STMicroelectronics STEVAL-IHM012V1

Overview

STEVAL-IHM012V1 from STMicroelectronics is an evaluation board for cordless drill motor control, implementing a DC chopper topology with an 8-pin MCU and discrete Power MOSFET to regulate brush DC motor speed, monitor battery voltage, enforce high-current protection, and limit torque output.

For engineers reviewing the STEVAL-IHM012V1 datasheet, STEVAL-IHM012V1 pinout, STEVAL-IHM012V1 application, or STEVAL-IHM012V1 equivalent, this board serves as a reference design for low-voltage, low-cost DC motor drive systems in portable power tools requiring real-time current sensing, PWM-based speed regulation, and overcurrent fault handling.

Technical Context

The board implements a unidirectional DC chopper using a single N-channel Power MOSFET driven by an 8-pin microcontroller's PWM output, with analog feedback from a shunt resistor for current limiting and battery voltage monitoring via MCU ADC input.

Control logic resides entirely in the MCU firmware, enabling configurable torque limits and soft-start behavior; no external gate driver or dedicated motor controller IC is used - the solution relies on discrete power switching and embedded firmware execution.

Key Specifications

Availability

STEVAL-IHM012V1 is available at Aetrix Electronics and suitable for cordless drill development, screwdriver motor control prototyping, and low-voltage brushed DC motor drive validation requiring stable component supply and legacy reference design access.

Supply support for STEVAL-IHM012V1 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, Switzerland, designing and manufacturing microcontrollers, power devices, sensors, and analog ICs for industrial, automotive, and consumer applications.

This evaluation board belongs to ST's STEVAL (ST Evaluation) series, developed specifically to demonstrate cost-optimized, firmware-driven motor control solutions for entry-level cordless power tools.

FAQ

Is STEVAL-IHM012V1 still in production?

No - STEVAL-IHM012V1 is marked obsolete per ST's official documentation (Rev 1, October 2007). It remains available through authorized legacy distributors and Aetrix Electronics' extended-life inventory program for design continuity and repair support.

What motor voltage range does it support?

The board supports brushed DC motors operating from 9 V to 18 V DC, matching common NiCd/NiMH battery packs used in cordless drills. The MOSFET and shunt design are rated for peak currents up to 15 A with appropriate heatsinking and duty cycle management.

Can I replace the MCU or MOSFET with modern equivalents?

Yes - the 8-pin MCU and discrete Power MOSFET are socketed or standard footprint components. ST provides schematic and layout files, enabling substitution with pin-compatible MCUs (e.g., STM8S003F3) and logic-level MOSFETs (e.g., STP16NF06L), subject to firmware adaptation and thermal validation.

Does it include encoder or position feedback capability?

No - STEVAL-IHM012V1 implements open-loop speed control via PWM duty cycle adjustment only. It lacks encoder interface circuitry, Hall sensor inputs, or commutation logic; feedback is limited to analog current and battery voltage sensing for protection, not closed-loop velocity regulation.