DS2404 has been replaced by DS2417
(http://www.maxim-ic.com/quick_view2.cfm/qv_pk/2911)
Jan Kandziora wrote on 22/4/2007 01:25:
Am Samstag, 21. April 2007 20:45 schrieb njh:
On Sat, 21 Apr 2007, Paul Alfille wrote:
The problem isn't technical -- Louis Swart does it (PIC based) in his LCD
controller.
Dallas/Maxim restricts 1-wire slaves (their patents, intellectual
property, and "quality assurance"), while making bus master design freely
available and unrestricted. I think it's a poor business decision,
limitting their market, mindshare, etc, but they seem to have the right.
I agree, this seems rather stupid (and probably explains the lack of new
products built around it).
To guarantee unique slave adresses, Dallas Semi's choice is just an obvious
one...
The DS2408 can also talk to a microprocessor a byte at a time, with a
strobe line to coordinate data transfer. We'd have to do some additions
to OWFS to support that mode, but it's quite doable.
Yes, my friend is prototyping this approach. But it's ugly, uses up 9
port pins, requires the PIC to interrupt to handle data (rather than
reading from shared memory as with the 2404) and requires another layer of
checksumming. The 2404 based approach was very elegant (although allowing
bus mastering would make it the ultimate low cost sensor/actuator
networking interface).
Ouch. The DS2404 was a useful chip for such appliances. I planned to use it in
a future design, too. I have a datasheet from last year without "Do not use
for new designs" printed over it...
I don't suppose dallas/maxim are amenable to listening to us mere
hobiests...
Not being a mere hobbyist, I'll ask at Maxim about the discontinuation of
DS2404... maybe there will be a substitute for this.
Kind regards
Jan
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