Isolated Loop Powered Thermocouple Transmitter Reference Design TIDA-00189 (ACTIVE)

Description & Features

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Key Document

Description

The Isolated Loop powered Thermocouple Transmitter reference design is a system solution providing precision K-type thermocouple measurements for 4 to 20-mA isolated current-loop applications. This design is intended as an evaluation module for users to fast prototype and develop end-products for process-control and factory-automation. Potential challenges with thermocouples as a temperature sensor include tiny voltage outputs, low sensitivity and nonlinearity; in addition, because in industrial environments ground potential differences higher than 100V are common, thermocouple and signal conditioning circuitry must be galvanically isolated. The design files include design considerations, block diagrams, schematics, Bill of Materials (BOM), layer plots, Altium files, Gerber Files, and MSP430 Firmware.

Watch the TIDA-00349 Overview video, covering the same isolated power topology as used in the TIDA-00189 NOW

Features
  • Sensor input compatible with k-Type Thermocouple  probes ( -200°C to +1375°C)
  • Operating temperature of the circuit -40°C to +85°C
  • Implements Cold Junction compensation (RTD based)
  • Front End accuracy < 0.5°C (-200°C to +270°C) and < 0.15% (270°C to +1375°C)
  • 4 to 20mA current loop output signal
  • Design to meet IEC 61000-4-5

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Schematic/Block Diagram

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Test Data

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Design Files

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TI Devices (6)

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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
DAC161P997  Single-Wire 16-bit DAC for 4-20mA Loops  Digital-to-analog converters (DACs)  Sample & Buy View Design Kits & Evaluation Modules
MSP430F5172  25MHz MCU with Two 16-bit High Res Timers, 32KB flash, 2KB RAM, 10-bit ADC, 16-channel Comparator  MSP430 ultra-low-power MCUs  Sample & Buy View Design Kits & Evaluation Modules
SN74LVC125A  Quadruple Bus Buffer Gate With 3-State Outputs  Buffer/driver  Sample & Buy View Design Kits & Evaluation Modules
TPS60402  60mA Charge Pump Voltage Inverter with Fixed 50kHz Operation  DC/DC switching regulators  Sample & Buy View Design Kits & Evaluation Modules
TPS7A16  60-V, 5-µA IQ, 100-mA low-dropout (LDO) voltage regulator with enable and power good  Power management  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
ADS1220 Download Download
Download Download
DAC161P997 Download Download
MSP430F5172 Download -
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SN74LVC125A Download Download
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TPS60402 Download Download
TPS7A16 Download -
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Technical Documents

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User guides (1)
Title Type Size (KB) Date
PDF 8443 19 Jul 2016
Design files (7)
Title Type Size (KB) Date
ZIP 484 10 Oct 2014
ZIP 1416 10 Oct 2014
PDF 6231 10 Oct 2014
PDF 3498 10 Oct 2014
PDF 342 10 Oct 2014
PDF 72 10 Oct 2014
PDF 948 10 Oct 2014
Related Tools & Software

Reference Designs  ( 5 )

Software (1)



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