Olin Lathrop <olin_piclist@EMBEDINC.COM> wrote:
> ... It depends on the temperature range and desired accuracy, but a third
> order polynomial might be good enough.  That's only 5 multiplies and 3
> adds.  Add 2 multiplies and 1 add per polynomial order, so a 5th order
> polynomial is 9 multiplies and 5 adds.  A haven't worked it out, but I
> rather suspect that a 5th order polynomial will be better than other
> sources of error in the system.

A simple transformation allows polynomials to be evaluated with one
multiply and one add per order:

   A*x^3 + B*x^2 + C*x + D =
      (((A*x + B)*x + C)*x + D)

-- Dave Tweed

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