Software
Firmware
TIDA-00189
Isolated Loop Powered Thermocouple Transmitter Reference Design
TIDA-00189
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
- Capacitive Level Transmitter
- Capacitive pressure transmitter
- Coriolis Flow Transmitter
- Differential Pressure Flow Transmitter
- Electromagnetic (MID) flow transmitter
- Hydrometric Pressure Level Transmitter
- Impeller / Turbine Flow Transmitter
- Inductive & capacitive position sensor
- LVDT Position Sensor
- LVDT pressure transmitter
- Optical ToF continuous wave position sensor
- Optical ToF pulse position sensor
- Proximity switch
- Radar / microwave level transmitter
- Resistive pressure transmitter
- Silicon pressure transmitter
- Temperature transmitter
- Thermal Mass Flow Transmitter
- Ultrasonic flow transmitter
- Ultrasonic level transmitter
- Ultrasonic position sensor
- Vortex flow transmitter
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.
TIDU449B.PDF (8443 K)
Reference design overview and verified performance test data
TIDRB93.PDF (948 K)
Detailed schematic diagram for design layout and components
TIDRB94.PDF (72 K)
Complete listing of design components, reference designators, and manufacturers/part numbers
TIDRB95.PDF (342 K)
Detailed overview of design layout for component placement
TIDRB98.ZIP (1416 K)
Files used for 3D models or 2D drawings of IC components
TIDC700.ZIP (484 K)
Design file that contains information on physical board layer of design PCB
TIDRB96.PDF (3498 K)
PCB layer plot file used for generating PCB design layout
TIDRB97.PDF (6231 K)
PCB layer plot file used for generating PCB design layout
Products
Includes TI products in the design and potential alternatives.
MSP430 microcontrollers
MSP430F5172 — 25 MHz MCU with 32KB Flash, 2KB SRAM, 10-bit ADC, comparator, DMA, 16-bit High Resolution timer
Data sheet: PDF | HTMLNoninverting buffers & drivers
SN74LVC125A — Four-channel 1.65V-to-3.6V buffers with 3-state outputs
Data sheet: PDF | HTMLPrecision DACs (≤10 MSPS)
DAC161P997 — Single-Wire 16-bit DAC for 4-20mA Loops
Data sheet: PDF | HTMLStart development
Technical documentation
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| 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 smar | PDF | HTML | Nov. 07, 2016 |
Related design resources
Reference designs
REFERENCE DESIGN
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