STMicroelectronics STEVAL-IHM007V1

Overview

STEVAL-IHM007V1 from STMicroelectronics is a universal motor control starter kit implementing phase-angle partialization for AC universal motors, featuring capacitive power supply, zero-crossing detection, current sensing, dual speed sensor interfaces (Hall/tachometer), and integrated ST7LITE05 microcontroller-based control logic. It supports both open-loop and closed-loop (PI) control via PC GUI.

For engineers reviewing the STEVAL-IHM007V1 datasheet, STEVAL-IHM007V1 pinout, STEVAL-IHM007V1 application, or STEVAL-IHM007V1 equivalent, this evaluation board enables rapid prototyping of phase-controlled universal motor drives in power tools, kitchen appliances, and HVAC blowers - with real-time firing angle, current, and speed monitoring.

Technical Context

The kit implements analog zero-crossing detection using resistor-diode networks feeding PB5 of the ST7LITE05 MCU, enabling precise synchronization of triac gate triggering. Current sensing uses a 0.047 Ω, 5 W shunt resistor with TS1851ID op-amp amplification and filtering before ADC input.

Phase-angle control is executed in firmware on the ST7LITE05 (8-bit, 8 KB Flash, 384 B RAM), with PWM outputs driving an ACST8 triac via BC547B transistor buffer. Speed feedback is supported via Hall-effect or tachometer inputs, processed by dedicated hardware timers and interrupt routines.

Key Specifications

Availability

STEVAL-IHM007V1 is available at Aetrix Electronics and suitable for universal motor drive development, phase-angle control prototyping, and appliance motor control validation requiring stable component supply and legacy reference design continuity.

Supply support for STEVAL-IHM007V1 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 devices, sensors, and analog ICs for industrial, automotive, and consumer applications.

This kit belongs to ST's STEVAL motor control evaluation platform family, developed to accelerate adoption of ST's 8-bit and 32-bit MCUs in cost-sensitive, high-volume universal motor applications with minimal external components.

FAQ

What microcontroller is used on the STEVAL-IHM007V1 main board?

The main board integrates the ST7LITE05 microcontroller - an 8-bit device with 8 KB Flash memory, 384 B RAM, and built-in analog peripherals including ADC, timers, and I/O ports configured for zero-crossing detection, current sensing, and triac gating. Its clock runs from an internal RC oscillator calibrated to ±1%.

Does the kit support closed-loop speed control?

Yes - the STEVAL-IHM007V1 supports closed-loop speed control using either Hall-effect or tachometer feedback. The PC GUI allows configuration of PI controller parameters (Kp, Ki, setpoint), and real-time speed data is displayed alongside firing angle and current waveforms during operation.

How is isolation achieved between mains and logic circuits?

Isolation is implemented via two methods: (1) optocouplers (SFH615A) for RS-232 communication lines (TXD/RXD/CTS), and (2) an NME0505D isolated DC/DC converter generating +5 V for the MCU and analog circuitry from the capacitive dropper supply - providing reinforced insulation per IEC 60747-5-5.

Can the STEVAL-IHM007V1 drive motors other than universal types?

No - the hardware and firmware are specifically designed for universal (AC series) motors. The phase-angle control topology, zero-crossing detection circuit, and triac driver stage are optimized for commutator-type motors with inductive-resistive loads and bidirectional conduction requirements, not for BLDC, PMSM, or induction motors.