Hi,
> I would like to ask if there are some experiences where the
> Microchip's PICmicro® microcontroller devices (PICs) are programmed to
> act (behave) as a 1-wire device (as DS2431, DS2433.... for example).
I've been experimenting on that, and although possible there are some
drawbacks.
As 1-wire master, anything is ok. the microchip creates the 'clock'
(within 1-wire specs) and reading data from the slave is easy.
However, to create a 1-wire slave, a microchip running at 4MHz
(1MHz/instruction) just isn't fast enough it seems. It can work, but
there are timing problems. The dallas 1-wire masters will create such
short pull-downs (1-2 us or so) that it is very hard for the slave to
detect. It may work, it may not, varying on conditions, cable length and
other factors, but i wasn't able to get it to work reliably. All other
stuff is pretty easy going, even like generating a serial id on first
time, or complying to the standard instruction set.
I feel that or you must pick a faster microchip, or some additional
electronics may be needed to improve the signal, which would in turn
quickly leads to using 2 i/o pins instead of one.
I am not really a elecrotechnician, more a programmer (although not
specialized in microchip), and at the time we could solve our problems
with standard-but-expensive dallas ic's.
regards,
rene
Petr Jakes wrote:
Dear group,
I think, according to the Maxim App Note 2420,
http://www.maxim-ic.com/appnotes.cfm/appnote_number/2420
such a solution can be used to control devices (motors etc.) over 1-wire
network.
Petr Jakes
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