Dear all.
About I2C fall timing(ticf) in datasheet, the minimum timing is 20+01Cb.
It is very difficult to make this waveform.
When other answers are seen, when there is no ringing, maybe early falling timing is OK.
In PCA9544A, the ringing is satisfied under VIL level in 20+01Cb timing, is it OK?
Regards,
PAN-M
Hello PAN-M,
The I2C spec defines that there needs to be an internal filter that suppresses noise that is within a 50ns pulse width.
If you have noise that is larger that 0.3*Vdd and is wider than 50ns then you could potentially have a problem. If the noise is on the SCL line than the communication could be corrupted due to improper synchronization. If the noise is on the SDA line than a bit could be miss interpreted.
-Francis Houde
