MCP79411 datasheet(32/38 Pages) MICROCHIP

Part #	MCP79411

Description	I2C??Real-Time Clock/Calendar with EEPROM, SRAM, Unique ID and Battery Switchover

PDF	38 Pages

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Manufacturer	MICROCHIP [Microchip Technology]

Direct Link	http://www.microchip.com

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32 / 38 page

MCP7941X

DS22266B-page 32

Preliminary

 2011 Microchip Technology Inc.

APPENDIX A:

REVISION HISTORY

Revision A (10/2010)

Original release of this document.

Revision B (03/2011)

Minor typographical edits;

Added Appendix B: Device Errata

APPENDIX B:

DEVICE ERRATA

Devices with silicon revision prior to A4 (date code prior

to 11/10) have an errata where the AM/PM bit (Bit 5 in

This is coincident with the OSCON bit getting cleared.

This can occur due to the following conditions:

• The oscillator is stopped on the application.

• The oscillator is stopped by clearing the ST bit (Bit

7 in register 00h).

• The external CMOS source is stopped in

EXTOSC mode.

The work-around is to determine when the OSCON bit

is cleared and check in software for AM/PM bit corrup-

tion.

Devices with silicon revision A4 or later (date code after

11/09) do not have this issue.

MCP79411 Datasheet(PDF) 32 Page - Microchip Technology