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Original question:

LSF0102-Q1: LSSF0102 Pull up resistor

LSF0102-Q1: LSF0102-Q1 sch review

Hangjie Wang
Intellectual 870 points
Part Number: LSF0102-Q1

Hi expert,

Could you pls help review below sch? thanks.

And why do we need to choose a pull-up resistor like this? If I choose to high, what will be the impact? thanks.

  • 0
    Guru 257880 points

    The datasheet shows what resistors are needed to get a specific pull-up current.

    But these current values are just some examples. Depending on the signal frequency and the board's capacitance (about which you have not told us), the required current might be much smaller.

  • 0
    TI__Expert 7730 points

    Hello Hangjie,

    It's hard to see with some text overlapping but as long as this pull-up is 200Ωk then it's fine.

    The resistor values determine how much current your driver will sink. The lower the value, the more current you will sink which allows higher signal frequencies to be used.

    Regards,

    Josh