X-NUCLEO-IDW01M1 -WHY level shifter is used in the board

[chaitanya jasti]

Posted on February 28, 2017 at 16:50

Hi,

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?

[Tesla DeLorean]

Posted on February 28, 2017 at 19:35

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.