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


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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Schematic/Block Diagram

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Design Files

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TI Devices (4)

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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
DAC161S997  16-Bit Precision DAC With Internal Reference and 4mA-to-20mA Current Loop Drive  Digital-to-analog converters (DACs)  Sample & Buy View Design Kits & Evaluation Modules
MSP430FR5738  24 MHz MCU with 16KB FRAM, 1KB SRAM, 10-bit ADC , comparator, UART/SPI/I2C, timer  Microcontrollers (MCUs)  Sample & Buy View Design Kits & Evaluation Modules
TPS7A16  100-mA, 60-V, ultra-low-IQ, low-dropout (LDO) voltage regulator with power good and enable  Power management  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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DAC161S997 Download
MSP430FR5738 Download
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TPS7A16 Download Download
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Technical documentation

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User guide (1)
Title Type Size (KB) Date
PDF 16567 11 Nov 2014
White paper (1)
Title Type Size (KB) Date
PDF 1238 12 Feb 2015
Design files (6)
Title Type Size (KB) Date
ZIP 359 30 Jul 2014
ZIP 1880 30 Jul 2014
PDF 957 30 Jul 2014
ZIP 140 30 Jul 2014
PDF 208 30 Jul 2014
PDF 7610 30 Jul 2014
More literature (1)
Title Type Size (KB) Date
ZIP 156 30 Jul 2014
Related Tools & Software

Reference Designs (5)

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