uhm... nice, but.. you have a isolated the serial line (ADUM1402)
what about the power supply? why don´t isolate it too? try a MINMAX MAU202,
it have everything inside, if you know other isolated dc/dc converter let
us know about it too :) minmax is very hard to find here, i buy it only
from international farnell site
about the erros check the statistic values from you bus master at owfs
system, maybe it´s a short circuit at onewire bus, or another know error
2011/12/2 Eloy Paris <pe...@chapus.net>
> Hi p4trykx,
>
> On 12/01/2011 07:40 PM, p4trykx wrote:
>
> > Hello
> > I recently build a dual 1-wire adapter based on two DS2480B chips. It is
> > also isolated with Analog Devices ADUM2402(or similar) isolator. It's
> > connected to my Asus WL-500W 2 serial ports. The uart header has also
> > +3.3V and this powers the router side of ADUM2402.
> > I'm not an educated electronics engineer I would like to hear opinions
> > about the board layout and schematics.
> > I built one board with toner thermal transfer method and it works more
> > or less fine. However I sometimes get 85* errors. Previously I used
> > ds-2480B with ft232RL serial<->usb adapter and there where no 85*
> > errors. The difference between two setups is that the new adapter has 62
> > Ohm resistor and the old one does not. I also didn't solder the 470pF
> > capacitor because I didn't have the particular value(I will go to the
> > shop tomorrow).
> >
> > http://imageshack.us/photo/my-images/685/schem.png/
>
> Good job; you seem like a pretty good engineer to me ;-) And soldering
> those SMT components is probably not an easy task.
>
> I notice that the RC filter seems to be inverted, i.e. the capacitor is
> connected to the 1-Wire bus instead of to pin 2 of the DS2480B. Right
> now you don't have a capacitor but when you put it in I think you should
> connect it to pin 2 of the 2480B.
>
> I don't see why you are getting the 85 degrees errors. Are the sensors
> working in parasitic mode? If so, are the Vdd pins grounded?
>
> Cheers,
>
> Eloy Paris.-
>
>
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Spadim Technology / SPAEmpresarial
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