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TIDA-00168

Thermocouple AFE Using RTD or Integrated Temperature Sensor for Cold Junction Compensation (CJC)

Design files

TIDA-00168

Design files

Overview

The sole objective of this reference design is to provide comprehensive details on how to design a simple, robust, and accurate analog front end (AFE) circuit for making precision temperature measurements with thermocouple sensors. TIDA-00168 explains the theory, operation, and complications involved in a step-by-step manner. Additionally, this reference design emphasizes topics like error analysis, the necessity of an anti-aliasing filter, biasing resistors for sensor diagnostics, CJC, linearization technique for sensor data, and the design challenges of printed circuit boards.

Features
  •  Sensor input: K-Type thermocouple
  •  Thermocouple Temperature range of –200°C to 1372°C
  •  Noise free resolution: 0.02ºC
  •  Cold Junction Compensation (CJC) using
  •  Resistance Temperature Detector (RTD) or the internal temperature sensor of the ADS1220
  •  Designed to meet IEC61000-4 Standards:
    • Electrical Fast Transients (EFTs), Electrostatic Discharge (ESD), and Surge
    • Field Transmitter operating temperature range of –40°C to 85°C
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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.

download Design guide — TIDA-00168
TIDU574.PDF (10770 K)

Reference design overview and verified performance test data

download Schematic — TIDA-00168
TIDRBW6.PDF (559 K)

Detailed schematic diagram for design layout and components

download Bill of materials (BOM) — TIDA-00168
TIDRBW7.PDF (196 K)

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

download Assembly drawing — TIDA-00168
TIDRBW8.PDF (331 K)

Detailed overview of design layout for component placement

download CAD/CAE symbol — TIDA-00168
TIDRBX0.ZIP (10039 K)

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

download Gerber file — TIDA-00168
TIDC772.ZIP (1690 K)

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

download PCB layout — TIDA-00168
TIDRBW9.PDF (1685 K)

PCB layer plot file used for generating PCB design layout

Products

Includes TI products in the design and potential alternatives.

Precision ADCs

ADS1220 — 24-bit, 2-kSPS, four-channel, low-power, delta-sigma ADC with PGA, VREF, SPI and two IDACs

Data sheet: PDF | HTML
I2C general-purpose I/Os (GPIOs)

TCA9535 — 16-bit 1.65- to 5.5-V I2C/SMBus I/O expander with interrupt & config registers

Data sheet: PDF | HTML
MSP430 microcontrollers

MSP430FR5949 — 16 MHz MCU with 64KB FRAM, 2KB SRAM, AES, 12-bit ADC, comparator, DMA, UART/SPI/I2C, timer

Data sheet: PDF | HTML
Series voltage references

REF5020 — 2.048-V, 3-µVpp/V noise, 3-ppm/°C drift precision series voltage reference

Data sheet: PDF | HTML

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Software

Technical documentation

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View all 2
Type Title Date
* Design guide Thermocouple AFE Using RTD and Internal Temperature Sensor of ADS1220 for CJC Nov. 16, 2014
Technical article It's in the math: how to convert an ADC code to a voltage (part 2) Apr. 29, 2016

Related design resources

Reference designs

REFERENCE DESIGN
TIDA-00095 — RTD Temperature Transmitter for 2-wire, 4 to 20-mA Current Loop Systems TIDA-00165 — Small Form Factor, 2-Wire 4 to 20mA Current Loop RTD Temperature Transmitter Reference Design TIDA-00189 — Isolated Loop Powered Thermocouple Transmitter Reference Design TIDA-00247 — Single Chip 2-Wire Loop Powered, 4 to 20mA Current Loop RTD Temperature Transmitter Reference Design TIDA-00459 — Highly Efficient Power & Data Transmission for Isolated Low Power Applications Reference Design

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