High Precision Temperature Measurement for Heat and Cold Meters Reference Design
TIDA-01526
This product has been released to the market and is available for purchase. For some products, newer alternatives may be available.
This product has been released to the market and is available for purchase. For some products, newer alternatives may be available.
See the Important Notice and Disclaimer covering reference designs and other TI resources.
Key Document
- High-Precision Temperature Measurement for Heat and Cold Meters Reference Design
(PDF 1705 KB)
28 Nov 2017
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)
See the Important Notice and Disclaimer covering reference designs and other TI resources.
