Replacing platinum RTD sensors with digital temperature sensors reference design
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Key Document


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.

  • 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)

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Design Files

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TI Devices (3)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
ESD351  1.8-pF, 3.3V, ±30-kV ESD protection diode with 6.5-V, 16-A TLP clamping in 0402 package for USB 2.0  Circuit protection ICs  Sample & Buy View Design Kits & Evaluation Modules
TMP116  ±0.2°C Accurate Digital Temperature Sensor With NV Memory  Temperature sensors  Sample & Buy View Design Kits & Evaluation Modules
TPD1E04U04  0.5-pF, 3.6-V, ±16-kV ESD protection diode with in 0402 & 0201 packages for HDMI 2.0 & USB 3.0  Circuit protection ICs  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
ESD351 Download
TMP116 Download Download
TPD1E04U04 Download

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Technical documentation

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User guide (1)
Title Type Size (KB) Date
PDF 3014 08 Sep 2020
Design files (6)
Title Type Size (KB) Date
ZIP 310 01 Mar 2019
ZIP 302 01 Mar 2019
PDF 182 01 Mar 2019
PDF 70 01 Mar 2019
PDF 52 01 Mar 2019
PDF 110 01 Mar 2019
Related Tools & Software

Hardware development (2)

Name Part Number Tool Type
MSP430FR6047 ultrasonic sensing evaluation module  EVM430-FR6047  Evaluation board 
TMP116 High-Precision Digital Temperature Sensor Evaluation Module  TMP116EVM  Evaluation board 

Software development (2)

Name Part Number Software Type
MSP430 MCUs Ultrasonic Sensing Design Center  MSP-ULTRASONIC-DESIGN-CENTER  Driver or library 

Models (1)

Title Category Type Size (KB) Date Views
TIDA-010002 Simulation TINA-TI Reference Design ZIP 6 KB 01 Mar 2019

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