Transcription of AN844 Simplified Thermocouple Interfaces & …
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AN844 Simplified Thermocouple Interfaces & …
AN844 . Simplified Thermocouple Interfaces and PICmicro MCUs Thermocouples come in many different types to cover Author: Joseph Julicher nearly every possible temperature application. Microchip Technology Inc. In Application Note AN684, Thermocouple basics are covered along with some circuits to measure them. This Application Note begins where AN684 leaves off INTRODUCTION. and describes methods of obtaining good accuracy Thermocouples are the simplest form of temperature with minimal analog circuitry. Also covered in this Appli- sensors. Thermocouples are normally: cation Note are: Very inexpensive Different linearization techniques Easily manufactured Cold junction compensation Effective over a wide range of temperatures Diagnostics FIGURE 1: Thermocouple CIRCUITS. Absolute Temperature Reference Scaling Gain Linearization Result Thermocouple Isothermal Barrier All Thermocouple systems share the basic characteris- Common mode range of the Op Amp.
AN844 DS00844A-page 2 2002 Microchip Technology Inc. gets higher than the effective range, either the ther-mometer is not being used correctly, or the patient
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