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EVAL-CN0221-EB1Z: Thermocouple Interface

Summary

This circuit uses the ADuCM360/ADuCM361 precision analog microcontroller in an accurate thermocouple temperature monitoring application. The ADuCM360/ADuCM361 integrates dual 24-bit sigma-delta (Σ-Δ) analog-to-digital converters (ADCs), dual programmable current sources, a 12-bit digital-to-analog converter (DAC), and a 1.2 V internal reference, as well as an ARM Cortex-M3 core, 126 kB flash, 8 kB SRAM, and various digital peripherals such as UART, timers, SPIs, and I2C interfaces.

In the circuit, the ADuCM360/ADuCM361 is connected to a thermocouple and a 100 Ω platinum resistance temperature detector (RTD). The RTD is used for cold junction compensation.

In the source code, an ADC sampling rate of 4 Hz is chosen. When the ADC input programmable gain amplifier (PGA) is configured for a gain of 32, the noise-free code resolution of the ADuCM360/ ADuCM361 is greater than 18 bits.

Specifications

Manufacturer Analog Devices Inc.
Category Sensor Solutions
Sub-Category Temperature Sensing
Eval Board Part Number EVAL-CN0221-EB1Z-ND
Eval Board Supplier Analog Devices Inc.
Eval Board Normally In Stock
Purpose Thermocouple Interface
Sensing Method Thermocouple
Accuracy ±1°C
Sensing Range -200°C ~ 350°C
Features I2C Interface
SPI Interface
USB Interface
Design Author Analog Devices
Main I.C. Base Part ADuCM360
Component Count + Extras 29 + 6
Date Created By Author
Date Added To Library 2013-09

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