Temperature Sensor Interface Module for Programmable Logic Controllers (PLC)
This product has been released to the market and is available for purchase. For some products, newer alternatives may be available.

Description & Features

Technical documentation

Support & Training

Order Now

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

Key Document


The TIDA-00018 reference design enables faster development of high precision temperature measurement solutions using 24-Bit delta-sigma ADC and most widely used temperature sensors like thermocouple and RTD. The design guide will address the sensor signal conditioning, thermocouple cold junction compensation, ratiometric measurement technique for RTD, recommended software flow, sensor linearization, sensor diagnostics, transient protection, PCB layout and other practical design considerations for achieving high precision robust design for temperature measurement in industrial applications.  The Temperature Sensor Interface Module is a fully isolated design, which is essential for small sensor signal measurement. The heart of this reference design is a 24-Bit delta-sigma ADC that provides a high resolution, high integration, low noise, and low cost complete sensor analog front-end (AFE) for DC sensing applications. This ADC also makes it suitable to interface with different types of sensors, thus saving board space, reducing design efforts, decreasing the time to market, and lower BOM cost. Furthermore, external protection circuitry has been successfully tested for compliance with regulatory IEC61000-4 EFT, ESD, and surge standards. Compliance to IEC61000-4 is necessary to ensure that the design not only survives but also perform as intended in the harsh/noisy industrial environment.

  • Two different sensor input channels:
    • K-Type thermocouple input with CJC
    • Compatible to 2-, 3- or 4-wire RTD probes
  • Ratiometric measurement for RTD
  • Overall measurement accuracy better than:
    • For thermocouple: ±1°C
    • For RTD: ±0.4°C
  • Sensor wire open circuit or signal out-of-range detection
  • Comply to IEC-61000-4 requirements:
    • IEC-61000-4-4: EFT up to ±1KV @ 5KHz on signal ports
    • IEC-61000-4-2: ESD up to 4KV contact & 8KV air discharge
    • IEC-61000-4-5: Surge up to ±1KV line-earth (CM) on signal ports

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


Schematic/Block Diagram

Quickly understand overall system functionality.

Download Schematic

Test Data

Get results faster with test and simulation data that's been verified.

Download Test Data

Design Files

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

Download Design Files

TI Devices (11)

Order samples, get tools and find more information on the TI products in this reference design.

Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
ADS1220  24-bit, 2-kSPS, 4-ch, low-power, small-size delta-sigma ADC w/ PGA, VREF, 2x IDACs & SPI interface  Analog-to-digital converters (ADCs)  Sample & Buy View Design Kits & Evaluation Modules
ISO1540  2.5-kVrms, isolated bidirectional clock, bidirectional I2C isolator  Isolated interface ICs  Sample & Buy View Design Kits & Evaluation Modules
ISO7141CC  Quad-channel, 3/1, 50-Mbps digital isolator  Isolation  Sample & Buy View Design Kits & Evaluation Modules
LM5017  7.5-100V Wide Vin, 600mA Constant On-Time Synchronous Buck Regulator  Offline & isolated DC/DC controllers & converters  Sample & Buy View Design Kits & Evaluation Modules
LM5069  9-V to 80-V hot swap controller with power limiting  Power switches  Sample & Buy View Design Kits & Evaluation Modules
LM94022  ±1.5°C Temperature Sensor with Multiple Gain and Class-AB Analog Output  Temperature sensors  Sample & Buy View Design Kits & Evaluation Modules
TCA6408A  8-bit translating 1.65- to 5.5-V I2C/SMBus I/O expander with interrupt, reset & config registers  I2C ICs  Sample & Buy View Design Kits & Evaluation Modules
TMP275  ±0.5°C Temperature Sensor with I2C/SMBus Interface in Industry Std LM75 Form Factor & Pinout  Temperature sensors  Sample & Buy Not Available
TPS715  50-mA, 24-V, ultra-low-IQ, low-dropout voltage regulator  Power management  Sample & Buy View Design Kits & Evaluation Modules
TPS7A49  150-mA, 36-V, low-noise, high-PSRR, adjustable low-dropout voltage regulator with enable  Power management  Sample & Buy View Design Kits & Evaluation Modules
TS5A23159  1-Ω on-state resistance, 5-V, 2:1 (SPDT), 2-channel analog switch with powered-off protection  Switches & multiplexers  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
ADS1220 Download Download
Download Download
ISO1540 Download Download
ISO7141CC Download Download
LM5017 Download Download
Download Download
LM5069 Download Download
LM94022 Download Download
TCA6408A Download Download
Download Download
Download Download
TMP275 Download Download
Download Download
TPS715 Download Download
TPS7A49 Download Download
Download Download
TS5A23159 Download Download
Download Download

Texas Instruments and Accelerated Designs, Inc. have collaborated together to provide TI customers with schematic symbols and PCB layout footprints for TI products.

Step 1: Download and install the free download.

Step 2: Download the Symbol and Footprint from the CAD.bxl file table.

Technical documentation

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

User guide (1)
Title Type Size (KB) Date
PDF 3225 26 Mar 2014
Design files (5)
Title Type Size (KB) Date
ZIP 319 12 May 2014
ZIP 3888 12 May 2014
PDF 645 12 May 2014
PDF 202 12 May 2014
PDF 408 12 May 2014
Related Tools & Software

Reference Designs (2)

Support & training

TI E2E™ forums with technical support from TI engineers

Search our extensive online knowledge base where millions of technical questions and answers are available 24/7.

Search answers from TI experts

Content is provided 'AS IS' by the respective TI and Community contributors and does not constitute TI specifications.
See terms of use.

If you have questions about quality, packaging, or ordering TI products visit our Support page.

Technical articles