MCP795WXX MCP795WXX Family Silicon Errata The MCP795WXX family devices that you have received conform functionally to the current Device Data Sheet (DS22280C), except for the anomalies described in this document. TABLE 1: AFFECTED PART NUMBERS 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 MCP795WXX 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 2: SILICON ISSUE SUMMARY Part Number MCP795W10 MCP795W11 MCP795W12 MCP795W20 MCP795W21 MCP795W22 Affected Date Codes(1, 2) Issue Number Issue Summary All 1 Time running fast when VCC > 3.6V. X 2 Incorrect square wave clock output frequency when VCC > 3.6V. X 3 Incorrect EVLS debounce period when VCC > 3.6V. X 4 Incorrect WDT time-out period and pulse width when VCC > 3.6V. X 5 Incorrect alarm interrupt output pulse width when using the WDO pin and VCC > 3.6V. X 6 Date incrementing at noon. X Month write resetting date to 1. X 7 Note 1: 2: Only those issues indicated in the last column apply to the current silicon revision. The date codes are presented in YYWW format. 2012-2015 Microchip Technology Inc. DS80000542B-page 1 MCP795WXX 4. Issue: 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. Incorrect WDT Timings When VCC is greater than 3.6V, the Watchdog Timer time-out period and output pulse width will not match the data sheet-specified values. Work around Operate the device at or below 3.6V. Affected Silicon Revisions 1. Issue: Time Running Fast When VCC is greater than 3.6V, the internal time keeping registers do not count correctly, resulting in fast operation. All X 5. Issue: Work around Operate the device at or below 3.6V. Affected Silicon Revisions All X 2. Issue: Incorrect Clock Output Frequency When Vcc is greater than 3.6V, selecting a square wave frequency for the CLKOUT pin other than 32.768 kHz will result in the incorrect frequency being outputted. Work around Operate the device at or below 3.6V or select 32.768 kHz output. Affected Silicon Revisions All X 3. Issue: Incorrect EVLS Debounce Timing Incorrect Alarm Output Pulse Width When VCC is greater than 3.6V, if the WDO pin is selected as the alarm interrupt output pin, the output pulse width will not match the data sheetspecified value. Work around Operate the device at or below 3.6V. Affected Silicon Revisions All X 6. 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. When this occurs, the month and year will also increment according to the normal rollover rules. The date will increment again at 12:00 AM. Work around When VCC is greater than 3.6V, the low-speed event detect debounce period will not match the data sheet-specified values. Disable the oscillator by ensuring both the ST and EXTOSC bits are cleared and wait for the OSCON bit to clear before loading the new hour value. Work around Affected Silicon Revisions Operate the device at or below 3.6V. Affected Silicon Revisions All X All X DS80000542B-page 2 2012-2015 Microchip Technology Inc. MCP795WXX 7. Issue: Date Reset after Month Write If the application writes a new month value to the timekeeping registers, some combinations of date and month values may result in the date being reset to 1, even if the date is also written with the month. Work around When writing the month, always write the date first, using a separate Write command, even if the date value is not being changed. Avoid writing date and month values within the same Write command. Instead, terminate the Write command after loading the date and begin a new command to write the month. In addition, disable the oscillator before loading the new values. This is done by ensuring both the ST and EXTOSC bits are cleared and waiting for the OSCON bit to clear before loading the new values. Affected Silicon Revisions All X 2012-2015 Microchip Technology Inc. DS80000542B-page 3 MCP795WXX APPENDIX A: DOCUMENT REVISION