Temperature Sensor Interface Module for Programmable Logic Controllers (PLC)

(ACTIVE) TIDA-00018

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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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Bill of Materials (BOM)

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TI Devices (12)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
ADS1220  24-Bit, 2kSPS, 4-Ch, Low-Power Delta-Sigma ADC With PGA and 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  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  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
TMUX1072  2-Channel 2:1 Analog Multiplexer With 20-V Overvoltage Protection  Switches & multiplexers  Sample & Buy View Design Kits & Evaluation Modules
TPS715  50 mA, 24 V, 3.2-μA Iq, Low-Dropout Linear Regulator in SC70 Package  Power management  Sample & Buy View Design Kits & Evaluation Modules
TPS7A49  Vin 3V to 36V, 150mA, Ultra-Low-Noise, High-PSRR Low-Dropout (LDO) Linear Regulator  Power management  Sample & Buy View Design Kits & Evaluation Modules
TS5A23159  2-Channel, 2:1 Analog Switch with Low On-State Resistance (1Ω) and 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
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ISO1540 Download Download
ISO7141CC Download Download
LM5017 Download Download
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LM5069 Download Download
LM94022 Download Download
TCA6408A Download Download
Download Download
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TMP275 Download Download
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TMUX1072 Download
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TPS715 Download Download
TPS7A49 Download Download
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TS5A23159 Download Download
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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 243
Design files (5)
Title Abstract Type Size (KB) Date Views
ZIP 319 12 May 2014 8
ZIP 3888 12 May 2014 10
PDF 645 12 May 2014 4
PDF 202 12 May 2014 180
PDF 408 12 May 2014 218
Related Tools & Software

Reference Designs  ( 3 )

Design Kits & Evaluation Modules  ( 1 )

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

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