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VDD_FT

Question asked by Trevor on Nov 7, 2011
I'm interested to know about the input protection doides on five volt tolerent IO. In various places the documentation shows the clasic diode from the IO to "VDD_FT" and states "VDD_FT is a potential specific to five-volt tolerant I/Os and different from VDD". So my question is what is VDD_FT? What is it connceted to? What does a diode connected to VDD_FT limit the input to i.e. what voltage is VDD_FT? If VDD_FT is 5V then how is it achieved when the supply voltage is always much less than 5V?

Regards
Trevor

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