MCP23008 Rev. A Errata Datasheet by Microchip Technology

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‘MICROCHIP Work around The issue was addressed and no longer aggears in silicon revision A2. See Appendix B: “Silicon Revlsion Hislory" lo delermine how lo idenlily Ihe silicon revisions. Dale Codes that per lo l sue:
© 2005 Microchip Technology Inc. DS80251A-page 1
MCP23008
The MCP23008 parts you have received conform
functionally to the Device Data Sheet (DS21919C),
except for the anomalies described below.
All of the issues listed here will be addressed in future
revisions of the MCP23008 silicon.
1. Module: I2C™ Module
In silicon revision A1 and prior: The I2C may
detect its slave address (OPCODE) at the wrong
time in a data transfer and acknowledge (ACK) its
perceived OPCODE.
During normal operations, the MCP23008 expects
the byte immediately following a Start bit to be an
OPCODE. When the device is not addressed, it
should remain silent and not interfere with the bus.
However, the device continues to monitor the bus
and checks for an address match every 8 bits and
acknowledges (ACKs) if a match is detected.
While the device checks for a match every 8 bits,
every data byte transfer on the bus is 9 bits long,
causing the device’s matching routine to get out of
phase with the bus. Therefore, the false ACK could
occur in the data field as well as the ack field.
Work around
The issue was addressed and no longer
appears in silicon revision A2. See Appendix
B: Silicon Revision History to determine how
to identify the silicon revisions.
As long as there are no other devices on the bus,
or the data on the bus is known (and does not
cause a false match), the issue will not appear.
A hardware work around may be used which
disables the clock input to the MCP23008 when it
is not addressed.
Date Codes that pertain to this issue:
Date code 0542 and earlier have the issue.
Date code 0543 and later do not have the
issue.
Clarifications/Corrections to the Data
Sheet:
In the MCP23008 Data Sheet (DS21919C), the follow-
ing clarifications and corrections should be noted.
None.
MCP23008 Rev. A Silicon Errata
Rev A Documenl 11/2005
MCP23008
DS80251A-page 2 © 2005 Microchip Technology Inc.
APPENDIX A: REVISION HISTORY
Rev A Document (11/2005)
Initial Release of this Document.
APPENDIX B: SILICON REVISION
HISTORY
The following table and package marking information
indicates how to determine the revision of the
MCP23008 device. The revision information can be
determined by the Year and Week Code of the
manufacturer printed on the device.
TABLE B-1: SILICON REVISION/DEVICE
MARKING
Silicon
Revision
YYWWNNN Comments
Start Date End Date
Rev A2 0543NNN In Production
Rev A1 0543NNN
Legend: “N” is any alphanumeric character.
QUALITY MANAGEMENT SYSTEM CERTIFIED BY DNV = ISO/TS 16949:2002 =
© 2005 Microchip Technology Inc. DS80251A-page 3
Information contained in this publication regarding device
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and may be superseded by updates. It is your responsibility to
ensure that your application meets with your specifications.
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Printed on recycled paper.
Note the following details of the code protection feature on Microchip devices:
Microchip products meet the specification contained in their particular Microchip Data Sheet.
Microchip believes that its family of products is one of the most secure families of its kind on the market today, when used in the
intended manner and under normal conditions.
There are dishonest and possibly illegal methods used to breach the code protection feature. All of these methods, to our
knowledge, require using the Microchip products in a manner outside the operating specifications contained in Microchip’s Data
Sheets. Most likely, the person doing so is engaged in theft of intellectual property.
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DS80251A-page 4 © 2005 Microchip Technology Inc.
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