A/D input signal saturated at 3.3V, despite "5 V tolerant I/O"

Dear all,

Dear all,

I use a NUCLEO_H7A3ZI_Q, connected through an external Arduino/Zio-type connector to an external signal generator, which outputs a constant voltage level.

• the input channel of the μCU appears to be saturated to 3.3V; it shows this value, even if I increase the incoming voltage to e.g. 4.0V.
• However, the manual DS13313 states, that this channel should be 5.0V tolerant (see attachment)

Could this be related to the caution notice from the UM2408 Manual (see attachment)

I wonder how the adapter board is able to saturate the value, if that is true...

Many thanks

L.A.