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Originally Posted by unregistered
ok, the difficulty with digital pots - if I am understanding the specs:
the smallest is 10k, I'm using a 5k
the number of (programmable ?) steps is 256, yielding a resolution of 39 ohms with a 10k pot
as I presently make adjustments of several ohms, I think this may not work
even running 2 in parallel I'm still at 19 ohms
am I missing the obvious ?
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the real question is, what interface?
http://www.analog.com/IST/SelectionT...n_table_id=214
1kohm/256 steps
5kohm/256 steps
25kohm/1024 steps
will I2C or SPI interface with labview?
<edit> bigben beat me to it, and out of curiosity, are any of these compatible with the SM-Bus/SpeedFan?
<edit again> I2C and SM-BUS appear to be the same thing, would SpeedFan recgonize one of these, out of curiosity? If not, what chip can I use as a digital pot?
for billa, it looks like the 1k/256 or 5k/256 would work best, using the maxim translator chip to go from RS-232 to I2C 2-wire serial.
Everyone, correct me if wrong