Which regulator controls MMC3 IO voltage?

Forums Devices OSD335x-SM Which regulator controls MMC3 IO voltage?

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    • #14914
      Doug SpringerDoug Springer
      Participant

        We have a 3.3V SDIO card attached to the MMC3 interface:

        But our signals are still driving to 5V. How do we change the VIO voltage on these pins?

        Thanks

         

      • #14916
        Doug SpringerDoug Springer
        Participant

          It appears that not all signals are driving to 5V, only the clock is showing a 5.3V p-p voltage.

        • #14927
          Eshtaartha BasuEshtaartha Basu
          Moderator

            Doug Springer,

            We need some more information on your use case to help you better.

            1. Are you using an official OSD335x-SM board or a custom version of it?
            1.a If this is a custom board, are all the VDDSHVx pins tied to 3.3V?
            1.b Do you have any pull ups on MMC3 pins?

            2. It’ll be very helpful if you can share your full device tree files and at least the MMC3 interface, VDDSHV connections part of Schematics.

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