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PF8200 pull up resistor strength

Question asked by adevries on Feb 11, 2020
Latest reply on Feb 12, 2020 by G.w. Sun

Hello,

 

I'm using the PF8200 in a design, and I had some questions about the pull-up resistors recommended by the PF8200 datasheet. For signal pins INTB and PGOOD, the datasheet recommends pulling the signals high with a 100k resistor, and for signal FSOB, the datasheet recommends pulling the signal high with a 470k resistor. How were these recommended resistance values originally determined? Why is the FSOB pull-up resistor value different than the INTB and PGOOD pull-up resistor value? For my application, I initially followed the suggestion of the datasheet and used 100k resistors and a 470k resistor, but it now appears that the input pins sensing these signals have large leakage currents, so I may need a stronger pull-up resistor on these lines. Would it be acceptable to pull these lines high with 10k resistors? What about 1k resistors?

 

Thanks

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