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Make accurate temperature measurements using semiconductor junctions

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re: Make accurate temperature measurements using semiconductor junctions
DadOf3TeenieBoppers   7/12/2012 6:07:45 PM
Accuracy is not the greatest in the world, but at least one would have a ballpark figure +/- 2% to 3%) of the core temperature of a processor or FPGA with a temperature sensing diode built in. This way an alarm can be raised as the temperature begins to rise into the area where the lifespan of an IC begins to drop off dramatically.

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re: Make accurate temperature measurements using semiconductor junctions
SPLatMan   6/28/2012 7:14:49 AM
Switching between two currents, rather than using 2 (hopefully matched) transistors at different currents, is a neat trick in these days of microprocessors. I will keep it in mind. That said, this method would really only be economical if the design already contains a high resolution ADC. If you only have a 10 or 12-bit ADC as is usually included in a microcontroller chip, then a $0.25 thermistor plus a fixed resistor is a better bet. Even cheap (1%) thermistors have an accuracy of about 1'F (rule of thumb: 1'F/% @25'C) and a 10 bit ADC will give a resolution of way less than a degree. The downside is that the processor will have to do some linearisation.

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