LP5569: I2C rise/fall time measurment

user6519235

Part Number: LP5569

Hello,

I have a question about I2C rise /fall time measurement.
I searched past questions, the rise/fall time of I2C was 10% -90%.
Please see the waveform below.

It can be seen that the L voltage is 0.27 V, but since the VIL is max. 0.4 V, I think there is no problem.
In this case, since the Tr time cannot be measured from 0.18 V of 10%, is it correct to assume that it is a time from 0.27 V to 1.62 V of 90% as in this waveform?

Best Regards,

Hyodo

over 3 years ago

0 Monet Xu over 3 years ago

TI__Expert 8055 points

Hi Hyodo,

Rising time is used to defines how steep the clock is. Rising time is defined to be the time between 10% amplitude to 90% amplitude which is irrelevant with VIL_max.

Best Regard

Monet Xu

0 user6519235 over 3 years ago

Prodigy 190 points

Hi, Monet

Thank you for your reply.

I understand that the VIL and the rising time are irrelevant.
Then, in the case of this waveform, is the rising time the time from 0.27 V to 1.62 V as indicated by this cursor?

Best Regards,

Hyodo

0 Monet Xu over 3 years ago in reply to user6519235

TI__Expert 8055 points

Hi Hyodo,

The rising time is from 0.27+0.18 to 1.62V

Best Regard

Monet Xu

0 user6519235 over 3 years ago in reply to Monet Xu

Prodigy 190 points

Hi,Monet

Thank you!

Beat regards,
Hyodo

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LP5569: I2C rise/fall time measurment