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DM814x: how to control SDx_POW(MMC_POW) pin

Chris Meng
Mastermind 37786 points

Hi,

I found below statement in DM814x TRM, but I can't find the way to control SDx_POW(MMC_POW) pin. Would you pls kindly help?

MMC_POW Used for MMC/SD card's cards on/off power supply control. When high, denotes power-on condition.

  • 0
    Intellectual 270 points

    Hi,

     Control the DVDD_SD supply using load switch like MIC94060YC6.By default keep EN pin of load switch as low through pull down resistor since  SD1_POW is internally pulled up to DVDD on the processor.

    when we inserted the SD card the card detect(SD1_SDCD)signal will go low with the help of mechanical switch on the slot.Then Enable the load switch through SD1_POW by Monitoring  the status bit of card detect on the MMCHS_SYSTEST register.

    Regards,

    Nanthan.