TIDA-010019

RTD replacement for cold junction compensation reference design in a temperature sensor

TIDA-010019

Design files

Overview

Temperature-sensing applications that use a thermocouple (TC) require an accurate local temperature sensor to achieve high accuracy. Solutions for design challenges such as cold-junction compensation (CJC) or including an ultra-low power TC analog front-end are highlighted and addressed in this reference design. Performance in terms of power consumption and accuracy is optimized for accurate 4 to 20 mA sensors while also demonstrating the performance of different CJC and TC front-end implementations.

Features
  • Ultra-low power TC front end: < 200 µA
  • RTD type performance with silicon temperature sensors
  • 16-bit ADC for 0.05 °C resolution
  • Comparing different CJC solutions
  • TC temperature from -270 °C to 1200 °C

Design files & products

Design files

Download ready-to-use system files to speed your design process.

TIDUEE1A.PDF (4060 K)

Reference design overview and verified performance test data

TIDRZC3.PDF (649 K)

Detailed schematic diagram for design layout and components

TIDRZC4.PDF (107 K)

Complete listing of design components, reference designators, and manufacturers/part numbers

TIDRZC5.PDF (540 K)

Detailed overview of design layout for component placement

TIDRZC7.ZIP (1712 K)

Files used for 3D models or 2D drawings of IC components

TIDCFD4.ZIP (381 K)

Design file that contains information on physical board layer of design PCB

TIDRZC6.PDF (2097 K)

PCB layer plot file used for generating PCB design layout

Products

Includes TI products in the design and potential alternatives.

Analog temperature sensors

LMT700.1C analog temperature sensor, -5.19 mV/C, high-precision matched pairs, output enable pin

Data sheet document-pdfAcrobat PDF open-in-new HTML
Analog temperature sensors

TMP2351C analog temperature sensor, 10 mV/C

Data sheet document-pdfAcrobat PDF open-in-new HTML
Digital isolators

ISO7721Robust EMC, dual-channel, 1/1, reinforced digital isolator

Data sheet document-pdfAcrobat PDF open-in-new HTML
Digital temperature sensors

LMT010.5°C Accurate 2-pin Temperature Sensor with a Pulse Train Interface

Data sheet document-pdfAcrobat PDF open-in-new HTML
Digital temperature sensors

TMP1170.1C digital temperature sensor, 48-bit EEPROM, PT100/PT1000 RTD replacement

Data sheet document-pdfAcrobat PDF open-in-new HTML
Instrumentation amplifiers

INA317Micro-power (50µA), zero-drift (75µV offset, 0.3µV/˚C), precision RRO instrumentation amplifier

Data sheet document-pdfAcrobat PDF open-in-new HTML
Linear & low-dropout (LDO) regulators

TPS727250-mA, ultra-low-IQ, low-dropout voltage regulator with enable

Data sheet document-pdfAcrobat PDF open-in-new HTML
Load switches

TPS229465.5-V, 0.15-A, 400-mΩ load switch with selectable current limit

Data sheet document-pdfAcrobat PDF open-in-new HTML
MSP430 microcontrollers

MSP430FR235524-MHz 105-C integrated analog microcontroller with 32-KB FRAM, Op-Amps/PGAs, 12-bit DACs, 12-bit AD

Data sheet document-pdfAcrobat PDF open-in-new HTML
Precision ADCs (<=10MSPS)

ADS112U0416-bit, 2-kSPS, 4-ch, low-power, small-size delta-sigma ADC w/ PGA, VREF, 2x IDACs & UART interface

Data sheet document-pdfAcrobat PDF open-in-new HTML
Precision ADCs (<=10MSPS)

ADS714212-bit 140-kSPS 2-ch nanopower SAR ADC with 1.8-V operation in 1.5-mm x 2-mm QFN package

Data sheet document-pdfAcrobat PDF open-in-new HTML
Precision op amps (Vos<1mV)

LPV821650nA, Precision Zero-Drift Nanopower Amplifier

Data sheet document-pdfAcrobat PDF open-in-new HTML
Series voltage references

REF2125Low-drift, low-power, small-footprint series voltage reference with clean start

Data sheet document-pdfAcrobat PDF open-in-new HTML

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Software

Support software

TIDA-010019 Software – TIDCFK3.ZIP (94 K)

Technical documentation

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Type Title Date
* Design guide RTD Replacement for Cold Junction Compensation Reference Design (Rev. A) Sep. 13, 2019
Application note RTD Class-AA Replacement With High-Accuracy Digital Temperature Sensors in Field (Rev. A) Jul. 22, 2019

Related design resources

Reference designs

REFERENCE DESIGN
TIDA-010018 Isolated power and data interface for low-power applications reference design

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