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.- ------------------------------------------------------------------------------ All the data continuously generated in your IT infrastructure contains a definitive record of customers, application performance, security threats, fraudulent activity, and more. Splunk takes this data and makes sense of it. IT sense. And common sense. http://p.sf.net/sfu/splunk-novd2d _______________________________________________ Owfs-developers mailing list Owfs-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/owfs-developers
