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TXS0206 in SD 3.0 application

Eric Eckenrode
Intellectual 275 points

Hello,

SD 3.0 says that communication is initiated at 2.9V w/ SD cards.  If the inserted device supports SD 3.0, the voltage bus is then reduced to 1.8V.  I assume that I provide a supply at 2.9V on the card side and then I must switch this to 1.8V when needed.  Is there an app note or reccomnedations for a suggested solution?


Thanks,

Eric

  • 0
    TI__Genius 14317 points

    Hi Eric,

    I couldn't locate an App. Note for this but I do know that you have to switch the SD card side supply voltage to the TXS device to match the SD supply voltage per the SD 3.0 spec. (switch times, levels etc.).

    I'll ask the Translator Product Apps. folks for more.

  • 0 in reply to Jeffery Pfarr
    TI__Expert 4705 points

    Hi, Eric,

    Currently, we don't have any application note for it. Do you mean for both SD card VDD voltage and IO voltage need to switch?

    Actually for the SD3.0 card VDD range,  it doesn't need switch to 1.8V, I think inside card , it should have the internal LDO which can generate the 1.8V. it can be confirmed by checking the SD3.0 card spec.

    For IO side,I think yes. you need to switch to 1.8V voltage,but if the host support this switch by itself, you don't need to do special thing, just need to check the host spec for how to implment the Voltage Switch.

    Not sure this is what you want, if not , please let me know.

    BR
    junjie

     

  • 0 in reply to Junjie Mai
    Prodigy 10 points
    Hi junjie：

    For micro SD3.0 card,should I implent 1.8V/3.3V swith circuit?
    Is there 1.8V regulator inside SD3.0 Host and Micro SD3.0 card ?

    Please teach me.
    Thanks a lot.