AM335x General-Purpose EVM (Revision 1.1) Errata Literature Number: SPRUHD7 January 2012 2 Copyright © 2012, Texas Instruments Incorporated SPRUHD7 – January 2012 Submit Documentation Feedback Errata SPRUHD7 – January 2012 AM335x General-Purpose EVM (Revision 1.1) 1 Introduction This document describes the known exceptions to the functional specifications for the AM335x general-purpose EVM (GP EVM). For additional information, see the AM335x General-Purpose EVM User's Guide (literature number TBD). 2 Revision 1.1 Known Design Exceptions to Functional Specifications Table 1 lists known design exceptions to functional specifications for general-purpose EVM revision 1.1. Advisories are numbered in the order in which they were added to this document. If the design exceptions are still applicable, the advisories move up to the latest EVM revision section. If the design exceptions are no longer applicable or if the information has been documented elsewhere, those advisories are removed. Therefore, advisory numbering in this section may not be sequential. Table 1. Revision 1.1 Advisory List Title ...................................................................................................................................... Page Advisory 1.1.1 — Keypad Capacitor Filter Issue ..................................................................................... 4 Advisory 1.1.2 — PORz Reset Circuit ................................................................................................. 4 SPRUHD7 – January 2012 Submit Documentation Feedback AM335x General-Purpose EVM (Revision 1.1) Copyright © 2012, Texas Instruments Incorporated 3 Revision 1.1 Known Design Exceptions to Functional Specifications www.ti.com Advisory 1.1.1 Keypad Capacitor Filter Issue Revisions Affected: 1.1A Details: The keypad on the general-purpose daughterboard has three capacitors which are meant to filter key bounces. These capacitors may interfere with software builds that use alternate means to read the keypad switches and filter the mechanical bounce from the switches. Workaround: Remove C125-C127 from the general-purpose daughterboard. Advisory 1.1.2 PORz Reset Circuit Revisions Affected: 1.1A Details: The logic driving the PWRONRSTn input on the AM335x device is at 1.8-V level instead of the VDDSHV6 level (3.3 V). Since this input generates a reset when active, this lower level may drive the board into reset when not intended. Workaround: • • Remove U1. Add an SN74AUP1G08, an SN74AVC1T45, and an SN74AUP1G08 so that PWRONRSTn on the AM335x device is driven to the correct voltage level (see Figure 1). Figure 1. PORz Circuit 4 AM335x General-Purpose EVM (Revision 1.1) Copyright © 2012, Texas Instruments Incorporated SPRUHD7 – January 2012 Submit Documentation Feedback IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete. All products are sold subject to TI’s terms and conditions of sale supplied at the time of order acknowledgment. TI warrants performance of its hardware products to the specifications applicable at the time of sale in accordance with TI’s standard warranty. Testing and other quality control techniques are used to the extent TI deems necessary to support this warranty. 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