STMicroelectronics EVAL6470H

Overview

EVAL6470H from STMicroelectronics is an evaluation board for the L6470 fully integrated microstepping motor driver IC, designed to drive two-phase bipolar stepper motors with up to 1/128 microstepping resolution, 7.0 A peak output current (3.0 A r.m.s.), and SPI-based motion engine control. It supports sensorless stall detection, programmable speed profiles, and non-dissipative overcurrent protection - enabling rapid prototyping of precision motion systems in lab and bench environments.

For engineers reviewing the EVAL6470H datasheet, EVAL6470H pinout, EVAL6470H application, or EVAL6470H equivalent, this board provides immediate hardware validation of L6470-based motor control firmware, SPI register configuration, stall detection tuning, and thermal behavior under real load conditions - critical for medical pumps, lab automation stages, and compact CNC subsystems.

Technical Context

The EVAL6470H implements the full L6470 reference design, including HTSSOP28-mounting footprint, external 8–45 V motor supply interface, on-board 3.3 V logic regulator, SPI header (compatible with STM32 Nucleo and generic MCU debug probes), and configurable jumpers for BUSY/SYNC/FLAG signal routing. It exposes all L6470 control pins - including STEP/DIR emulation support via onboard pushbuttons and LED status indicators for ALARM, BUSY, and STEP pulses.

It integrates a dedicated charge pump circuit for high-side gate driving, supports external clock input (1–32 MHz) or internal oscillator, and enables direct measurement of phase current waveforms via test points at each H-bridge output. The board includes thermal pads and heatsink mounting provisions aligned with the L6470's POWERSO36 and HTSSOP28 thermal requirements.

Key Specifications

Availability

EVAL6470H is available at Aetrix Electronics and suitable for medical infusion pumps, automated optical alignment systems, and compact 3D printer extruder modules requiring stable component supply, quick-turn evaluation, and production-ready reference design validation.

Supply support for EVAL6470H 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 specializing in power management, motion control, and embedded processing solutions for industrial, automotive, and consumer applications.

The EVAL6470H belongs to ST's Motor Control Evaluation Kit product line, developed to accelerate adoption of intelligent, integrated motor drivers by providing complete hardware + firmware reference platforms for SPI-configurable motion engines.

FAQ

Does EVAL6470H support both HTSSOP28 and POWERSO36 versions of the L6470?

No - EVAL6470H is specifically designed for the L6470H (HTSSOP28) variant. Its PCB layout, thermal pad, and pin pitch match the 28-pin HTSSOP package only. The POWERSO36 version (L6470PD) requires a different evaluation board (EVAL6470PD) due to distinct mechanical and thermal interface requirements.

Can EVAL6470H be used with Arduino or Raspberry Pi without STM32 hardware?

Yes - the board features standard 0.1″ SPI headers (MOSI, MISO, SCK, CS) and 3.3 V logic-level compatibility. Users can interface it directly with Arduino (using level-shifted SPI) or Raspberry Pi (via native 3.3 V GPIO), provided custom firmware implements L6470 register mapping and motion command sequencing per ST's AN4329 application note.

What firmware tools are officially supported for EVAL6470H?

ST provides the X-CUBE-MCSDK (Motor Control SDK) with dedicated L6470 HAL drivers, STM32CubeMX configuration support, and GUI-based evaluation software (eMotion Studio) that communicates with EVAL6470H via USB-to-SPI bridge. No proprietary debugger is required - standard ST-LINK/V2 or CMSIS-DAP adapters work out-of-box.

Is external cooling required for continuous 7.0 A operation on EVAL6470H?

Yes - sustained 7.0 A peak current demands active airflow or heatsink attachment to the L6470H's exposed thermal pad. The board includes M2.5 screw holes and thermal vias aligned with the HTSSOP28 package; ST's thermal simulation data (DocID16737 Rev 7, Section 2.3) confirms >60°C junction rise above ambient at full load without forced convection.