STMicroelectronics STEVAL-IHM043V1

Overview

STEVAL-IHM043V1 from STMicroelectronics is a 6-step sensorless BLDC motor driver demonstration board built around the STM32F051 microcontroller and L6234 three-phase motor driver IC. It operates from 7–42 VDC input, delivers 2 A continuous (5 A peak) motor current, supports 100% duty cycle operation, and implements closed-loop commutation without Hall sensors for permanent magnet motors.

For engineers reviewing the STEVAL-IHM043V1 datasheet, STEVAL-IHM043V1 pinout, STEVAL-IHM043V1 application, or STEVAL-IHM043V1 equivalent, key selection considerations include input voltage range compatibility, sensorless commutation algorithm implementation, integrated MCU firmware support, and L6234-based inverter stage layout for thermal and EMI validation.

Technical Context

The board implements a digital control loop where the STM32F051 executes real-time back-EMF sensing and 6-step commutation logic, generating PWM and enable signals for the L6234 power stage. Motor phase voltages are sampled via on-board resistive dividers to detect zero-crossing events without external sensors.

Power delivery uses the L6234's integrated high-side/low-side gate drivers and DMOS output stages, with internal current limiting and thermal shutdown. The ST78L33 linear regulator supplies stable 3.3 V to the MCU and logic circuitry, decoupled by ceramic capacitors per layout guidelines.

Key Specifications

Availability

STEVAL-IHM043V1 is available at Aetrix Electronics and suitable for BLDC motor control validation, embedded motion algorithm development, and industrial actuator prototyping requiring stable component supply and documented reference design traceability.

Supply support for STEVAL-IHM043V1 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, analog devices, and MEMS sensors for industrial, automotive, and consumer applications.

This board belongs to ST's STEVAL (ST Evaluation) series-reference designs intended to accelerate hardware validation and firmware development for motor control, power conversion, and sensor interface subsystems.

FAQ

Does STEVAL-IHM043V1 support encoder-based position feedback?

No. The board implements only sensorless 6-step commutation using back-EMF zero-crossing detection. It lacks encoder interface circuitry (e.g., quadrature inputs, index pulse handling) or firmware support for incremental or absolute encoders. Position estimation is derived solely from motor phase voltage sampling.

What firmware is preloaded on the STM32F051?

The board ships with factory-programmed firmware implementing sensorless 6-step BLDC control, including startup sequence, back-EMF acquisition, commutation state machine, and overcurrent/thermal fault response. Source code and Keil/IAR project files are provided in the STSW-STM32109 software package.

Can the L6234 be replaced with a higher-current driver IC?

Not without PCB redesign. The L6234 is surface-mounted in a PowerSO-36 package with specific thermal pad layout, gate drive routing, and current-sense resistor placement. Substitution would require matching pinout, voltage rating, current capability, and thermal dissipation characteristics-none of which are drop-in compatible with standard alternatives.

Is the board RoHS compliant and REACH certified?

Yes. As stated in the data brief, STEVAL-IHM043V1 is RoHS compliant (2011/65/EU). ST provides full material declarations and REACH SVHC statements via its official product page and compliance portal, confirming absence of substances above threshold concentrations.