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STM32F4DISCOVERY VBAT pin

Question asked by pdsilva on Mar 31, 2014
Latest reply on Apr 3, 2014 by pdsilva
Hi all,

I want to use RTC from STM32F4DISCOVERY and have a doubt about VBAT pin that is connected to VDD through R26 0Ohm, this are saying that I need to take off R26 to plug a vbat battery, but if I take off the R26 a
jerry-rig is needed to connect battery.
So I ask, is it true, that I need to take off R26 and make a jerry-rig to plug vbat battery.
or I can plug the vbat battery in VDD with a diode, because the cpu turn-off everything other peripherals, except VBAT domain , when VDD fall down below some value prefixed?

Best regards,

Paulo

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