Evaluation board combines sensors and galvanic isolation
Summary
The EVALSTPM-3PHISO evaluation board combines the high-accuracy STPMS2 metering front-end IC and the advanced STISO621 digital isolator, with customisable turn-key firmware running on an STM32 microcontroller to compute metrology and power-quality data. The sensing circuitry and PCB layout are optimised to ensure robustness against EMI and a strong signal-to-noise ratio, for high-accuracy measurement and post-processing computation. It then oversamples the signal using a synchronised 4MHz clock distributed by the microcontroller and multiplexes voltage and current sigma-delta bitstreams on a single output pin. The provided firmware leverages digital filters for sigma-delta modulators (DFSDMs) integrated in the chosen STM32 microcontroller to convert the six bitstreams into 24-bit voltage and current values and computes all metrology data in real-time every 200µs. The STISO621 features two independent channels with Schmitt-trigger inputs that ensure high noise immunity and keeps pulse distortion below 3ns.
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