In x-NUCLEO-IDW01M1 -WHY level shifter(3.3v to 2.5v ) is used in the board?
RTS and CTS are tolerent to 5v but it is shifted to 2.5v,why?
Being tolerant and having undesirable current flows are two different things. The boards targets low power / low voltage applications. A significant number of pins aren't tolerant, and a robust design will likely need you to work in the 2.5V domain.
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