Hi,

I am currently designing a temperature sensor using a 16C54 and the
AN512.
This involves charging a capacitor via two resistors consecutively and
then using the
measured time to calculate one of them. As mentioned in the application
note I am
using the RTCC pin for triggering.
For testing I use a fixed resistor instead of the temperature sensor. So
I should get
always the same result. But this is unfourtunately not the case. The
result differs by
a few counts. I don't why that happens. Could it by caused by noise?

Does anybody have experience with this method?

Ralf Patz