High Precision Temperature Measurement for Heat and Cold Meters Reference Design

1 января 2018

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.

Особенности

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)