EVALSTPM-3PHISO

EVALSTPM-3PHISO Data brief Three-phase full shunt electricity meter evaluation board based on STPMS2, STISO621W and STM32F413RH Features • • • • • • • • • • • • • • Product status link EVALSTPM-3PHISO Compliant to EN 50470-x, IEC 62053-2x, ANSI12.2x standard requirements for AC watt meters Active wideband, active fundamental, reactive and apparent power/energy calculation for each phase and cumulative Accuracy Class 0.5 according to IEC 62053-22 on 3-ph active/apparent power measurement Accuracy Class 1 according to IEC 62053-21 on 3-ph reactive power measurement 6 channels voltage and current decimated samples available @200 us 5 kHz measurement bandwidth RMS and THD (optional) calculation of each voltage and current signal Selectable high pass filter for DC measurement Line period and phase shift measurement for each phase Phase voltage delays Full calibration (amplitude, power offset and samples offset for DC measurement) Two configurable LED for pulsed outputs Communication through USB in virtual com port mode with shell commands 6 kV galvanic isolation between the phases with 8 mm creepage and clearance Description The EVALSTPM-3PHISO evaluation board implements a complete three-phase energy meter with low-cost shunt current sensors. The solution is based on the STPMS2 device, a double channel, 24-bits second order sigma-delta modulator, measuring voltage and current for each phase through a voltage divider and a shunt current sensor. Sensing circuitry and PCB layout are optimized to maximize signal-to-noise ratio for optimal accuracy. The STPMS2 oversamples the signal using a 4 MHz clock distributed in a synchronized way by the microcontroller and outputs voltage and current sigma-delta bitstreams, multiplexed on the same pin. The two-wire communication between STPMS2 modulator and MCU is isolated by STISO621W, 6 kV galvanic isolated interface, allowing up to 100 Mbps rate and low pulse distortion (