Reading DS1620 (SPI Temperature) from 18F46k22 Micro at 16MHz

[Dave]

Jim, When you have the logic analyzer connected to the PIC pins, are you seeing consistent data between transfers meaning reading to reading? 15 feet is quite a ways for an un-buffered SPI bus. The DS1620 device shouldn't be changing temperature that drastically.

[JimAvanti]

Dave,
from one reading to the next, the data does look consistent, but the temp is off which seems weird. I have been logging the results and they are smooth changes in temp. I think it will be a bit easier to follow what is going on with the logic analyzer if I remove the fahrenheit conversion and compare the data read to the bits on the analyzer, but that will be for another day since I don't have the analyzer set up next to where the device is mounted. Maybe then I will be able to see if I am dropping a bit someplace. I may try a different type of Temp IC also (Maybe one that also does humidity)

Jim, When you have the logic analyzer connected to the PIC pins, are you seeing consistent data between transfers meaning reading to reading? 15 feet is quite a ways for an un-buffered SPI bus. The DS1620 device shouldn't be changing temperature that drastically.