High Precision Temperature Measurement for Heat and Cold Meters Reference Design
TIDA-01526
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Key Document

Description

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.

Features
  • 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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Schematic/Block Diagram

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Design Guide

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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
ADS122C04  24-bit, 2-kSPS, 4-ch, low-power, small-size delta-sigma ADC with PGA, VREF, 2x IDACs & I2C interface  Analog-to-digital converters (ADCs)  Sample & Buy View Design Kits & Evaluation Modules
ADS122U04  24-bit, 2-kSPS, 4-ch, low-power, small-size delta-sigma ADC w/ PGA, VREF, 2x IDACs & UART interface  Analog-to-digital converters (ADCs)  Sample & Buy View Design Kits & Evaluation Modules
LP5907  250-mA ultra-low-noise low-IQ low-dropout (LDO) linear regulator  Power management  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
ADS122C04 Download Download
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ADS122U04 Download Download
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LP5907 Download Download
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Technical Documents

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User guides (1)
Title Type Size (KB) Date
PDF 1705 28 Nov 2017
Design files (6)
Title Type Size (KB) Date
ZIP 416 22 Dec 2017
ZIP 618 22 Dec 2017
PDF 511 22 Dec 2017
PDF 121 22 Dec 2017
PDF 66 22 Dec 2017
PDF 263 22 Dec 2017
Related Tools & Software

Design Kits & Evaluation Modules  ( 1 )

Name Part Number Tool Type
MSP430FR6047 Ultrasonic Sensing Evaluation Module  EVM430-FR6047  Evaluation Modules & Boards 

Software (2)

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


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