Stepper Motor System with Medium Torque Drive
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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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Schematic/Block Diagram

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DRV8818EVM :
DRV8818 Evaluation Module


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TI Devices (2)

Order samples, get tools and find more information on the TI products in this reference design.

Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
MSP430F2617  16 MHz MCU with 92KB Flash, 8KB SRAM, 12-bit ADC, Dual 12-bit DAC, I2C/SPI/UART, HW multiplier, DMA  Microcontrollers (MCUs)  Sample & Buy View Design Kits & Evaluation Modules
TPS777  750-mA, 10-V, low-dropout voltage regulator with enable & RESET with delay  Power management  Sample & Buy Not Available

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
MSP430F2617 Download Download
Download Download
(ZQW) | 113 Download -
TPS777 Download

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Technical documentation

See the Important Notice and Disclaimer covering reference designs and other TI resources.

User guide (1)
Title Type Size (KB) Date
PDF 1450 05 Nov 2013
Design files (3)
Title Type Size (KB) Date
PDF 38 05 Nov 2013
PDF 409 05 Nov 2013
ZIP 656 05 Nov 2013
Related Tools & Software

Hardware development (1)

Name Part Number Tool Type
DRV8818 Evaluation Module  DRV8818EVM  Evaluation board 

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