STMicroelectronics STEVAL-IHT005V2

Overview

STEVAL-IHT005V2 from STMicroelectronics is a demonstration board for full 3.3 V AC switch control in home appliance applications, featuring the STM32F100C4T6B MCU (32-bit, 24 MHz, 16 KB Flash), VIPer16L-based buck-boost auxiliary supply (−6 V/3.3 V), and dual high-power phase-angle control using T1635H-6T (16 A, 600 V Triac) and ACST1635-8FP (16 A, 800 V overvoltage-protected ACST).

For engineers reviewing the STEVAL-IHT005V2 datasheet, STEVAL-IHT005V2 pinout, STEVAL-IHT005V2 application, or STEVAL-IHT005V2 equivalent, this board supports IEC 61000-4-4 burst (4 kV Class A) and IEC 61000-4-5 surge (2 kV) pre-compliance testing, zero-voltage switching synchronization, soft-start power transitions, and gate current measurement via external wire loop.

Technical Context

The board implements a robust 3.3 V control architecture for AC mains interfacing, with ZVS interrupt handling synchronized to 50/60 Hz line voltage to enable precise phase-angle timing. The STM32F100C4T6B executes real-time load control logic using its 12-bit ADC, five timers, and I²C interface - all powered from the isolated −6 V/3.3 V rail generated by the VIPer16L offline converter.

High-power load control uses two independent phase-angle paths: one driving the T1635H-6T Triac (2830 W max at 264 VAC), the other the ACST1635-8FP (2050 W max), both with soft-change across five discrete power levels. Low-power control employs three ACS108-8S (0.8 A, 800 V) and one Z0109 (1 A, 600 V) for full-wave switching up to 100 W per channel.

Key Specifications

Availability

STEVAL-IHT005V2 is available at Aetrix Electronics and suitable for home appliance development, white goods control system prototyping, and IEC EMC pre-compliance validation requiring stable component supply and traceable evaluation hardware.

Supply support for STEVAL-IHT005V2 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 components for industrial, automotive, and consumer markets.

This board belongs to ST's STEVAL (ST Evaluation) series - purpose-built reference platforms that integrate ST silicon (MCUs, power switches, drivers) to accelerate design-in of robust, standards-compliant AC control solutions for home appliances.

FAQ

What is the primary function of the STEVAL-IHT005V2?

The STEVAL-IHT005V2 is a demonstration board for evaluating full 3.3 V AC switch control in home appliance applications. It implements phase-angle control for high-power loads using Triac and ACST devices, full-wave switching for low-power loads, and integrates ZVS synchronization, soft-start routines, and IEC EMC pre-compliance test readiness - all powered from an isolated VIPer16L-derived supply.

Does the board support JTAG debugging and firmware updates?

Yes - the board includes a standard 20-pin JTAG programming connector compatible with ST-LINK and other ARM Cortex-M debug tools. The STM32F100C4T6B MCU supports in-circuit debugging, flash programming, and real-time variable monitoring via SWD/JTAG, enabling rapid firmware iteration during AC control algorithm development.

How is zero-voltage switching implemented and used on this board?

ZVS is detected via a dedicated circuit that generates an interrupt signal synchronized to AC mains zero-crossing points. This signal feeds directly into the STM32F100C4T6B's external interrupt line, allowing precise timing of TRIAC/ACST firing angles. The firmware uses this event to trigger timer capture/compare operations for repeatable, jitter-free phase control across line cycles.

Can the board be used for both high- and low-power load control simultaneously?

Yes - the board supports concurrent operation of both high-power (T1635H-6T and ACST1635-8FP, up to 2830 W and 2050 W respectively) and low-power (Z0109 + 3× ACS108-8S, up to 100 W each) control channels. Independent GPIOs, dedicated driver circuits, and separate power stage layouts prevent cross-talk and allow mixed-load evaluation in single-system prototypes.