L99SM81V-based stepper motor driver evaluation board for automotive applications

AEK-MOT-SM81M1

Overview

The AEK-MOT-SM81M1 evaluation board is designed to drive a bipolar stepper motor in micro-stepping mode, with coil voltage monitoring for stall detection.

This application board features the automotive-grade L99SM81V stepper motor driver with embedded power MOSFETs and a comprehensive set of I/Os for MCU control and feedback signaling using SPI communication through a 12-pin male connector or two 5-pin connectors on the board.
The board is developed as part of the AutoDevKit initiative, and evaluation firmware is available for suitable microcontrollers such as the automotive-grade SPC5 series MCU on the AEK-MCU-C4MLIT1 control board.

Main features

Board functionality based on L99SM81V programmable stepper motor driver for automotive applications:
- with micro-stepping and hold functions
- BEMF monitoring for stall detection
- programmable configuration via SPI
- 5 V internal linear voltage regulator (output available on board connector)
Board reverse battery protection with STD95N4F3 MOSFET, which can be substituted with two optionally mounted diodes and a jumper
Input operating voltage range from 6 V to 28 V
Output current up to 1.35 A
Board size: 65 mm length x 81 mm width x 11 mm maximum component height
WEEE and RoHS compliant
All ST components are qualified Automotive grade
Part of the AutoDevKit™ initiative
Applications: automotive bipolar stepper motor

Design Files

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It is your responsibility to test the circuit yourself and determine its suitability for you. EEWorld will not be liable for direct, indirect, special, incidental, consequential or punitive damages arising from any cause or anything connected to any reference design used.

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Update:2025-05-09 16:19:49

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