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LP8501 I2C timing

Dear all.

Our customer is saying that Rise/Fall timing of I2C of this device is difficult.
The minimum Fall timing is 15+0.1Cb ns.
Our customer's Falling timing is 3ns, it's difficult to control this timing.
Is this timing really necessary?

If this timing is necessary, are these capacitance of all totals which connect with this line?
(ex. input capacitance of device and delay capacitance)

And are these timing different from Fast mode(400KHz) and Slow mode(100KHz)?

Best Regards,
PAN-M

  • Hi PAN-M,

    The min spec for fall time in i2c is from the standard i2c spec. From what I understand, this limit is to minimize the ringing on the bus. If the customer does not see any severe ringing on the i2c bus, they can ignore this limit, 3 ns should be fine for operation

    There is no min spec for fall time In standard mode.

     Regards

    H L