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Micro SD card implementation in OSD32MP15x_RED.sch

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    • December 8, 2020 at 3:42 pm #11005
      Gavin MasseyGavin M
      Participant

        Hello

        I am working on a new design and I am working off of the OSD32MP15x_RED board as a reference. I am trying to understand the implementation of the Micro SD Card. On sheet 5 there is a net ‘SDMMC1_CD’ connected to pin named ‘CD#’ on the DM3BT-DSF-PEJS Micro SD Card holder. I can not figure out what this signal is for. I looked at the footprint of the manufacturer and can not match the ‘CD#’ pin to any pads. Is this some sort of Card Detection functionality?

        Thanks for your help in advance

        Attachments:

        1. micro-sd-card.png

      • December 9, 2020 at 10:21 am #11011
        Erik Welsh
        Keymaster

          Gavin,

          If you look at Note 2 on page 1 of the DM3BT-DSF-PEJS Micro SD Card datasheet, you can see that there is a Card detection switch (B) that corresponds to this pad on the symbol.  On the footprint, the card detection pad is the slightly smaller rectangle in the upper right corner.  If you extract the library from the Eagle schematics, you can check the pad names and mapping for the device.

          Please let us know if you have any additional questions.

          Thanks,

          Erik

           

        • December 10, 2020 at 6:42 am #11015
          Gavin MasseyGavin M
          Participant

            Brilliant! Thanks for your help.

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