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LMK03318: about LMK03318 PDN dealy

Vera Mao
Expert 5065 points
Part Number: LMK03318

hi dear supporting team,

for LMK03318 PDN, what's the delay requirement btw power up to pulling it up as below? if they use VDDO_01 of 1.8V, how big Cpdn should be? tks!

  • 0
    TI__Genius 16845 points

    There is no delay requirement on PDN. The PDN pin could be left floating for non-delayed startup.

    You could use Cpdn if you want to achieve a delay. In this case, first determine the delay time you need. The RC time constant will be R*Cpdn. The VIH of the PDN pin is 1.2V, you will need to calculate the time required for the PDN pin voltage to charge up to 1.2V from zero volts using the 1.8V internal VDDO_01 supply.

    Kind regards,
    Lane