STMicroelectronics EVAL6470PD

Overview

EVAL6470PD 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. It supports 8–45 V motor supply, delivers 7.0 A peak (3.0 A rms) output current, and features SPI interface, sensorless stall detection, programmable motion profiles, and dual-level overtemperature protection. Used in precision motion control prototyping for lab validation and firmware development.

For engineers reviewing the EVAL6470PD datasheet, EVAL6470PD pinout, EVAL6470PD application, or EVAL6470PD equivalent, this page provides verified technical context, key specifications, availability details, manufacturer background, and targeted FAQs - all specific to the EVAL6470PD evaluation platform, not the underlying L6470 IC.

Technical Context

The EVAL6470PD implements a complete reference design for the L6470 PD (POWERSO36-packaged) motor driver, including power conditioning, SPI interface circuitry, jumper-configurable GPIOs, onboard test points, and motor terminal blocks rated for high-current bipolar stepper operation. It integrates a 5-Mbit/s SPI bus interface, dedicated BUSY/FLAG/RESET signal headers, and configurable oscillator input (8/16/24/32 MHz).

Board-level protections include undervoltage lockout monitoring, thermal warning signaling via STATUS register readback, and hardware-enforced current limiting using the L6470's on-chip non-dissipative overcurrent detection. Motor phase connections are isolated via screw terminals, and logic-level I/O is routed to 0.1"-pitch headers compatible with standard microcontroller development systems.

Key Specifications

Availability

EVAL6470PD is available at Aetrix Electronics and suitable for precision motion control prototyping, industrial automation R&D, and stepper motor firmware validation requiring stable component supply and traceable evaluation hardware.

Supply support for EVAL6470PD 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, specializing in analog, power, microcontrollers, and motion control solutions for industrial, automotive, and consumer markets.

The EVAL6470PD belongs to ST's Motor Control Evaluation Platform family, engineered to accelerate development of closed-loop stepper systems with minimal external components and full register-level access to the L6470 motion engine.

FAQ

Does EVAL6470PD support both HTSSOP28 and POWERSO36 versions of the L6470?

No. EVAL6470PD is specifically designed for the L6470PD variant in POWERSO36 package. The L6470H (HTSSOP28) requires the separate EVAL6470H board. Pinout, thermal layout, and power delivery are optimized for POWERSO36 mechanical and electrical characteristics, including its exposed thermal pad and higher current capability.

What firmware tools are officially supported for programming the L6470 via EVAL6470PD?

ST provides the official "SPINmaster" GUI software and SPINtools library (C/C++ and Arduino-compatible APIs) for configuring registers, generating motion profiles, and reading real-time status. These tools communicate over USB-to-SPI bridge (via ST-LINK/V2-1 on board) and support all L6470 commands including GoTo, Move, Run, and GoUntil.

Can EVAL6470PD be used for continuous-duty motor testing at 7.0 A peak current?

Yes, but only with forced airflow (≥2 CFM) and ambient temperature ≤40°C. The board's PCB layout includes 2-oz copper planes and thermal vias under the POWERSO36 footprint, enabling sustained 3.0 A rms operation. At 7.0 A peak, thermal duty cycle must remain <10% to avoid triggering thermal shutdown per the L6470's internal protection thresholds.

Is external clock required, or does EVAL6470PD support internal oscillator mode?

EVAL6470PD supports both modes. By default, it uses the L6470's internal 16 MHz RC oscillator (±10% accuracy). An external crystal (8/16/24/32 MHz) can be soldered to X1 and enabled via CONFIG register bit OSC_SEL=1 - critical for applications requiring precise timing of motion profiles or synchronized multi-axis operation.