The smallest 45 V / 256 microsteps motor driver

Tuesday, February 20, 2018


The STSPIN820 is the smallest 45 V motor driver in the world that can achieve a resolution of up to 256 microsteps. To achieve a high resolution of 256 microsteps, ST had to develop an advanced and precise PWM current control algorithm. ST’s advanced algorithms are able to keep the torque ripples under control, the motor driver is capable of reducing the noise generated by the motor to come close to a BLDC motor.


ST’s portfolio of STSPIN stepper motor drivers spans from relatively simple ICs with current control and phase generation to more complex solutions that combine in a single chip all that is needed to autonomously drive a stepper motor using high-level motion commands coming from the motor or motion control system host – a microcontroller, DSP or FPGA.


Available in a large selection of space-saving, thermally-enhanced packages, STSPIN stepper motor drivers provide a ready-to-use, optimised solution for motor and motion control systems in a range of voltage and current ratings.


ST also offers a system-in-package (powerSTEP01) integrating both the control circuitry and a complete power stage (8 N-channel 16 mOhm MOSFETs) in a QFN package for compact, high-power stepper motor applications (85 V and 10 A).


The STSPIN portfolio comes with extensive low-cost evaluation hardware and software as well as a technical documentation toolbox to help minimize time to market.


The STSPIN820 is a stepper motor driver which integrates, in a small QFN 4 x 4 mm package, both control logic and a low RDSon power stage.


The integrated controller implements a PWM current control with fixed OFF time and a microstepping resolution up to 1/256th of the step.


The device can be forced into a low consumption state.


The device offers a complete set of protection features including overcurrent, overtemperature and short-circuit protection.


Key Features

  • Operating voltage from 7 to 45 V
  • Maximum output current 1.5 Arms
  • RDSon HS + LS = 1 Ω typ.
  • Microstepping up to 1/256th of step
  • Current control with programmable OFF time
  • Current sensing based on external shunt resistor
  • Full protection set
  • Non-dissipative overcurrent protection
  • Short-circuit protection
  • Undervoltage lockout
  • Thermal shutdown
  • Standby low consumption


For more information please contact:

Robin Scholes
Field Application Engineer
Arrow Altech Distribution
+27 (0) 83 226 6019

011 923 9600/ 011 923 9668