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    Changing I2C pullups to 5V, is it ok for the Duex?

    Duet Hardware and wiring
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    • jmlundefined
      jml
      last edited by

      Would it be ok to remove the I2C pullup resistors on the Duex and pull them up to 5V? I know there is one chip on the Duex that uses the I2C channels, but I don't know if it can handle I2C at 5V. Does anybody know?

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      • fmaundefined
        fma
        last edited by

        If you are talking about the I²C I/O chip SX1509B, no, I²C lines can't exceed 3.7V (as main voltage). See http://www.mouser.com/pdfdocs/sx150x_89b.pdf, bottom of page 8.

        Frédéric

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        • jmlundefined
          jml
          last edited by

          Perfect, thank you.

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