STMicroelectronics X-NUCLEO-IHM01A1

Overview

X-NUCLEO-IHM01A1 from STMicroelectronics is a stepper motor driver expansion board based on the L6474 IC, designed for integration with STM32 Nucleo development platforms. It supports 8–45 V supply voltage, delivers up to 3 A_r.m.s. phase current, enables up to 1/16 microstepping, and includes Power OK/fault LEDs and SPI-based control for precise motion sequencing in embedded motion control applications.

For engineers reviewing the X-NUCLEO-IHM01A1 datasheet, X-NUCLEO-IHM01A1 pinout, X-NUCLEO-IHM01A1 application, or X-NUCLEO-IHM01A1 equivalent, key selection criteria include Arduino UNO R3 connector compatibility, multi-board stacking capability for up to three motors, L6474-based advanced current control, and integrated protection features for industrial-grade stepper actuation.

Technical Context

The board implements the L6474 stepper motor driver IC in a fully protected power stage with overcurrent, thermal shutdown, and undervoltage lockout. Its SPI interface (SDI/SDO/SCK/CS) enables real-time parameter configuration including acceleration/deceleration profiles, microstepping resolution, and current regulation thresholds.

Designed for stackable deployment, it uses dual 2×19 male headers (CN7/CN10) aligned with STM32 Nucleo pin mapping and includes dedicated DIR/PWM/FLAG signals per motor channel, supporting coordinated multi-axis motion control without external logic.

Key Specifications

Availability

X-NUCLEO-IHM01A1 is available at Aetrix Electronics and suitable for industrial automation prototyping, robotics actuation subsystems, and laboratory motion control test benches requiring stable component supply and rapid evaluation-to-deployment cycles.

Supply support for X-NUCLEO-IHM01A1 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, specializing in microcontrollers, power management, and motion control solutions for industrial, automotive, and consumer markets.

The X-NUCLEO expansion board series targets rapid prototyping of STM32-based systems, with the IHM01A1 specifically engineered to simplify stepper motor integration using ST's proprietary L6474 driver architecture.

FAQ

Does X-NUCLEO-IHM01A1 support multiple stepper motors simultaneously?

No - each X-NUCLEO-IHM01A1 drives one bipolar stepper motor. However, up to three identical boards can be stacked on a single STM32 Nucleo board using its Arduino-compatible headers and shared SPI bus, enabling synchronized control of three independent motors via software-defined channel addressing.

What protection features are implemented on the board?

The board inherits full protection from the L6474 IC: non-dissipative overcurrent detection, thermal shutdown, undervoltage lockout, and short-circuit protection on both high- and low-side power stages. These are hardware-enforced and reported via the FLAG pin and onboard fault LED.

Is external power required, and how is it connected?

Yes - an external 8–45 V DC supply must be connected to the VIN header (CN3, pins 1–2). The board does not draw power from the Nucleo's 5 V or 3.3 V rails for motor operation; only logic-level signals and SPI communication are powered by the host Nucleo board.

Can this board be used with non-ST microcontrollers?

Yes - while optimized for STM32 Nucleo, the board's SPI interface and standard Arduino UNO R3 pinout allow use with any MCU supporting 3.3 V logic levels and SPI master mode. Signal timing and register mapping must follow the L6474 datasheet, and external level-shifting may be needed for 5 V-only hosts.