L9638D Errata Sheet Potential RxD lock-up upon LIN wake-up during sleep mode transition 1 Silicon identification This document refers only to L9638D device. 2 Reference specification Limitations in this document are with reference to the L9638D datasheet rev 4 (October 2004). 3 Silicon limitations 3.1 Potential RxD lock-up upon LIN walk-up during sleep mode transition A lock-up of the RxD signal path can potentially happen, when a falling edge on the LIN bus occurs during the transition from NORMAL to SLEEP mode. The transition from NORMAL to SLEEP mode is initiated by the application with a falling edge on EN. With this event an internal timer is started to qualify a valid low level on EN. At the end of this filter period (tGTS, typically 40s) the sleep mode is entered and the INH output signal is switching to low level. This transition to SLEEP mode however does not occur when a walk-up event is detected before the timer expired (tGTS). The lock-up condition may occur: IF a falling edge on the LIN bus occurs WITHIN the critical window before INH goes low. The maximum duration of the critical window is 1s. To exit the lock-up state the power supply of the device must be switched off. The timing of the lock-up condition is shown in the diagram below. Figure 1. Timing of the lock-up condition tGTS = 40..100s The critical window starts 1s before INH goes down (signaling that L9638D is in SLEEP mode). A falling edge on the LIN bus during this window may lock-up the RxD signal in a tristate mode. EN INH LIN INH LIN Critical Window = 1s March 2006 Rev 1 1/4 www.st.com Workaround 4 L9638D - Errata Sheet Workaround ST recommends to do not use the SLEEP mode of the L9638D if a falling edge on the LIN can occur during the transition from NORMAL to SLEEP. A falling edge may be caused either by a frame, a wake-up signal or a perturbation on the LIN bus. 2/4 Revision history 5 L9638D - Errata Sheet Revision history Table 1. 3/4 Document revision history Date Revision 21-Mar-2006 1 Changes Initial release. L9638D - Errata Sheet 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 herein 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 assumes 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. If 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 whatsoever 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. UNLESS EXPRESSLY APPROVED IN WRITING BY AN AUTHORIZE REPRESENTATIVE OF ST, ST PRODUCTS ARE NOT DESIGNED, AUTHORIZED OR WARRANTED FOR USE IN MILITARY, AIR CRAFT, SPACE, LIFE SAVING, OR LIFE SUSTAINING APPLICATIONS, NOR IN PRODUCTS OR SYSTEMS, WHERE FAILURE OR MALFUNCTION MAY RESULT IN PERSONAL INJURY, DEATH, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE. Resale of ST products with provisions different from the statements 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 whatsoever, any liability of ST. ST and the ST logo are trademarks or registered 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. (c) 2006 STMicroelectronics - All rights reserved STMicroelectronics group of companies Australia - Belgium - Brazil - Canada - China - Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States of America www.st.com 4/4