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  • Sensor Sense: Passive Infrared-Motion Sensors
    include galliumnitride, caesium nitrate, and lithium tantalate. Skin temperature is approximately 34 C, typically higher than background temperatures. As a person walks past the sensor, their higher skin temperature creates a greater charge in the pyroelectric material. An amplifier circuit boosts
  • Oscillator Circuits For RTD Temperature Sensors
    This application note shows how to design a temperature sensor oscillator circuit using Microchip's low-cost MCP6001 operational amplifier (op amp) and the MCP6541 comparator. Oscillator circuits can be used to provide an accurate temperature measurement with a Resistive Temperature Detector (RTD
  • Temperature sensors: Thermocouples
    . Heat forces the junction to generate an electromotive force or voltage that corresponds to the temperature of the junction. Higher temperatures produce a greater EMF though the change is small. Voltage output of a typical thermocouple shifts about 50 V/ C. The types of metals used in making
  • Temperature Measurement Circuits for Embedded Applications
    This application note shows how to select a temperature sensor and conditioning circuit to maximize the measurement accuracy and simplify the interface to the microcontroller. Practical circuits and interface techniques will be provided for embedded applications with thermocouples, Resistive
  • Application Circuits of the TC620/TC621Solid-State Temperature Sensors
    The TC620/TC621are solid-state temperature sensors that are easy to program and interface with control equipment. The TC620 senses the temperature internally, while the TC621 uses an external thermistor. The TC620/TC621 data sheet (DS21439) describes how to calculate the correct resistance value
  • Analog Sensor Conditioning Circuits - An Overview
    Analog sensors produce a change in an electrical property to indicate a change in its environment. This change in electrical property needs to be conditioned by an analog circuit before conversion to digital. Further processing occurs in the digital domain but is not addresses in this application
  • Thermistors in Single Supply Temperature Sensing Circuits
    There is a variety of temperature sensors on the market all of which meet specific application needs. The most common sensors that are used to solve these application problems include the thermocouple, Resistive Temperature Detector (RTD) thermistor, and silicon-based sensors. This application note
  • IC Temperature Sensor Accuracy Compensation with a PICmicro Microcontroller
    Microchip Technology Inc. provides a number of analog and serial-output Integrated Circuit (IC) temperature sensors. The typical accuracy of these sensors at room temperature is within one degree Celsius. However, at hot or cold temperature extremes, the accuracy decreases non-linearly. Typically

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