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stm32f3 using comparator with opamp.

Question asked by bong.jiwoo on Jul 3, 2013
Latest reply on Jul 3, 2013 by fm

I'm on stm32f3.

As far as I know, comparators on the device is very fast so it's very suitable to detect short circuit and over current condition in 50 ns. but most of shunt resistor has very LOW value. so it should be amplified to be used for comparator's input. 

on stm32f3 it has PGA. could I pre amplify by using PGA? but  dose a comparator with relatively slow opamp makes sense? .. 

or is there something that PROs do? 

Thank  you for reading. and answering in advance.