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TIDM-01000

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

Design files

TIDM-01000

Design files

Overview

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.

Features
  • 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.

download Design guide — TIDM-01000
TIDUE64.PDF (11116 K)

Reference design overview and verified performance test data

download Schematic — TIDM-01000
TIDRWE8.PDF (193 K)

Detailed schematic diagram for design layout and components

download Bill of materials (BOM) — TIDM-01000
TIDRWE9.PDF (44 K)

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

download Assembly drawing — TIDM-01000
TIDRWF0.PDF (107 K)

Detailed overview of design layout for component placement

download CAD/CAE symbol — TIDM-01000
TIDRWF2.ZIP (490 K)

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

download Gerber file — TIDM-01000
TIDCEP4.ZIP (323 K)

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

download PCB layout — TIDM-01000
TIDRWF1.PDF (506 K)

PCB layer plot file used for generating PCB design layout

Products

Includes TI products in the design and potential alternatives.

MSP430 microcontrollers

MSP430FR2353 — 24 MHz 105 C integrated analog microcontroller with 16 KB FRAM, Op-Amps/PGAs, 12-bit DACs, 12-bit AD

Data sheet: PDF
MSP430 microcontrollers

MSP430FR2355 — 24-MHz 105-C integrated analog microcontroller with 32-KB FRAM, Op-Amps/PGAs, 12-bit DACs, 12-bit AD

Data sheet: PDF
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
Precision ADCs

ADS1120 — 16-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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Software

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 PDF | HTML Jun. 06, 2018

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