TI AM335X

AM335x General-Purpose EVM
(Revision 1.1)
Errata
Literature Number: SPRUHD7
January 2012
2
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SPRUHD7 – January 2012
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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no longer applicable or if the information has been documented elsewhere, those advisories are removed.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
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AM335x General-Purpose EVM (Revision 1.1)
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Revision 1.1 Known Design Exceptions to Functional Specifications
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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)
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