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Vbat problem on a STM32F4

Question asked by PAM on Jun 6, 2012
Latest reply on Nov 13, 2012 by John F.
I'm working on a custom design with in a STM32F4xx. A 420mF capacitor is connected to Vbat. ( with a serial diode and a resistor between Valim and Vbat to charge up the supercapacitor ).

The system power off it still 600mV to Valim if the supercapacitor is connected, 0V if not.
So I'm a bit confused,...

Any ideas ?