STMicroelectronics STEVAL-IHM020V1

Overview

STEVAL-IHM020V1 from STMicroelectronics is a demonstration board built around the STCC08 AC switch failure mode detector and ST7LITE39F2 MCU, enabling real-time monitoring and failure detection (open, short, diode-mode) of ACS™, ACST, and TRIACs driving 15 W resistive loads at 230 V AC, with capacitive 5 V DC power supply and mechanical fault simulation switches.

For engineers reviewing the STEVAL-IHM020V1 datasheet, STEVAL-IHM020V1 pinout, STEVAL-IHM020V1 application, or STEVAL-IHM020V1 equivalent, this board supports hands-on validation of AC switch state sensing, ZVS-triggered gate control, AVF signal analysis, and safety-critical load monitoring in white goods and industrial controls.

Technical Context

The board implements a complete functional safety demonstrator: the STCC08 monitors AC switch conduction via AVF (Analog Voltage Feedback) and ZVS (Zero Voltage Switching) signals while driving gate current up to 10 mA; the ST7LITE39F2 MCU samples AVF, interprets failure signatures, and controls ON/OFF sequencing through dedicated I/O pins.

Failure detection logic distinguishes three distinct fault modes-open circuit (no AVF), short circuit (continuous AVF high), and diode-mode (asymmetric half-wave conduction)-using analog thresholding and timing windows confirmed in UM0583; all measurements are accessible via labeled test points (TP1–TP10).

Key Specifications

Availability

STEVAL-IHM020V1 is available at Aetrix Electronics and suitable for white goods development, industrial motor control prototyping, and appliance safety certification requiring stable component supply and legacy reference design validation.

Supply support for STEVAL-IHM020V1 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, designing and manufacturing microcontrollers, power ICs, sensors, and analog devices for industrial, automotive, and consumer applications.

This board belongs to ST's STEVAL evaluation platform family, engineered specifically to accelerate adoption of ST's AC switch protection and intelligent power control solutions in safety-critical home appliances.

FAQ

What is the primary function of the STEVAL-IHM020V1 board?

The STEVAL-IHM020V1 is a functional demonstrator for AC switch failure detection using the STCC08 IC. It actively drives and monitors ACS™, ACST, or TRIAC loads, identifies open, short, and diode-mode faults in real time, and visualizes states via LEDs-all under controlled 230 V AC conditions with a 15 W bulb load.

Does the board support firmware reprogramming of the ST7LITE39F2 MCU?

Yes - the ST7LITE39F2 MCU on the board is accessible via the SWIM (Single Wire Interface Module) debug interface using standard STLINK tools. The user manual UM0583 documents pin locations (SWIM_CLK/SWIM_IO on PA0/PA1) and provides bootloader guidance for custom firmware deployment.

Can the STEVAL-IHM020V1 be used with 115 V AC mains?

No - the board's capacitive power supply and fuse (1 A) are designed exclusively for 230 V ±10% AC input. Using it at 115 V will underpower the 5 V rail and prevent proper STCC08 operation; no hardware modification is validated by ST for lower-voltage operation.

Is the STCC08 device on this board replaceable with newer alternatives?

No - the STCC08 is obsolete and not recommended for new designs. ST does not list a direct replacement; system redesign using ST's VIPower™ M0-7 family (e.g., VNI8200AJ) with integrated diagnostics is required for equivalent functionality and long-term supply assurance.