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st32F I/O protection circuit

Question asked by robber on Aug 25, 2016
Latest reply on Aug 25, 2016 by Clive One
Hello everyone, i have a st32F407 and i was thinking if it is working on 3.3V and almost all its pins are 5V tolarant what kind of protection circuit it has for overvoltage and ESD. I saw on the reference manual in 8.3/figure 25 the structure of a five-volt tolerant I/O port bit, it has EXTERNAL clipping diodes at 5V.
So my question is do you have to put external protection circuit ? Is it already protected inside the pin?

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