Small Form Factor, 2-Wire 4 to 20mA Current Loop RTD Temperature Transmitter Reference Design


Design files


This is a reference design for a robust, low power, precise and long-term stable 2-wire loop powered 4 to 20mA current output temperature transmitter. It uses RTD temperature sensor with 4 to 20mA current loop transmitter. It also explains sensor signal conditioning, ratiometric measurement technique, recommended software flow, calibration, sensor linearization, PCB layout and other practical design considerations. Furthermore, external protection circuitry is deployed in-place for compliance with regulatory IEC61000-4 standards – EFT, ESD and Surge requirements. EMC compliance to IEC61000-4 is necessary to ensure that the design not only survives but also performs as intended in the harsh/noisy industrial environment. All the relevant design files like Schematics, BOM, Layer plots, Altium files, Gerber and MSP430 MCU software have also been provided to the users.

  • Small form factor (L X W): 71.12mm X 6mm
  • Sensor input compatible with 2-, 3- or 4-wire RTD probes
  • Connects to any RTD from PT100 to PT1000
  • Maximum measured error: 0.2°C
  • Output resolution: 0.76µA
  • Input power supply range: 10V to 33V DC


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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.

TIDU385A.PDF (16567 K)

Reference design overview and verified performance test data

TIDR966.PDF (7610 K)

Detailed schematic diagram for design layout and components

TIDR967.PDF (208 K)

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

TIDR968.ZIP (140 K)

Detailed overview of design layout for component placement

TIDR970.ZIP (1880 K)

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

TIDC543.ZIP (359 K)

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

TIDR969.PDF (957 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Linear & low-dropout (LDO) regulators

TPS7A16100-mA, 60-V, ultra-low-IQ, low-dropout (LDO) voltage regulator with power good and enable

Data sheet: PDF | HTML
MSP430 microcontrollers

MSP430FR573824 MHz MCU with 16KB FRAM, 1KB SRAM, 10-bit ADC , comparator, UART/SPI/I2C, timer

Data sheet: PDF | HTML
Precision ADCs

ADS122024-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)

DAC161S99716-Bit Precision DAC With Internal Reference and 4mA-to-20mA Current Loop Drive

Data sheet: PDF | HTML

Start development



TIDC545 TIDA-00165 Firmware

Technical documentation

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Type Title Date
* Design guide Small Form Factor, 2-Wire, 4- to 20-mA Current-Loop, RTD Temperature Transmitter (Rev. A) Nov. 11, 2014
White paper Powering sensors with LDOs for industrial process control white paper Feb. 12, 2015

Related design resources

Reference designs

TIDA-00095 RTD Temperature Transmitter for 2-wire, 4 to 20-mA Current Loop Systems TIDA-00168 Thermocouple AFE Using RTD or Integrated Temperature Sensor for Cold Junction Compensation (CJC) TIDA-00189 Isolated Loop Powered Thermocouple Transmitter Reference Design 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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