HISTORY Rev A Document (03/2012) Initial release of this document. Rev B Document (12/2015) Adopted new document format. Added silicon issues 6 (date incrementing at noon) and 7 (month write resetting date to 1). Removed MCP795BXX part numbers. DS80000542B-page 4 2012-2015 Microchip Technology Inc. MCP795WXX 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. • Microchip is willing to work with the customer who is concerned about the integrity of their code. • Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code. Code protection does not mean that we are guaranteeing the product as “unbreakable.” Code protection is constantly evolving. We at Microchip are committed to continuously improving the code protection features of our products. Attempts to break Microchip’s code protection feature may be a violation of the Digital Millennium Copyright Act. If such acts allow unauthorized access to your software or other copyrighted work, you may have a right to sue for relief under that Act. Information contained in this publication regarding device applications and the like is provided only for your convenience and may be superseded by updates. It is your responsibility to ensure that your application meets with your specifications. MICROCHIP MAKES NO REPRESENTATIONS OR WARRANTIES OF ANY KIND WHETHER EXPRESS OR IMPLIED, WRITTEN OR ORAL, STATUTORY OR OTHERWISE, RELATED TO THE INFORMATION, INCLUDING BUT NOT LIMITED TO ITS CONDITION, QUALITY, PERFORMANCE, MERCHANTABILITY OR FITNESS FOR PURPOSE. Microchip disclaims all liability arising from this information and its use. Use of Microchip devices in life support and/or safety applications is entirely at the buyer’s risk, and the buyer agrees to defend, indemnify and hold harmless Microchip from any and all damages, claims, suits, or expenses resulting from such use. No licenses are conveyed, implicitly or otherwise, under any Microchip intellectual property rights unless otherwise stated. Trademarks The Microchip name and logo, the Microchip logo, dsPIC, FlashFlex, flexPWR, JukeBlox, KEELOQ, KEELOQ logo, Kleer, LANCheck, MediaLB, MOST, MOST logo, MPLAB, OptoLyzer, PIC, PICSTART, PIC32 logo, RightTouch, SpyNIC, SST, SST Logo, SuperFlash and UNI/O are registered trademarks of Microchip Technology Incorporated in the U.S.A. and other countries. The Embedded Control Solutions Company and mTouch are registered trademarks of Microchip Technology Incorporated in the U.S.A. Analog-for-the-Digital Age, BodyCom, chipKIT, chipKIT logo, CodeGuard, dsPICDEM, dsPICDEM.net, ECAN, In-Circuit Serial Programming, ICSP, Inter-Chip Connectivity, KleerNet, KleerNet logo, MiWi, motorBench, MPASM, MPF, MPLAB Certified logo, MPLIB, MPLINK, MultiTRAK, NetDetach, Omniscient Code Generation, PICDEM, PICDEM.net, PICkit, PICtail, RightTouch logo, REAL ICE, SQI, Serial Quad I/O, Total Endurance, TSHARC, USBCheck, VariSense, ViewSpan, WiperLock, Wireless DNA, and ZENA are trademarks of Microchip Technology Incorporated in the U.S.A. and other countries. SQTP is a service mark of Microchip Technology Incorporated in the U.S.A. Silicon Storage Technology is a registered trademark of Microchip Technology Inc. in other countries. GestIC is a registered trademark of Microchip Technology Germany II GmbH & Co. KG, a subsidiary of Microchip Technology Inc., in other countries. All other trademarks mentioned herein are property of their respective companies. © 2012-2015, Microchip Technology Incorporated, Printed in the U.S.A., All Rights Reserved. ISBN: 978-1-5224-0090-5 QUALITY MANAGEMENT SYSTEM CERTIFIED BY DNV == ISO/TS 16949 == 2012-2015 Microchip Technology Inc. Microchip received ISO/TS-16949:2009 certification for its worldwide headquarters, design and wafer fabrication facilities in Chandler and Tempe, Arizona; Gresham, Oregon and design centers in