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Thread: SD Card Guidance

  1. #1

    SD Card Guidance

    Hello! Iím wanting to add an SD card slot into a PCB that Iím designing and Iím a little bit confused about what is required. Just for clarification, if Iím already operating on 3.3V I donít need a level shifter right? Iíve also seen some people use EMI filter chips like these:

    Are they necessary? Or can I just hook up the SPI connections directly to my microcontroller? Thanks!

  2. #2
    Senior Member brtaylor's Avatar
    Join Date
    Mar 2016
    Portland, OR
    With everything on 3.3V, I've just wired from the SD to the microcontroller. Make sure you have enough current capacity for the SD - they can be a bit power hungry.

  3. #3
    Quote Originally Posted by nolansneeder View Post
    Are they necessary?
    It depends on the environment. If you are putting SD cards into the socket only at a nice safe ESD protected workbench, then no. If you are going to let any idiot do it anywhere, then yes, you need the ESD protection.

  4. #4
    That makes sense. Iím putting it on a data logger for a model rocket but I think it should be fine to get wired straight up at least for prototyping!

  5. #5
    I used a Teensy to build a rocket data logger.

  6. #6
    Thatís sweet! Iíll have to give it a read! Iíve built a couple through hole prototypes of mine but Iím interested in learning PCB design so Iím going to give that a shot for my next revision!

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