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TIDA-010002
Replacing platinum RTD sensors with digital temperature sensors reference design
TIDA-010002
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.
TIDUEA0A.PDF (1246 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.
ESD protection diodes
TPD1E04U04 — 0.5-pF, 3.6-V, ±16-kV ESD protection diode with in 0402 & 0201 packages for HDMI 2.0 & USB 3.0
Data sheet: PDF | HTMLStart development
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 | Mar. 01, 2019 |
| Technical article | How to achieve rapid temperature sensor design with RTD-level accuracy and no cali | PDF | HTML | Dec. 07, 2018 |
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