> Their (Maxim tech. support's) response seems to imply that things would
> not work by leaving Vdd floating. However, it has worked for me for
> months, and even iButtonLink seem to be shipping sensors with Vdd
> floatin (the following comes from the manual for iButtonLink's T-Sense
> sensor
> [http://www.ibuttonlink.com/pdf/manuals%20for%20t-sense%2005-22-08.pdf]):
>
> I don't think they said that it "won't work", I think they meant "it will
only work by accident", meaning, if you rely on a floating Vdd (because it
works in current production) and they change something that causes it not to
work in future production then it's your problem, not theirs.
With high-impedance inputs left floating you are at the mercy of all kinds
of variables like humidity, dust on the circuit board, electrostatic
induction, board layout - a whole zoo of variables you can't control very
well.
iButtonLink seems to me to be saying more or less the same thing: "It SEEMS
to work with a floating Vdd - but we are not guaranteeing it." Otherwise,
they would have said, "It WILL work with a floating Vdd."
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