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BQ3287EMT

Hi - We've been using this part for years.  Although we have had failures, it has not been that big of a problem.  We have a new supplier which is producing the boards that use this RTC, they are finding roughly 70% of the RTC modules are not oscillating.  In the past, when the supply is applied to the RTC, it comes out of sleep mode and starts to run immediately.  Has anyone had this type of trouble with this module?  The oscillation I'm referring to is the square wave output.  Thank you for your help.