On 1/25/2012 13:24, p4trykx wrote:
Dnia 25-01-2012 o 19:11:08 Roberto Spadim<robe...@spadim.com.br>
napisał(a):
well, i don´t think we will have another solution instead of with more
bus masters instead of more hubs
In a discussion on Maxim site, someone mentions a substitute made from
other components
http://www.maxim-ic.com/datasheet/index.mvp/id/2909/t/uc
"As far as the application note describing the replacement... It's not
really worth waiting for, I've seen the preliminary version. It basically
uses a DS2408, two resistors, a DS1811, and two unspecified analog
switching chips; and then they add insult to injury by pointing out that
the builtin ESD protection of the 2409 has not been covered yet and needs
to be taken care of by separate components."
Maxim's circuit was an attempt to maintain compatibility with the one
wire command set. I took a look and it seemed not worth the trouble.
A much better analog switch could be used for this function and would
lend itself to more than 2 channels. Perhaps some consideration might
be given to owfs supporting a custom command for a new/proposed hardware
device that would implement a hub? If this is possible, I could work up
something on the bench, although it would undoubtedly be more costly
than using the now gone 2409. And if this can work, maybe a
multi-channel 32 bit counter is another opportunity?
/m
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