Am 07.11.2015 um 22:06 schrieb Colin Law:
>
> Hm, not sure. With inductive loop pickup is it not right that the
> noise is not relative to ground, but is around the loop, so it is not
> trying to get to ground, just round the loop. So I am not sure
> whether capacitance to ground is relevant.
>
The noise has a certain power which flows into these voltage sources. So
it's either high voltage at low current or high current at low voltage.
If and how much ground capacitance is relevant depends on the frequency
of the noise. R_c = 1/(2*pi*f*C), calculate for yourself. Given f=1MHz,
C=1nF, it's 160 Ohms. That's smaller than the 1.5kOhms of the pullup
resistor. The load resistance of the open circuit of a slave
(master,too) is very high for onewire, megaohms, so it doesn't matter
for the above calculation.
Kind regards
Jan
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