STMicroelectronics POWERSTEP01

Overview

POWERSTEP01 from STMicroelectronics is a system-in-package stepper motor driver integrating an SPI-programmable microstepping controller and dual full-bridge power stage with eight 16 mΩ N-channel MOSFETs, supporting 7.5–85 V motor supply and 10 ARMS output current. It delivers sensorless stall detection, programmable speed profiles (acceleration/deceleration/position), and up to 1/128 microstepping for precision motion control in industrial automation and robotics.

For engineers reviewing the POWERSTEP01 datasheet, POWERSTEP01 pinout, POWERSTEP01 application, or POWERSTEP01 equivalent, key selection considerations include its dual-bridge R_DS(on), integrated voltage regulators (VCC/VREG), non-dissipative overcurrent protection, thermal shutdown thresholds (155 °C bridge off), and SPI interface timing compliance at 5 Mbit/s.

Technical Context

The device implements a digital motion engine with dedicated registers for acceleration (ACC), deceleration (DEC), max/min speed, and absolute position (22-bit counter), enabling closed-loop positioning without external microcontroller intervention. Its dual full-bridge supports both voltage-mode and current-mode driving, with programmable deadtime (125–4000 ns) and blanking time (125–1000 ns) to prevent shoot-through.

Stall detection uses real-time V_DS monitoring on low-side MOSFETs with configurable threshold (31–1100 mV), while overcurrent protection employs non-dissipative comparator-based sensing referenced to SENSEA_S/SENSEB_S inputs. The internal 16 MHz oscillator (±5%) feeds PWM generation (5.6–125 kHz) and logic timing, with optional external clock input via OSCIN/OSCOUT.

Key Specifications

Pinout & Package

VFQFPN package, 11 mm × 14 mm, 64-pin with exposed thermal pad (EPAD1–EPAD13). All VS pins must be shorted externally; SENSEA1_P/SenseA2_P and SENSEB1_P/SENSEB2_P require paired routing per datasheet layout rules.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar stepper motor controller applications.

Compared with TMC5160-TA and DRV8711, POWERSTEP01 uniquely combines motion engine, dual full-bridge, and protection in one VFQFPN package-enabling single-chip stepper control without external power components or host CPU motion calculation.

Availability

POWERSTEP01 is available at Aetrix Electronics and suitable for industrial process automation, medical analysis equipment, robotics, and CCTV dome camera designs requiring stable component supply across extended product lifecycles.

Supply support for POWERSTEP01 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, designing and manufacturing microcontrollers, power management ICs, and motion control solutions for industrial and automotive markets.

POWERSTEP01 belongs to ST's intelligent motor driver product line, engineered specifically for high-voltage stepper applications demanding integrated motion control, robust protection, and minimal external components.

FAQ

What is the maximum motor supply voltage supported by POWERSTEP01?

The absolute maximum motor supply voltage (VS) is 95 V, but the recommended operating range is 7.5 V to 85 V per DS9836 Rev 8. Operation above 85 V risks exceeding safe operating area limits of the internal MOSFETs and may trigger overvoltage protection on VBOOT or VSREG rails.

How does sensorless stall detection work without current-sense resistors?

POWERSTEP01 monitors the V_DS of low-side MOSFETs during conduction using internal comparators. When motor current drops due to stall, V_DS rises sharply; the device compares this against a programmable threshold (STALL_TH register) and asserts FLAG within 230–530 ns.

Can POWERSTEP01 operate without an external crystal or oscillator?

Yes. POWERSTEP01 includes an internal 16 MHz ±5% oscillator that powers logic, PWM, and SPI timing. OSCIN/OSCOUT pins are optional; when unused, OSCIN must be grounded and OSCOUT left floating or configured as clock output for system synchronization.

What thermal protections are implemented, and how do they differ?

Three-tier thermal protection is implemented: thermal warning at 135 °C (FLAG assertion), bridge shutdown at 155 °C (outputs disabled), and full device shutdown at 170 °C. Recovery occurs at 125 °C, 145 °C, and 130 °C respectively-ensuring graceful degradation before catastrophic failure.