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VBAT circuit for STM32F429

Question asked by Greg on May 21, 2015
Latest reply on May 23, 2015 by Majerle.Tilen
We are using the STM32F429ZIT6 and we need to keep the RTC running when VDD is not present.  Can we hook up a coin-cell battery directly to VBAT, with no switching/monitoring circuit?  Any help would be MUCH appreciated!!