Using Kinetis K53 Amplifiers for Connecting Thermocouple and Thermistor Devices

[#1]

This application note provides guidelines on Kinetis K53 family for using the internal Operational Amplifiers (OPAMP), Transimpedance Amplifiers (TRIAMP), and the Analog-to-Digital Converter (ADC) modules to measure the temperature through a thermocouple and a thermistor and the result is shown on a LCD display using the LCD Controller (LCD) module. All these modules are available on the K53 MCU.

The application uses different OPAMP configurations, such as internal gain and external gain using external resistor. TWR-K53N512 board was used as base hardware for performing this application.

Watch the Freescale Kinetis K53 family in action. The internal Operational Amplifiers (OPAMP), Transimpedance Amplifiers (TRIAMP), and the Analog-to-Digital Converter (ADC) modules are used to measure the temperature through a thermocouple and a thermistor. The result is shown on a LCD display using the LCD Controller (LCD).

Get the full Application Note

[rabbit]

It is a good application for this MCU, two questions:

1. For Thermocouple, have you test the temperature below -100 Degree?
2. Compare with 24 Bit A/D converter, no amplifier is required to do Thermocouple measurement. There is an internal OPAMP0 in this MCU, how stable is it vs temperature?

Regards

Sam

[kev1504]

Hi,

Does anybody know where the file "thermistor_thermocouple.c", mentioned in the guide, is on the freescale homepage?

They say it is somwhere there but I do not find it.

Cheers,

Kevin