Evaluation board for L9942XP microstepping fully integrated motor driver

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.

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 ÷ 20 V.
  • 2 LEDs for monitoring VBatt and 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





Description Version Size
DB2143 DB2143: EVAL-L9942 2.0 319 KB
Description Version Size
UM1707 UM1707: EVAL-L9942 3.0 2 MB
UM1947 UM1947: EVAL-L9942 Graphical User Interface 2.0 5 MB


Board Manufacturing Specifications
Description Version Size
EVAL-L9942_pcb layout 1 MB
Bill of Materials
Description Version Size
EVAL-L9942 BOM 1.0 43 KB
Schematic Pack
Description Version Size
EVAL-L9942 schematic 3.0 245 KB


Description Version Size
Evaluation products license agreement 1.4 128 KB


Evaluation Tool Software


型号 Marketing Status Unit Price (US$) * Quantity ECCN (EU) ECCN (US) Country of Origin More info Order from ST Order from Distributors
EVAL-L9942 Active 58.8 1 NEC EAR99 - MORE INFO No availability reported, please contact our Sales office

(*) 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


型号 Marketing Status RoHS Compliance Grade Material Declaration**
EVAL-L9942 ActiveNot compliant

(**) The Material Declaration forms available on st.com 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.