Stepper Motor System with Medium Torque Drive


Design files


This bipolar stepper motor system implements an MSP430, a DRV8818, and a NEMA 23 motor.  It's suitable for applications requiring up to 140 oz-in of torque, and up to 800 RPM.  Motor voltage support is 8V to 35V, and max current is 2.5A.  A multitude of configuration options allow fine tuning of the current waveform, including the regulated current level, the microstepping applied, H-bridge FET states during current decay, the time interval of current decay, and current deglitch time.  The motor drive stage has integrated protection from short-circuit, shoot-through, under-voltage, and over-temperature.

  • Highly configurable current waveform allows maximum tunability
  • Integrated power FETs support 8V to 35V and 2.5A
  • Motor speed is easily controlled by the STEP frequency
  • Hardware state machine modulates current with up to 1/8 microstepping for a smooth motion profile
  • Integrated protection for short-circuit, shoot-through, under-voltage, and over-temperature



Motor must be ordered through the manufacturer

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Design files & products

Design files

Download ready-to-use system files to speed your design process.

TIDU149.PDF (1508 K)

Test results for the reference design, including efficiency graphs, test prerequisites and more

TIDC013.ZIP (656 K)

Detailed schematic diagram for design layout and components

TIDR284.PDF (409 K)

Detailed schematic diagram for design layout and components

TIDR285.PDF (38 K)

Complete listing of design components, reference designators, and manufacturers/part numbers


Includes TI products in the design and potential alternatives.

Linear & low-dropout (LDO) regulators

TPS777750-mA, 10-V, low-dropout voltage regulator with enable & RESET with delay

Data sheet: PDF
MSP430 microcontrollers

MSP430F261716 MHz MCU with 92KB Flash, 8KB SRAM, 12-bit ADC, Dual 12-bit DAC, I2C/SPI/UART, HW multiplier, DMA

Data sheet: PDF | HTML

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Evaluation board

DRV8818EVM — DRV8818 Evaluation Module

The DRV8818 evaluation module (EVM) demonstrates the capabilities and performance of the DRV8818 integrated micro-stepping motor driver from Texas Instruments. This EVM comes with an on-board MSP430 microprocessor which has been pre-programmed for standalone operation. The regulated voltage for the (...)

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Technical documentation

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Test report TIDA-00111 Test Results Nov. 05, 2013

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