Temperature Sensor Interface Module for Programmable Logic Controllers (PLC)

(ACTIVE) TIDA-00018

Description & Features

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Key Document

Description

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.

Features
  • 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

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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, 2kSPS, 4-Ch, Low-Power Delta-Sigma ADC with PGA & VREF for Small Signal Sensors  Analog-to-Digital Converters (ADCs)  Sample & Buy View Design Kits & Evaluation Modules
ISO1540  2.5 kVrms Isolated Bidirectional Clock, Bidirectional I2C Isolators  Isolation  Sample & Buy View Design Kits & Evaluation Modules
ISO7141CC  4242-VPK Small-Footprint and Low-Power 3/1 Quad Channel Digital Isolator with Noise Filter  Isolation  Sample & Buy View Design Kits & Evaluation Modules
LM5017  7.5-100V Wide Vin, 600mA Constant On-Time Synchronous Buck Regulator  Step-Down (Buck)  Sample & Buy View Design Kits & Evaluation Modules
LM5069  Positive High Voltage Hot Swap / Inrush Current Controller with Power Limiting  Protection, Monitoring and Hot Swap  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  Low-Voltage 8-Bit I2C and SMBus I/O Expander  I2C  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, 3.2-μA Iq, Low-Dropout Linear Regulator in SC70 Package  Linear Regulator (LDO)  Sample & Buy View Design Kits & Evaluation Modules
TPS7A49  Vin 3V to 36V, 150mA, Ultra-Low Noise, High PSRR, Low-Dropout Linear Regulator  Linear Regulator (LDO)  Sample & Buy View Design Kits & Evaluation Modules
TS5A23159  1-Ohm 5-V/3.3-V 2-Channel SPDT Switch  Switches and Multiplexers  Sample & Buy Not Available

Technical Documents

View the Important Notice for TI Designs covering authorized use, intellectual property matters and disclaimers.

User guides (1)
Title Abstract Type Size (KB) Date Views TI Recommends
PDF 3225 26 Mar 2014 1,386
Design files (5)
Title Abstract Type Size (KB) Date Views
ZIP 319 12 May 2014 73
ZIP 3888 12 May 2014 57
PDF 645 12 May 2014 38
PDF 202 12 May 2014 34
PDF 408 12 May 2014 196
Related Tools & Software

Reference Designs (4)

Design Kits & Evaluation Modules (1)

Name Part Number Tool Type
BeagleBone Black Development Board  BEAGLEBK  Evaluation Modules & Boards 


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