Going from electrolytic to ceramic for the thermistor bypass caps eliminates the cap leakage as an error source on the temp measurement. Maybe not an improvement with a 10 bit AVR ADC, but most of the ARM's I've seen have *much* better ADC's on them. As long as you derate the ceramics >= 60% for voltage they work very well. For a 10V part, that would be 4V. Works fine at 3.3. You can get away with less derating if you move up to something like an X7R dielectric. The:
[www.digikey.com]
is one possible alternative in the same package with an X7R rating. There are a multitude of other choices from other manufacturers.
[www.digikey.com]
is one possible alternative in the same package with an X7R rating. There are a multitude of other choices from other manufacturers.