Dnia 2009-12-01, wto o godzinie 09:59 -0300, Werner Almesberger pisze: > Patryk Benderz wrote: > > but i believe that it is wise to > > design PCB in a way, that you can apply fixes later - as history of > > GTA-02 teaches us ;) > > Heh, definitely :-) > > The issue here is that gta02-core (like GTA02) doesn't have ESD > protection on the SD/SIM holder. This is against the book, but I > think we got away with it because one will almost certainly touch > one of the grounded metal covers before reaching the SD or SIM > contacts, and thus be free from any electrostatic charge. great, after this paaragraph i understood what ESD is :) (Electro Static Discharge ?)
> Of course, we shouldn't rely on such things. So my question is > if the electrical properties of a TVS (transient voltage > suppressor) are such that we could put TSVs in lieu of the > capacitors that we already have on those lines, in case we want > to improve the ESD protection. > > If this is at least theoretically feasible, then we don't have > to worry about the issue for now and are thus one step closer to > finishing the schematics. > > (The question actually goes beyond this, because if a TVS acts > like a regular capacitor, then it would be even wrong to just > put a TVS in parallel to a capacitor without adjusting the > capacitor's value accordingly.) Definitively I am not an expert here (rather newbie), but wouldn't Zener's diode be sufficient to take this electric charges to GND? -- Patryk "LeadMan" Benderz Linux Registered User #377521 () ascii ribbon campaign - against html e-mail /\ www.asciiribbon.org - against proprietary attachments Email secured by Check Point _______________________________________________ gta02-core mailing list [email protected] https://lists.openmoko.org/mailman/listinfo/gta02-core
