Dwayne,

Can I leave this pin open or do I have to tie it somewhere? I would like to be able to minimize my part count and it seems that if I don't use a resistor pulled high I get mixed results. If I tie it to the Vdd it works great. Any ideas?

Also, would the internal pull up resistors have enough umf to work for a pull up on a Dallas DS1820? Again trying to minimize part count.