > > > > > >Do you have any idea why the network chip burnt ? > >Please let us know when you send back the camera with the new network chip. > > > > > >Regards, > > > > > >Hugo. > > > > > > > >2014-07-21 23:35 GMT+02:00 Oleg <support-list@support.elphel.com>: > > Hi Hugo, > > > >Sorry, it took me to long to answer. > >Yes, we received the camera. > > The network chip on the system board doesn't work - burnt. It is possible > to replace it. > > > > > > > >Best regards, > >Oleg Dzhimiev > >Electronics Engineer > >phone: +1 801 783 5555 x124 > > Elphel, Inc. > > > > > > > > > > > > > > _______________________________________________ > >Support-list mailing list > >Support-list@support.elphel.com > >http://support.elphel.com/mailman/listinfo/support-list_support.elphel.com > > > > > _______________________________________________ > Support-list mailing list > Support-list@support.elphel.com > http://support.elphel.com/mailman/listinfo/support-list_support.elphel.com > > > > _______________________________________________ > Support-list mailing list > Support-list@support.elphel.com > http://support.elphel.com/mailman/listinfo/support-list_support.elphel.com > _______________________________________________ Support-list mailing list Support-list@support.elphel.com http://support.elphel.com/mailman/listinfo/support-list_support.elphel.com
