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The datasheet for the STM32F405xx mentions "Up to 138 5 V-tolerant I/Os". Unfortunately I can't find any more information on them. Are the GPIO pins (specifically IO_2/PB5) tolerant to 5V input?

Edit: According to page 57, the pin is listed as "FT" which should translate to 5V tolerant, right?

Hi,

This is something we have never used but yes, pins marked FT are 5V tolerant. Also the PULL-UP/PULL-DOWN must be disabled for the pins to be used with 5V input (page 114, note 5).