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

Industrial

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A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

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

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Design guide — TIDA-010019

TIDUEE1A.PDF (4160 K)

Reference design overview and verified performance test data

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Schematic — TIDA-010019

TIDRZC3.PDF (649 K)

Detailed schematic diagram for design layout and components

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Bill of materials (BOM) — TIDA-010019

TIDRZC4.PDF (107 K)

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

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Assembly drawing — TIDA-010019

TIDRZC5.PDF (540 K)

Detailed overview of design layout for component placement

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CAD/CAE symbol — TIDA-010019

TIDRZC7.ZIP (1712 K)

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

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Gerber file — TIDA-010019

TIDCFD4.ZIP (381 K)

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

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PCB layout — TIDA-010019

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

LMT70 — 0.1C analog temperature sensor, -5.19 mV/C, high-precision matched pairs, output enable pin

Data sheet: PDF | HTML

Analog temperature sensors

TMP235 — 1C analog temperature sensor, 10 mV/C

Data sheet: PDF | HTML

Digital isolators

ISO7721 — Robust EMC, dual-channel, 1/1, reinforced digital isolator

Data sheet: PDF | HTML

Digital temperature sensors

LMT01 — 0.5°C Accurate 2-pin Temperature Sensor with a Pulse Train Interface

Data sheet: PDF | HTML

Digital temperature sensors

TMP117 — 0.1°C digital temperature sensor, 48-bit EEPROM, PT100/PT1000 RTD replacement

Data sheet: PDF | HTML

Instrumentation amplifiers

INA317 — Micro-power (50µA), zero-drift (75µV offset, 0.3µV/˚C), precision RRO instrumentation amplifier

Data sheet: PDF | HTML

Linear & low-dropout (LDO) regulators

TPS727 — 250-mA, ultra-low-IQ, low-dropout voltage regulator with enable

Data sheet: PDF | HTML

Load switches

TPS22946 — 5.5-V, 0.15-A, 400-mΩ load switch with selectable current limit

Data sheet: PDF | HTML

MSP430 microcontrollers

MSP430FR2355 — 24-MHz 105-C integrated analog microcontroller with 32-KB FRAM, Op-Amps/PGAs, 12-bit DACs, 12-bit AD

Data sheet: PDF

Precision ADCs

ADS112U04 — 16-bit, 2-kSPS, 4-ch, low-power, small-size delta-sigma ADC w/ PGA, VREF, 2x IDACs & UART interface

Data sheet: PDF | HTML

Precision ADCs

ADS7142 — 12-bit 140-kSPS 2-ch nanopower SAR ADC with 1.8-V operation in 1.5-mm x 2-mm QFN package

Data sheet: PDF | HTML

Precision op amps (Vos<1mV)

LPV821 — 650nA, Precision Zero-Drift Nanopower Amplifier

Data sheet: PDF | HTML

Series voltage references

REF2125 — Low-drift, low-power, small-footprint series voltage reference with clean start

Data sheet: PDF | HTML

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Software

Support software

TIDCFK3 — TIDA-010019 Software

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TIDCFK3 — TIDA-010019 Software

Latest version

Version: 01.00.00.00

Release date: 23 Jul 2019

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TIDA-010019 Software (zip) — 94 K

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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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