TIDA-01526
High Precision Temperature Measurement for Heat and Cold Meters Reference Design
TIDA-01526
Overview
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)
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
TIDCEE4.ZIP (416 K)
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
Products
Includes TI products in the design and potential alternatives.
Linear & low-dropout (LDO) regulators
LP5907 — 250-mA, low-noise, high-PSRR, ultra-low-dropout voltage regulator with low IQ and enable
Data sheetPrecision ADCs (<=10MSPS)
ADS122C04 — 24-bit, 2-kSPS, 4-ch, low-power, small-size delta-sigma ADC with PGA, VREF, 2x IDACs & I2C interface
Data sheetPrecision ADCs (<=10MSPS)
ADS122U04 — 24-bit, 2-kSPS, 4-ch, low-power, small-size delta-sigma ADC w/ PGA, VREF, 2x IDACs & UART interface
Data sheetStart development
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 | Nov. 30, 2017 | |
| Technical article | Using ultrasonic technology for flow measurement | Sep. 26, 2017 |
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