4- to 20-mA Loop-Powered RTD Temperature Transmitter Reference Design With MSP430 Smart Analog Combo


Design files


This TI reference design provides a low-component count, low-cost solution for 4- to 20-mA loop-powered, resistance-temperature detector (RTD), temperature transmitter. The design takes advantage of the on-chip Smart Analog Combo module in the MSP430FR2355 MCU to control the loop current, so  the standalone DAC is no longer required. This design achieves a 12-bit output resolution with an output current resolution of 6 µA. The design incorporates reverse-polarity protection as well as IEC61000-4-2 and IEC61000-4-4 protection on the loop-power input.

  • Sensor Input Compatible with 2-, 3- or 4-Wire Resistance Temperature Detector (RTD) Probes
  • Temperature range for RTD of –200°C to 850°C
  • Maximum Measured Error: <1°C
  • IEC61000-4-2: ESD: Air Discharge: ±8 kV Class A
  • Small Form Factor (L × W): 60mm × 8mm
  • Operating Temperature Range -40°C to 105°C
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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.

TIDUE64.PDF (11116 K)

Reference design overview and verified performance test data


Detailed schematic diagram for design layout and components


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


Detailed overview of design layout for component placement


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


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


PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

MSP430 microcontrollers

MSP430FR235324 MHz 105 C integrated analog microcontroller with 16 KB FRAM, Op-Amps/PGAs, 12-bit DACs, 12-bit AD

Data sheet: PDF | HTML
MSP430 microcontrollers

MSP430FR235524-MHz 105-C integrated analog microcontroller with 32-KB FRAM, Op-Amps/PGAs, 12-bit DACs, 12-bit AD

Data sheet: PDF | HTML
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
Precision ADCs

ADS112016-bit, 2-kSPS, 4-ch, low-power, small-size delta-sigma ADC with PGA, VREF, 2x IDACs & SPI interface

Data sheet: PDF | HTML

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Support software

TIDM-01000 Firmware — TIDCEP5.ZIP (200 K)

Technical documentation

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Type Title Date
* Design guide 4- to 20-mA Loop-Powered RTD Temperature Transmitter Reference Design May 21, 2018
Technical article Get more signal chain from your MCU in factory automation applications Jun. 06, 2018

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