Accurately Measuring Temperature Using PSoC3/PSoC5

The PSoC Creator Component solves one part of the puzzle: converting the measured resistance accurately to temperature. The bigger part is finding the resistance accurately. AN70698 discusses the pros and cons of some circuits commonly used for measuring resistance and describes a method (shown below) where the resistance can be measured accurately using PSoC3/PSoC5 s IDAC, 20-bit delta sigma ADC and one precise external resistance.

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