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MSP430 Ultra-Low Power 16-bit Microcontroller Forum
MSP430F5437A during power loss Vcore is 0.4V above VDD
CVcore = 0.47uF, VDD = 3.0V, Tambient = -40C
Vcore is 0.4V above VDD during power loss as VDD and Vcore decay for 1 second as VDD decays from 0.7V to 0.2V. It appears that Vcore clamping diodes are powering VDD during the power loss. Is this a concern?
I'm not sure whether Vcore actually has clamping diodes. Vcore is the exposed output of the internal core voltage regulator. Except of teh 0.47µF capacitor, nothing is allowed to connect to it.And the voltage regulator itself is hopefully designed to stand an input power loss while there is output charge.However, I think the observed decay on both VCC and Vcore is because the core continues to draw from Vcore, draining it, while VCC itself must have at least 4,7µF capacitance that is drained by the peripherals. And not a flush back from Vcore to VCC.
But of course I may be wrong. TI has not disclosed the internal schematics. so I can only hope that it is safe to remove power from the MSP :)
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