MAX31912EVKIT#

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Evaluation and Demonstration Boards and Kits feature useful and practical methods to assess the behavior of an array of electrical and mechanical components and devices. Among these, MAX31912EVKIT is a demonstration board that focuses on accurately measuring the temperature. It comes with various accessories such as a thermistor, heater, JTAG cable, etc. that enable users to measure the temperature range from -55 to 125 degree Celsius with 0.2 degree accuracy. Moreover, along with the board, MAXIM also provides temperature levels calculator, which can help users to verify readings, design system, demonstrate ICs and troubleshoot its use.

The MAX31912EVKIT# features RTD/Thermistor Averaging Circuit and is configured with an active load to measure the power dissipation across a thermistor. It allows users to have a direct insight into a real-world scenario, as the evaluation board can be powered in different ways, viz. using USB or AC wall adapter. The kit also includes an optional heater, which helps in offsetting the temperature difference between the probe and air temperature.

The MAX31912EVKIT# is a versatile evaluation system, providing different options that can be used to simulate a wide variety of conditions. Its features and components provide flexibility to quickly and precisely measure the change of temperature in different applications. Below is the description of the working principle of the MAX31912EVKIT# and its application field.

Working Principle

The MAX31912EVKIT# works on the principle of RTD or thermistor averaging circuit. The circuit is based on two MAX31890 RTD-to-digital converters, MAX31725 low-dropout (LDO) voltage regulator, low-noise operational amplifiers (OPAMPs) and a low-noise current-to voltage converter. This evaluation system can measure the temperature levels of a wide temperature range, typically from –55 to +125 °C, with an accuracy of 0.2 °C. The step-by-step explanation of the working principle of the MAX31912EVKIT# is as follows:

• The MAX31890 RTD-to-Digital Converters are used to measure the resistance of the RTD sensors.
• The low-noise OPAMPs are used to amplify the voltage signals that are generated.
• The MAX31725 low-dropout voltage regulator is used to provide voltage regulation for the amplifiers, while the current-to-voltage converter is used to convert the current signals into voltage signals.
• The data generated from this process is then amplified and fed to the MAX31890 RTD-to-Digital Converter.
• Finally, the data from the MAX31890 RTD-to-Digital Converter is then used to calculate the temperature levels.

Application Field

The MAX31912EVKIT# is a versatile evaluation system and can be used for a wide variety of applications. The reason for its versatility is it’s two independent channels that can be used simultaneously to measure the temperature ranger from -55 to 125 degree Celsius. This makes it ideal for applications such as thermometer calibration, temperature compensation, data acquisition, and environmental monitoring.

The MAX31912EVKIT# is also useful in systems where high accuracy temperature measurements are required, such as in medical grade thermometers, air conditioners, automotive engines, HVAC systems, and refrigerators. The evaluation system also finds use in research laboratories and educational institutions to verify readings and demos, or to design systems, troubleshoot issues, and carry out various experiments.

In conclusion, the MAX31912EVKIT# is an effective and reliable tool for accurately measuring temperatures in a wide temperature range, with a 0.2 degree accuracy. Its active load feature enables users to measure the power dissipation across a thermistor. Moreover, its wide application scope makes it a versatile tool for all kinds of high accuracy temperature measurement-based applications.

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