California and India. The Company’s quality system processes and procedures are for its PIC® MCUs and dsPIC® DSCs, KEELOQ® code hopping devices, Serial EEPROMs, microperipherals, nonvolatile memory and analog products. In addition, Microchip’s quality system for the design and manufacture of development systems is ISO 9001:2000 certified. DS80000542B-page 5 Worldwide Sales and Service AMERICAS ASIA/PACIFIC ASIA/PACIFIC EUROPE Corporate Office 2355 West Chandler Blvd. Chandler, AZ 85224-6199 Tel: 480-792-7200 Fax: 480-792-7277 Technical Support: http://www.microchip.com/ support Web Address: www.microchip.com Asia Pacific Office Suites 3707-14, 37th Floor Tower 6, The Gateway Harbour City, Kowloon China - Xiamen Tel: 86-592-2388138 Fax: 86-592-2388130 Austria - Wels Tel: 43-7242-2244-39 Fax: 43-7242-2244-393 China - Zhuhai Tel: 86-756-3210040 Fax: 86-756-3210049 Denmark - Copenhagen Tel: 45-4450-2828 Fax: 45-4485-2829 India - Bangalore Tel: 91-80-3090-4444 Fax: 91-80-3090-4123 France - Paris Tel: 33-1-69-53-63-20 Fax: 33-1-69-30-90-79 India - New Delhi Tel: 91-11-4160-8631 Fax: 91-11-4160-8632 Germany - Dusseldorf Tel: 49-2129-3766400 Atlanta Duluth, GA Tel: 678-957-9614 Fax: 678-957-1455 Hong Kong Tel: 852-2943-5100 Fax: 852-2401-3431 Australia - Sydney Tel: 61-2-9868-6733 Fax: 61-2-9868-6755 China - Beijing Tel: 86-10-8569-7000 Fax: 86-10-8528-2104 Austin, TX Tel: 512-257-3370 China - Chengdu Tel: 86-28-8665-5511 Fax: 86-28-8665-7889 Boston Westborough, MA Tel: 774-760-0087 Fax: 774-760-0088 China - Chongqing Tel: 86-23-8980-9588 Fax: 86-23-8980-9500 Chicago Itasca, IL Tel: 630-285-0071 Fax: 630-285-0075 Cleveland Independence, OH Tel: 216-447-0464 Fax: 216-447-0643 Dallas Addison, TX Tel: 972-818-7423 Fax: 972-818-2924 Detroit Novi, MI Tel: 248-848-4000 Houston, TX Tel: 281-894-5983 Indianapolis Noblesville, IN Tel: 317-773-8323 Fax: 317-773-5453 Los Angeles Mission Viejo, CA Tel: 949-462-9523 Fax: 949-462-9608 New York, NY Tel: 631-435-6000 San Jose, CA Tel: 408-735-9110 Canada - Toronto Tel: 905-673-0699 Fax: 905-673-6509 China - Dongguan Tel: 86-769-8702-9880 China - Hangzhou Tel: 86-571-8792-8115 Fax: 86-571-8792-8116 Germany - Karlsruhe Tel: 49-721-625370 India - Pune Tel: 91-20-3019-1500 Germany - Munich Tel: 49-89-627-144-0 Fax: 49-89-627-144-44 Japan - Osaka Tel: 81-6-6152-7160 Fax: 81-6-6152-9310 Italy - Milan Tel: 39-0331-742611 Fax: 39-0331-466781 Japan - Tokyo Tel: 81-3-6880- 3770 Fax: 81-3-6880-3771 Italy - Venice Tel: 39-049-7625286 Korea - Daegu Tel: 82-53-744-4301 Fax: 82-53-744-4302 Netherlands - Drunen Tel: 31-416-690399 Fax: 31-416-690340 China - Hong Kong SAR Tel: 852-2943-5100 Fax: 852-2401-3431 Korea - Seoul Tel: 82-2-554-7200 Fax: 82-2-558-5932 or 82-2-558-5934 China - Nanjing Tel: 86-25-8473-2460 Fax: 86-25-8473-2470 Malaysia - Kuala Lumpur Tel: 60-3-6201-9857 Fax: 60-3-6201-9859 China - Qingdao Tel: 86-532-8502-7355 Fax: 86-532-8502-7205 Malaysia - Penang Tel: 60-4-227-8870 Fax: 60-4-227-4068 China - Shanghai Tel: 86-21-5407-5533 Fax: 86-21-5407-5066 Philippines - Manila Tel: 63-2-634-9065 Fax: 63-2-634-9069 China - Shenyang Tel: 86-24-2334-2829 Fax: 86-24-2334-2393 Singapore Tel: 65-6334-8870 Fax: 65-6334-8850 China - Shenzhen Tel: 86-755-8864-2200 Fax: 86-755-8203-1760 Taiwan - Hsin Chu Tel: 886-3-5778-366 Fax: 886-3-5770-955 China - Wuhan Tel: 86-27-5980-5300 Fax: 86-27-5980-5118 Taiwan - Kaohsiung Tel: 886-7-213-7828 China - Xian Tel: 86-29-8833-7252 Fax: 86-29-8833-7256 Poland - Warsaw Tel: 48-22-3325737 Spain - Madrid Tel: 34-91-708-08-90 Fax: 34-91-708-08-91 Sweden - Stockholm Tel: 46-8-5090-4654 UK - Wokingham Tel: 44-118-921-5800 Fax: 44-118-921-5820 Taiwan - Taipei Tel: 886-2-2508-8600 Fax: 886-2-2508-0102 Thailand - Bangkok Tel: 66-2-694-1351 Fax: 66-2-694-1350 07/14/15 DS80000542B-page 6 2012-2015 Microchip Technology Inc.