STSPIN840

STSPIN840 is STMicroelectronics’ compact stepper motor driver in the STSPIN family. It integrates the power stage (high‑efficiency MOSFETs) and control logic to drive a two‑phase stepper motor in a single device, simplifying motion‑control designs. The driver offers adjustable current regulation and microstepping with configurable resolution and includes protective features such as overcurrent, overtemperature, and undervoltage. Some variants provide sensorless stall detection (StallGuard) and can be controlled via simple STEP/DIR interfaces or a more advanced serial interface for configuration. Applications include 3D printers, CNC machines, robotics, and other compact motor drives. ST provides reference designs, evaluation boards, and software libraries to speed integration. In short: a versatile, integrated motor driver for efficient, compact stepper control with built‑in protection and scalable control options.

STSPIN840 is STMicroelectronics’ integrated dual 2‑phase stepper motor driver. There isn’t an exact one-to-one replacement; comparable alternatives from other vendors include TI DRV8825/DRV8811, Allegro A4988 (and A4989), and Trinamic TMC2130/TMC2209. When substituting, verify identical motor current rating, microstep resolution, voltage range, interface (step/dir, PWM, or SPI), and package/pinout.

STSPIN840 features (concise):
- High-current, fully integrated driver for bipolar stepper motors with dual full-bridge outputs
- Current regulation with external sense resistor; adjustable RMS/peak current
- Microstepping up to 256 microsteps per full step for smooth, quiet motion
- PWM current control with selectable decay modes (slow/fast/mixed)
- Stall/hold detection and torque management for reliable starting and stopping
- Comprehensive protections: overcurrent, overtemperature, undervoltage, short-to-GND, thermal shutdown
- Diagnostics and fault reporting for easy fault handling
- Standard STEP/DIR control interface (with ENABLE) plus options for advanced configuration
- Suitable for compact applications with efficient thermal performance
Note: exact current ratings and interface options may vary by revision; consult the latest datasheet for precise figures.

- Pin count: 28 pins (in the common package for STSPIN840).
- Function: A 3-phase brushless DC motor driver IC with an integrated three-half-bridge power stage (MOSFETs) and driver logic for BLDC motor commutation. It accepts PWM/input signals, supports sensorless or Hall-sensor feedback, and includes protection and current-regulation features.

Manufacturer: STMicroelectronics (ST).
What kind of company: A multinational semiconductor company that designs, manufactures, and markets electronics components and ICs; one of the world’s largest semiconductor manufacturers, headquartered in Geneva, Switzerland (French-Italian origins).

STSPIN840 is a compact, three‑phase motor driver with integrated power stage for precise current-controlled motor drive (stepper/BLDC). Typical application areas:
- Precision motion: 3D printers, CNC machines, robotics, pick-and-place and packaging equipment
- Home appliances and HVAC actuators (valves, dampers, fans)
- Medical devices requiring accurate positioning or speed control (pumps, actuators)
- Automotive and industrial automation actuators (seat/mirror adjusters, valve control)
- Educational/hobby robotics and DIY projects

STSPIN840 is available in a 28-pin HTSSOP package (HTSSOP-28), typically with an exposed pad.