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LP8758-E0: Startup

Eric Steimle
Expert 2290 points
Part Number: LP8758-E0

I just want to make sure I understand how this part functions at initial power up.   It looks like by default it comes up with the buck regulators enabled but with internal pull downs on the enable pins.  So really it will come up with all outputs off correct?  Then if I want to only control this over I2C I would first set my voltage levels over I2C.  Then to activate the outputs in this state I'd clear bit 6 in the BUCKx_CTR1 register.  That looks like it would say ignore the pins and since it was already enabled it would turn on.  Do I understand that correctly?

Thank you

  • 0
    TI__Genius 11020 points
    Hello Eric,

    Device starts up when NRST is set high. EN1 controls all the bucks, so when EN1 is set high the buck outputs are active.

    Yes, you can keep the EN1 pin low and enable the outputs by setting BUCKx_CTRL1 register bit 6 to 0 (keeping other bits as is).

    Thanks.

    Best regards,
    Tomi Koskela