High Precision Temperature Measurement for Heat and Cold Meters Reference Design


Design files


This reference design implements a high-precision differential temperature measurement (DTM) subsystem using a 24-bit, low-power, delta-sigma ADC. Heat and cold meter DTM subsystems typically use two 2- or 4-wire Resistance Temperature Detectors (RTD) such as PT100, PT500, or PT1000 and can achieve a differential temperature measurement accuracy of 10 mK over a water temperature range of 3°C to 180°C. TIDA-01526 implements a single chip, cost-effective DTM system that can be combined with TI's ultra-sonic or rotation detection flow measurement subsystems to provide a full heat or cold meter solution.

  • Meets EN1434 requirements for RTD sensor pair temperature measurement subsystems in heat and cold meters and heat calculators
  • Max. 60 mK absolute temperature deviation from 0 to 150°C for 2- or 4-wire RTDs meets ±100 mK limit (EN1434-5:2014)
  • Meets max. ±700 mK error limit for each PT sensor at 3 typical temperature measurements points, e.g. at 10°C, 30°C and 50°C (EN1434-5:2014)
  • ADC122x04 achieves ultra-low power consumption by power-cycling with 50-μs start-up time and programmable current source, gain, and output data rates
  • Differential temperature measurement of two RTDs in series with 0.01°C resolution
  • 40-pin BoosterPack form factor (BoosterPack 20-pin backwards compatible)
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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.

TIDUDE4.PDF (1705 K)

Reference design overview and verified performance test data

TIDRV83.PDF (263 K)

Detailed schematic diagram for design layout and components

TIDRV84.PDF (66 K)

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

TIDRV85.PDF (121 K)

Detailed overview of design layout for component placement

TIDRV87.ZIP (618 K)

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


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

TIDRV86.PDF (511 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Linear & low-dropout (LDO) regulators

LP5907250-mA, low-noise, high-PSRR, ultra-low-dropout voltage regulator with low IQ and enable

Data sheet: PDF | HTML
Precision ADCs

ADS122C0424-bit, 2-kSPS, 4-ch, low-power, small-size delta-sigma ADC with PGA, VREF, 2x IDACs & I2C interface

Data sheet: PDF | HTML
Precision ADCs

ADS122U0424-bit, 2-kSPS, 4-ch, low-power, small-size delta-sigma ADC w/ PGA, VREF, 2x IDACs & UART interface

Data sheet: PDF | HTML

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Technical documentation

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Type Title Date
* Design guide High-Precision Temperature Measurement for Heat and Cold Meters Reference Design Nov. 28, 2017
Technical article Water-flow metering with an ADC approach PDF | HTML Nov. 30, 2017
Technical article Using ultrasonic technology for flow measurement PDF | HTML Sep. 26, 2017

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