this is information on a product in full production. for further information contact your local stmicroelectronics sales office. december 2013 docid025658 rev 1 1/5 EVAL-L9942 EVAL-L9942 data brief - production data 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 (v batt ): 7 v 20 v. ? 2 leds for monitoring v batt 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 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. table 1. device summary order code reference EVAL-L9942 EVAL-L9942 evaluation board www.st.com
contents EVAL-L9942 2/5 docid025658 rev 1 contents 1 system requirements, hw and sw resources . . . . . . . . . . . . . . . . . . . . 3 1.1 system requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
docid025658 rev 1 3/5 EVAL-L9942 system requirements, hw and sw resources 4 1 system requirements, hw and sw resources 1.1 system requirements ? power supply: 7 v 20 v; 3 a ? spc56 discovery board or microcontroller board able to offer spi signals, en, stepclock, pwm signals and +5 v (v cc )
revision history EVAL-L9942 4/5 docid025658 rev 1 2 revision history table 2. revision history date revision changes 17-dec-2013 1 initial release.
docid025658 rev 1 5/5 EVAL-L9942 5 please read carefully: information in this document is provided solely in connection with st products. stmicroelectronics nv and its subsidiaries (?st ?) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described he rein at any time, without notice. all st products are sold pursuant to st?s terms and conditions of sale. purchasers are solely responsible for the choice, selection and use of the st products and services described herein, and st as sumes no liability whatsoever relating to the choice, selection or use of the st products and services described herein. no license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. i f any part of this document refers to any third party products or services it shall not be deemed a license grant by st for the use of such third party products or services, or any intellectual property contained therein or considered as a warranty covering the use in any manner whatsoev er of such third party products or services or any intellectual property contained therein. unless otherwise set forth in st?s terms and conditions of sale st disclaims any express or implied warranty with respect to the use and/or sale of st products including without limitation implied warranties of merchantability, fitness for a particular purpose (and their equivalents under the laws of any jurisdiction), or infringement of any patent, copyright or other intellectual property right. st products are not designed or authorized for use in: (a) safety critical applications such as life supporting, active implanted devices or systems with product functional safety requirements; (b) aeronautic applications; (c) automotive applications or environments, and/or (d) aerospace applications or environments. where st products are not designed for such use, the purchaser shall use products at purchaser?s sole risk, even if st has been informed in writing of such usage, unless a product is expressly designated by st as being intended for ?automotive, automotive safety or medical? industry domains according to st product design specifications. products formally escc, qml or jan qualified are deemed suitable for use in aerospace by the corresponding governmental agency. resale of st products with provisions different from the statem ents and/or technical features set forth in this document shall immediately void any warranty granted by st for the st product or service described herein and shall not create or extend in any manner whatsoev er, any liability of st. st and the st logo are trademarks or register ed trademarks of st in various countries. information in this document supersedes and replaces all information previously supplied. the st logo is a registered trademark of stmicroelectronics. all other names are the property of their respective owners. ? 2013 stmicroelectronics - all rights reserved stmicroelectronics group of companies australia - belgium - brazil - canada - china - czech republic - finland - france - germany - hong kong - india - israel - ital y - japan - malaysia - malta - morocco - philippines - singapore - spain - swed en - switzerland - united kingdom - united states of america www.st.com
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