Am Di 4. März 2008 schrieben Sie, Andy Green: > Hi Joerg - >[...] > Can you post about these two issues to the kernel list... > [...] I think they need consideration. > > Best to make it clear it is about ESD and there are two separate issues. > [...]
> > >>> Touchscreen is a good point, although again I think it is inherently a > >>> high impedence path. > >> > >> For GTA01: U6003 U6004 have no protection (maybe built in?) > > > > They are just bipolar transistors with base series resistor, should be > > ok. > > > > http://www.rohm.com/products/databook/tr/pdf/umd6n.pdf > > > > For GTA02 that is a worse situation :-/ they just travel direct to the > > CPU ADC input. Datasheet does not discuss characterization of these > > inputs. First of all it should be checked whether there is a shielding plane covering the outer resistor foil, which would make this a null-issue. However i don't think so, each conductive layer takes some % of transparency. TS is connected via flat ribbon? Maybe something can get spliced in there. > > > >>> GPS I will look at later, I guess there is some matching network at > >>> least between it and the chip. > >> > >> Nope, nothing in the path there, just phantom, which is L and so is > >> useless. > > > > Yes you're right, GTA02 is the same. I find the RF switch datasheet > > > > http://www.ncsd.necel.com/microwave/english/pdf/PG10218EJ01V0DS.pdf > > > > It does not discuss ESD but shows +26dBm "max input power" which is > > 400mW. I would just blow it off if we only support internal antenna but > > it is easy to imagine bad things happening with external antenna in a > > car on a hot day, etc. Hum. > As mentioned in prev posting, this might get fixed with right type of connector (make GND befor signal) jOERG
