| 04/08/04 - Dallas Semiconductor has trouble with chip die
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AN247
DS18x20 EEPROM Corruption Issue on B7 die
Dallas semiconductor is now requiring a wavier as of April 8th 2004 to get some parts. (Though it effects parts made earilier). It appears there is a problem in the B7 die used in several popular temperature chips. (DS18B20, DS1820S, and DS1822 ). Due to efforts at Dallas there are now software work arounds for helping to solve this problem. The time for a hardware fix is unknown at this time. One wonders how long this die has been in use, so check your sensors and developers may wish to implement the software work arounds to their software.evelopers Read the full application note about this issue
At the request of Dallas Semiconductor, we have removed the document AN247.pdf. titled "DS18x20 EEPROM Corruption Issue". Dallas has decided this should have been a "internal confidental document" and would rather not have it available on the web. The document explains the issue and documents workarounds. If you have further questions or need to locate this document, you can contact Dallas at thermal.support@dalsemi.com to ask for it. It is also available from their distributors.
See the Wavier (43,260 tif file): DS1820 wavier.tif
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