TIDA-010002

Replacing platinum RTD sensors with digital temperature sensors reference design

TIDA-010002

Design files

Overview

This reference design for the differential temperature measurement (DTM) subsystem of heat and cooling meters provides a fully digital alternative to thin-film platinum Resistance Temperature Detector (RTD) sensors. The Precision Temperature Sensor (PTS) achieves Class A RTD sensor accuracy from the –55° Celsius to 125° Celsius with zero calibration and Class AA accuracy with single-point calibration. The Digital RTD approach streamlines manufacturing processes by using integrated EEPROM memory to store user-defined parameters, eliminating the need to create and maintain accompanying documentation. The Digital RTD simplifies the analog signal processing by eliminating the offset and gain calibration steps of the analog to digital conversion required in traditional DTM systems. Electrostatic discharge (ESD) protection devices on the printed circuit board (PCB) protect against contact or air ESD strikes of up to 30 kV. The small size PCB fits into a 5.2-mm outer diameter metal sheath as commonly used with standard PT100/500/1000 sensors.

This digital RTD subsystem works with MSP430™ and SimpleLink™ microcontroller device families, using a four-wire digital interface.

Features
  • Fully digital precision temperature sensor as an alternative to platinum resistance temperature detectors; fits into standard 5.2mm sheath used in heat meters
  • Eliminates precision reference resistor, RC-matched filters and impedance controlled signal traces used in two- or four-wire RTD configurations
  • No calibration required to meet IEC/EN 60751-2008 Class A accuracy over -55 to 125°C; single-point calibration for Class AA accuracy
  • Standard I2C interface to host microcontrollers (four-wire digital interface with I2C-bus + VDD + GND)
  • Meets IEC61000-4-2 Level 4 ESD protection 
  • This subsystem is tested and includes firmware to interface with the MSP430FR6047 Ultrasonic Water Flow Meter Kit (EVM430-FR6047)

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.

PDF | HTML
TIDUEA0A.PDF (1280 K)

Reference design overview and verified performance test data

TIDRZ45.PDF (110 K)

Detailed schematic diagram for design layout and components

TIDRZ46.PDF (52 K)

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

TIDRZ47.PDF (70 K)

Detailed overview of design layout for component placement

TIDRZ49.ZIP (302 K)

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

TIDCFB6.ZIP (310 K)

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

TIDRZ48.PDF (182 K)

PCB layer plot file used for generating PCB design layout

Products

Includes TI products in the design and potential alternatives.

Digital temperature sensors

TMP1160.2C digital temperature sensor, 64-bit non-volatile memory

Data sheet: PDF | HTML
ESD & surge protection ICs

ESD3511.8-pF, 3.3V, ±30-kV ESD protection diode with 6.5-V, 16-A TLP clamping in 0402 package for USB 2.0

Data sheet: PDF | HTML
ESD & surge protection ICs

TPD1E04U040.5-pF, 3.6-V, ±16-kV ESD protection diode with in 0402 & 0201 packages for HDMI 2.0 & USB 3.0

Data sheet: PDF | HTML

Start development

Software

Support software

TIDA-010002 Digital RTD for Heat Meters — TIDCFB7.ZIP (9221 K)

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Technical documentation

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Type Title Date
* Design guide Replacing Platinum RTD Sensors With Digital Temperature Sensors Reference Design (Rev. A) PDF | HTML Sep. 08, 2020
Technical article How to achieve rapid temperature sensor design with RTD-level accuracy and no calibration Dec. 07, 2018

Related design resources

Hardware development

EVALUATION BOARD
EVM430-FR6047 MSP430FR6047 ultrasonic sensing evaluation module TMP116EVM TMP116 High-Precision Digital Temperature Sensor Evaluation Module

Software development

DRIVER OR LIBRARY
MSP-ULTRASONIC-DESIGN-CENTER MSP430 MCUs Ultrasonic Sensing Design Center

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