Hello Mr. Jeff Corr,

Check the basics and I am sure you will find your problem.

First download the data sheet from the below site.
http://pdfserv.maxim-ic.com/arpdf/1733J.pdf

Confirm your hardware circuits with that on page 8, figure 3 "Typical operating circuit" and figure 4 "Equivalent input circuit".


Confirm your software with that on page 12 "Simple software interface"

Good luck,

Charles Bannister