STMicroelectronics X-NUCLEO-IHM05A1

Overview

X-NUCLEO-IHM05A1 from STMicroelectronics is a bipolar stepper motor driver expansion board built around the L6208 dual H-bridge IC, designed for direct integration with STM32 Nucleo development platforms. It supports 8–50 V supply voltage, delivers up to 2.8 A r.m.s. phase current, and implements dual independent PWM current control with selectable fast/slow decay modes for precise microstepping control in motion-control prototyping.

For engineers reviewing the X-NUCLEO-IHM05A1 datasheet, X-NUCLEO-IHM05A1 pinout, X-NUCLEO-IHM05A1 application, or X-NUCLEO-IHM05A1 equivalent, key selection criteria include Arduino UNO R3 connector compatibility, STM32 Nucleo board stacking capability, L6208-based dual-channel current regulation, and hardware-level half/full-step decoding logic without host MCU intervention.

Technical Context

The board implements the L6208's native stepper control architecture: two fully independent PWM current controllers per phase, with dedicated VREFA/VREFB inputs setting peak current thresholds, and HARDWARE-based step mode decoding (via HALF/FULL, CW/CCW, CLOCK pins) eliminating firmware overhead. Current sensing uses low-value shunt resistors (R1/R2 = 0.3 Ω) feeding SENSEA/SENSEB inputs.

Thermal protection triggers automatic shutdown when die temperature exceeds safe limits; overcurrent detection is implemented via internal comparators monitoring sense voltage against VREF thresholds. The board accepts external power via screw terminal (B+/B−) and provides isolated motor output terminals (A+/A−, B+/B−) with flyback diode protection (D1–D5).

Key Specifications

Availability

X-NUCLEO-IHM05A1 is available at Aetrix Electronics and suitable for industrial automation prototyping, laboratory motion-control validation, and educational robotics projects requiring stable component supply and rapid STM32-based motor control deployment.

Supply support for X-NUCLEO-IHM05A1 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, analog ICs, power devices, and MEMS sensors for industrial, automotive, and consumer applications.

The X-NUCLEO series targets rapid prototyping of STM32-based systems, with the IHM05A1 specifically engineered to simplify bipolar stepper motor integration using standardized form factors and hardware-accelerated control logic.

FAQ

What microcontroller platforms is the X-NUCLEO-IHM05A1 compatible with?

The board is natively designed for STM32 Nucleo development boards and features dual compatibility with Arduino UNO R3 pinout and ST Morpho headers. It requires no additional level-shifting or adapter hardware when used with STM32 Nucleo boards such as NUCLEO-F401RE or NUCLEO-L476RG, and supports stacking with other X-NUCLEO expansion boards via shared connectors.

Does the X-NUCLEO-IHM05A1 support microstepping?

No - the X-NUCLEO-IHM05A1 implements only full-step and half-step modes via hardware decoding (HALF/FULL, CW/CCW, CLOCK inputs). Microstepping requires external current interpolation circuitry or a different driver IC; the L6208 on this board does not provide microstep logic or细分 current control beyond the two discrete step modes.

How is current limiting set on the X-NUCLEO-IHM05A1?

Phase current is set by adjusting the reference voltages VREFA and VREFB applied to pins 9 and 26 of the L6208. On this board, VREF is derived from onboard potentiometers (R15, R11) or external DACs; the 0.3 Ω sense resistors (R1, R2) convert target current into ~0.84 V full-scale sense voltage for 2.8 A r.m.s., per L6208's I_OUT = V_REF / (5 × R_SENSE) formula.

Can the X-NUCLEO-IHM05A1 drive unipolar stepper motors?

No - it is strictly a bipolar stepper motor driver. The L6208 is a dual H-bridge IC with four high-current outputs (OUT1A/OUT1B/OUT2A/OUT2B) configured for bidirectional current flow through two motor windings. Unipolar motors require center-tapped windings and single-polarity switching, which this board's topology and firmware interface do not support.