Datasheet

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 2014-2015 Microchip Technology Inc. DS80000611B-page 1

MCP7940N

The MCP7940N family devices that you have received

conform functionally to the current Device Data Sheet

(DS20005010F), except for the anomalies described in

this document.

The silicon issues discussed in the following pages are

for devices listed in Table 1. The silicon issues are

summarized in Table 2 .

The errata described in this document will be addressed

in future revisions of the MCP7940N silicon.

Note: This document summarizes all silicon

errata issues from all revisions of silicon,

previous as well as current. Only the

issues indicated in the last column of

Table 2 apply to the current silicon

revision.

Note: For more information on identifying the

product date code, refer to Packaging

Information section of the product Data

Sheet or contact your local Microchip

sales office.

TABLE 1: AFFECTED PART NUMBERS

Part Number

MCP7940N

TABLE 2: SILICON ISSUE SUMMARY

Issue Number Issue Summary

Affected Date Codes

(1,

All

1 Date incrementing at noon. X

2 Spurious alarm interrupts when matching on minutes. X

Note 1: Only those issues indicated in the last column apply to the current silicon revision.

2: The date codes are presented in YYWW format.

MCP7940N Family Silicon Errata

Summary of content (6 pages)

PAGE 1
MCP7940N MCP7940N Family Silicon Errata The MCP7940N family devices that you have received conform functionally to the current Device Data Sheet (DS20005010F), except for the anomalies described in this document. TABLE 1: AFFECTED PART NUMBERS Part Number MCP7940N The silicon issues discussed in the following pages are for devices listed in Table 1. The silicon issues are summarized in Table 2. The errata described in this document will be addressed in future revisions of the MCP7940N silicon.
PAGE 2
MCP7940N Silicon Errata Issues Note: This document summarizes all silicon errata issues from all revisions of silicon, previous as well as current. Only the issues indicated by the shaded column in the following tables apply to the current silicon revision. 1. Issue: Date Increment When operating in 12-hour mode (RTCHOUR<6> is set) if the application loads an hour value before 12:00 PM while the oscillator is running then the date and day of week may increment at 12:00 PM.
PAGE 3
MCP7940N APPENDIX A: DOCUMENT REVISION HISTORY Rev A Document (04/2014) Initial release of this document. Rev B Document (12/2015) Added Silicon Issue 2 (spurious alarm interrupts when matching on minutes).  2014-2015 Microchip Technology Inc.
PAGE 4
MCP7940N NOTES: DS80000611B-page 4  2014-2015 Microchip Technology Inc.
PAGE 5
MCP7940N 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.
PAGE 6
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