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Thermistor Temperature Sensing with MCP6S2X PGA

From Microchip Technology, Inc.
 

 
This application note shows two circuits that use a precise, negative temperature coefficient (NTC) thermistor for temperature measurement. The thermistor is placed in a resistive divider to linearize the voltage response to temperature. This voltage is then processed in the analog domain, by the MCP6S2X Programmable Gain Amplifier (PGA), before converting to digital. The first circuit uses a more precise Analog-to-Digital Converter (ADC), while the second circuit employs a less precise ADC. The design tradeoffs between these approaches will be discussed. These circuits take advantage of the MCP6S2X's input MUX, which have 1, 2, 6 or 8 inputs. This PGA is used to process multiple signals and/or temperatures, and digitally set the most appropriate gain for each input. This reduces overall design complexity and allows for the temperature correction of other sensors.
Product Announcements
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Topics of Interest
This application note shows two designs that use a precise, negative temperature coefficient (NTC) thermistor for temperature measurement. The thermistor is placed in a resistive divider to linearize... (Read More)
Resistive sensors configured as Wheatstone bridges are primarily used to sense pressure, temperature or loads. An external A/D converter (ADC) and a digitally Programmable Gain Amplifier (PGA) can... (Read More)
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... (Read More)
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... (Read More)
Thermistor can be classified into 2 category, PTC thermistor and NTC thermistor, according to its resistance-temperature characteristics. PTC, abbreviation of Positive Temperature Coefficient. NTC,... (Read More)