Greetings,
I am working on a project involving RTC and TAMP mechanism of U5 series MCUs, specifically STM32U585. I have some questions about the working principle of the TAMP pins.
In the reference manual RM0456, it is written that the TAMP pins checks if the line is opened or it is shorted (Section 64.1: "Active tamper which increases the security level by auto checking that the tamper pins are not externally
opened or shorted.").
I was able to make the open circuit detection work but I couldn't make the shorting detection work, that might be my fault though. The shorting detection is available in U585 right?
Also I was wondering how precise is the shorting detection? Let's assume I have a 50 meters long transmission line, can it detect if the line is shorted about 50 centimeters (the line is now 45.5 meters)? If not, how much length of the tranmission line must be removed to make the TAMP pins detect it? In addition, should I do anything to make the shorting detection active or is enabling the active tamper detection enough?
Also, does the TAMP pins have any capability of capacitive or inductive measurement to add an extra layer of protection?
Thanks in advance.
