RTD replacement for cold junction compensation reference design in a temperature sensor
TIDA-010019
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Key Document

Description

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

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Design Files

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TI Devices (13)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
ADS112U04  16-bit, 2-kSPS, 4-ch, low-power, small-size delta-sigma ADC w/ PGA, VREF, 2x IDACs & UART interface  Analog-to-digital converters (ADCs)  Sample & Buy View Design Kits & Evaluation Modules
ADS7142  12-bit 140-kSPS 2-ch nanopower SAR ADC with 1.8-V operation in 1.5-mm x 2-mm QFN package  Analog-to-digital converters (ADCs)  Sample & Buy View Design Kits & Evaluation Modules
INA317  Micro-Power (50 µA), Zero-Drift, Rail-to-Rail-Out Instrumentation Amplifier  Amplifiers  Sample & Buy Not Available
ISO7721  High-speed, robust-EMC reinforced dual-channel digital isolator  Isolation  Sample & Buy View Design Kits & Evaluation Modules
LMT01  0.5°C Accurate 2-pin Temperature Sensor with a Pulse Train Interface  Temperature sensors  Sample & Buy View Design Kits & Evaluation Modules
LMT70  ±0.1°C ultra-small, high-precision, low-power CMOS analog temperature sensor with an o  Temperature sensors  Sample & Buy View Design Kits & Evaluation Modules
LPV821  650nA, Precision Zero-Drift Nanopower Amplifier  Operational amplifiers (op amps)  Sample & Buy View Design Kits & Evaluation Modules
MSP430FR2355  24MHz 105C ULP Microcontroller With 32 KB FRAM, 4 KB SRAM, 44 IO, 12-bit ADC, 12-bit DACs, OpAmp/PGA  Microcontrollers (MCU)  Sample & Buy View Design Kits & Evaluation Modules
REF2125  Low-Drift Low-Power Small-Footprint Series Voltage Reference With Clean Start  Voltage references  Sample & Buy Not Available
TMP117  ±0.1°C accurate digital temperature sensor with integrated NV memory  Temperature sensors  Sample & Buy View Design Kits & Evaluation Modules
TMP235  ±2°C Analog output temperature sensor, with 10mV /°C gain  Temperature sensors  Sample & Buy View Design Kits & Evaluation Modules
TPS22946  5.5V, 0.2A, 400mΩ Selectable Current Limit Load Switch  Power switches  Sample & Buy View Design Kits & Evaluation Modules
TPS727  250-mA, Ultralow IQ, Fast Transient Response, RF Low-Dropout Linear Regulator  Power management  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
ADS112U04 Download Download
Download Download
ADS7142 Download Download
INA317 Download Download
ISO7721 Download Download
Download Download
Download Download
LMT01 Download -
Download Download
LMT70 Download -
MSP430FR2355 Download Download
Download Download
Download Download
Download Download
REF2125 Download -
TMP117 Download Download
Download -
TMP235 Download
Download
TPS22946 Download -
TPS727 Download -
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Technical Documents

See the Important Notice and Disclaimer covering reference designs and other TI resources.

Application notes (1)
Title Type Size (KB) Date
PDF 1105 22 Jul 2019
User guides (1)
Title Type Size (KB) Date
PDF 4060 13 Sep 2019
Design files (6)
Title Type Size (KB) Date
ZIP 381 19 Mar 2019
ZIP 1712 19 Mar 2019
PDF 2097 19 Mar 2019
PDF 540 19 Mar 2019
PDF 107 19 Mar 2019
PDF 649 19 Mar 2019
Related Tools & Software

Reference Designs  ( 1 )

Name Part Number Tool Type
Isolated power and data interface for low-power applications reference design  TIDA-010018  TI Designs

Software (1)



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