Am 14.04.2014 14:44, schrieb vermus:
> vermus wrote
>> ps. Can you give a bus voltage from DS9490R ? In my case it ~ 1 Volt (3
>> and 4 pin), but AFAIK sensors on parasite power needs 3-5V...
>
> i was right..
>
> "Typically, 1-Wire slave devices operate over the voltage range of 2.8V
> (min) to 5.25V (max)."
>
> Something wrong with my DS9490R.
>
Then maybe you don't have a shorted diode in the DS9503, but a burned
series resistor in the same chip. That's a common mode of failure, too,
I had them a while ago.
This problem is usually created by connecting something to the Pin 2 GND
of the DS9490R. -> CHECK YOUR CABLING, Pin 1 and 2 of the DS9490
shouldn't be connected to anything on the bus.
Kind regards
Jan
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