Hi Sirs,
Sorry to bother you.
We have use TCA9406 on I2C signal for 1.8v to 3.3v.
However, since we are set to OE = 1, so only the function of the Internal PU can be used.
Now we try to make parallel external resistors and increase the capacitance of the ground to change IC's Rise/fall time
But found that can not meet I2C spec.
So we would like to check how to change the IC's Rise/fall time
Our schematic and attached file of the measured waveform as below,
Port A is 1.8V and Port B is 3.3V.
The capacitor is added at the end, such as the waveform name of 39p/220p.
Waveform purple signal is SDA, green is SCL
Schematic:
39P Cap waveform:
220P Cap waveform:
