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Evaluation board for L9942XP microstepping fully integrated motor driver
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The EVAL-L9942 is the Evaluation Board designed to provide the user a platform to evaluate the device L9942.

The L9942 is a motor driver for bipolar stepper motors with micro-stepping and programmable current profile look-up-table to allow a flexible adaptation of the motor characteristics and intended operating conditions.

Different current profiles can be chosen depending on target criteria: audible noise, vibrations, rotation speed or torque.

The decay mode used in PWM-current control circuit can be programmed to have slow, fast, mixed and auto-decay.

The programmable stall detection is useful to avoid running the motor too long time in stall position minimizing the noise.

The EVAL-L9942 board provides all the inputs and outputs capabilities necessary to drive correctly a bipolar stepper motor and also to monitoring diagnostic functionalities.

The board can be connected to the discovery boards developed for the SPC56 microcontroller.

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Data Brief

Key Features

  • Input signal connector compatible with the SPC56 Discovery boards. Possibility to connect the board to further microcontroller discovery or control boards by a simple adaptor.
  • Two output terminal blocks.
  • Wide supply voltage range (VBatt): 7 V รท 20 V.
  • 2 LEDs for monitoring VBattand EN signal.
  • Device controlled and programmed via SPI.
  • L9942 diagnostic functions via SPI.
  • Test points to monitoring both input signals (SPI, PWM, EN, StepClock) and the four outputs (out power stage).
  • No heat-sink is required


Design Resources


Technical Documentation

Product Specifications

Description Version Size
DB2143: EVAL-L9942
2.0 319 KB

User Manual

Description Version Size
UM1707: EVAL-L9942
2.0 651 KB
UM1947: EVAL-L9942 Graphical User Interface
1.0 5,970 KB

Hardware Resources

Board Manufacturing Specification

Description Version Size
EVAL-L9942_pcb layout
1,151 KB

Bill of Materials

Description Version Size
1.0 43 KB

Schematic Pack

Description Version Size
EVAL-L9942 schematic
2.0 218 KB

Related Tools and Software

Related Tools and Software

Part Number Description
STSW-L9942 EVAL-L9942 Graphical User Interface

Sample & Buy

Part Number Marketing StatusMaterial DeclarationOrder From STUnit Price (US$)*
@ 1
Distributor AvailabilityRoHS Compliance Grade
EVAL-L9942ActiveBuy Direct42.87Distributor reported inventory date: 2016-02-06
Distributor NameRegionStockMin. order
Not compliant-

(*) Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office or our Distributors
(**) The Material Declaration forms available on may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.
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