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TIDA-00189

Isolated Loop Powered Thermocouple Transmitter Reference Design

Design files

TIDA-00189

Design files

Overview

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
Industrial
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A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

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

download Design guide — TIDA-00189
TIDU449B.PDF (8443 K)

Reference design overview and verified performance test data

download Schematic — TIDA-00189
TIDRB93.PDF (948 K)

Detailed schematic diagram for design layout and components

download Bill of materials (BOM) — TIDA-00189
TIDRB94.PDF (72 K)

Complete listing of design components, reference designators, and manufacturers/part numbers

download Assembly drawing — TIDA-00189
TIDRB95.PDF (342 K)

Detailed overview of design layout for component placement

download CAD/CAE symbol — TIDA-00189
TIDRB98.ZIP (1416 K)

Files used for 3D models or 2D drawings of IC components

download Gerber file — TIDA-00189
TIDC700.ZIP (484 K)

Design file that contains information on physical board layer of design PCB

download PCB layout — TIDA-00189
TIDRB96.PDF (3498 K)

PCB layer plot file used for generating PCB design layout

download PCB layout — TIDA-00189
TIDRB97.PDF (6231 K)

PCB layer plot file used for generating PCB design layout

Products

Includes TI products in the design and potential alternatives.

Charge pumps (inductorless)

TPS60402 — 60mA Charge Pump Voltage Inverter with Fixed 50kHz Operation

Data sheet: PDF | HTML
Linear & low-dropout (LDO) regulators

TPS7A16 — 100-mA, 60-V, ultra-low-IQ, low-dropout (LDO) voltage regulator with power good and enable

Data sheet: PDF | HTML
MSP430 microcontrollers

MSP430F5172 — 25 MHz MCU with 32KB Flash, 2KB SRAM, 10-bit ADC, comparator, DMA, 16-bit High Resolution timer

Data sheet: PDF | HTML
Noninverting buffers & drivers

SN74LVC125A — 4-ch, 1.65-V to 3.6-V buffers with 3-state outputs

Data sheet: PDF | HTML
Precision ADCs

ADS1220 — 24-bit, 2-kSPS, four-channel, low-power, delta-sigma ADC with PGA, VREF, SPI and two IDACs

Data sheet: PDF | HTML
Precision DACs (≤10 MSPS)

DAC161P997 — Single-Wire 16-bit DAC for 4-20mA Loops

Data sheet: PDF | HTML

Start development

Software

Technical documentation

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View all 5
Type Title Date
* Design guide Isolated Loop Powered Thermocouple Transmitter Design Guide (Rev. B) Jul. 19, 2016
Technical article What’s next for Industry 4.0? The best new technologies shaping the future of smart factories Nov. 07, 2016
Technical article How to design fully isolated 4-wire sensor transmitters Oct. 21, 2015
Technical article How to design power-isolated 4-wire sensor transmitters Sep. 18, 2015
Technical article Designing output isolated 4-wire sensor transmitters Aug. 28, 2015

Related design resources

Reference designs

REFERENCE DESIGN
TIDA-00095 — RTD Temperature Transmitter for 2-wire, 4 to 20-mA Current Loop Systems TIDA-00165 — Small Form Factor, 2-Wire 4 to 20mA Current Loop RTD Temperature Transmitter Reference Design TIDA-00168 — Thermocouple AFE Using RTD or Integrated Temperature Sensor for Cold Junction Compensation (CJC) TIDA-00247 — Single Chip 2-Wire Loop Powered, 4 to 20mA Current Loop RTD Temperature Transmitter Reference Design TIDA-00459 — Highly Efficient Power & Data Transmission for Isolated Low Power Applications Reference Design

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