This circuit provides a low cost solution to temperature monitoring because most of the circuit functionality is integrated into the ADuCM360 precision analog microcontroller, including dual 24-bit Σ-Δ ADCs, the ARM Cortex™-M3 processor core, and the PWM/DAC features for controlling the 4 mA-to-20 mA loop for loop voltages up to 28V.
The ADuCM360 is connected to a Type T thermocouple and a 100 Ω platinum resistance temperature detector (RTD). The RTD is used for cold junction compensation. The low power Cortex-M3 core converts the ADC readings to a temperature value. The Type T thermocouple temperature range supported is −200°C to +350°C, and this temperature range is converted to an output current range of 4 mA to 20 mA.
This circuit is similar to the circuit in Circuit Note CN-0300 with the additional benefit of the higher resolution of the PWM driving the 4 mA-to-20 mA loop. The PWM-based output provides 14 bits of resolution. For details on the temperature sensor interface to the ADC and on linearization techniques for the RTD measurements, see Circuit Note CN-0300 and the AN-0970 Application Note.
| Manufacturer | Analog Devices Inc. |
|---|---|
| Category | Sensor Solutions |
| Sub-Category | Temperature Sensing |
| Eval Board Part Number | EVAL-CN0319-EB1Z-ND |
| Eval Board Supplier | Analog Devices Inc. |
| Eval Board |
Normally In Stock
|
| Purpose |
Thermocouple Interface
|
| Sensing Method |
Thermocouple
|
| Accuracy |
±0.5°C
|
| Sensing Range |
-200°C ~ 350°C
|
| Features |
ARM Cortex-M3 MCU
HART Interface USB Interface Voltage Reference |
| Design Author |
Analog Devices
|
| Main I.C. Base Part |
ADuCM360
|
| Component Count + Extras |
50 + 3
|
| Date Created By Author | 2013-05 |
| Date Added To Library | 2014-06 |
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