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STMicroelectronics STISO621

STISO621 - Dual channel digital isolator

The STISO621 are dual-channel digital isolators based on the ST thick oxide galvanic isolation technology. The devices provide two independent channels in opposite direction with Schmitt trigger input, providing robustness to noise and high speed input/output switching time.

Features

Dual channel, digital isolator with 1 – 1 channel directionality
High data rate up to 100 Mbps
Wide Ta range operation: - 40ºC to 125ºC
High common-mode transient: >50k V/µs
From 3 V to 5.5 V supply levels
3.3 V and 5 V level translation
Low power consumption
Pulse width distortions < 3 ns
6k V Galvanic isolation
SO8 narrow and wide package options

Applications

Commercial Battery Storage Systems
Fire Alarm, Smoke Detector and Air Quality Monitor
Gas Metering
Heat Metering
Single Phase Meter
Solar Inverters (String and Central)
Water Metering

EVALSTISO62XV1 - Dual channel digital isolator evaluation board

The EVALSTISO62XV1 allows a complete evaluation of the dual channel digital isolators of the STISO family. Based on ST’s thick oxide galvanic isolation technology, the STISO digital isolators feature high speed communication and reduced high speed distortion.

Features

Dual channel digital isolator
Supply voltage up to 5 V
SO8 and SO8 wide package
6k V galvanic isolation technologyDetails about isolation parameters are available in the specific part number’s datasheet

STMicroelectronics EVALSTISO62XV evaluation board – top side

BUY ONLINE AT AVNET EMEA

EVALSTPM-3PHISO - Three-phase full shunt electricity meter evaluation board based on STPMS2, STISO621W and STM32F413RH

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 (<3ns) for safe and fast data transfer between isolated domains.

The FW embedded in the solution exploits the DFSDM filters of the STM32F413RH to convert the six bitstreams into 24-bits voltage and current data, at 200 us rate. All the metrology parameters are computed real time on a 200 us basis.

Two LEDs are available for active and reactive pulses generation.

The FW also implements a virtual com port communication to easily access the internal parameters to read metrology data, to modify the internal configuration for a high flexibility of the application, and to calibrate the board.

Features

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
2.5 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