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Can TS3USB221 switch I2C Signals? How do you implement I2C pull up resistors using a passive FET switch like TS3USB221
Yes, TS3AUSB221 does not have internal pull ups. When implementing I2C communication with this device, there needs to be pull-up resistors on both the master and slave buses to prevent glitching when switching channels.
This post below shows some other signal switches being used in I2C applications e2e.ti.com/.../390098
In our board, channel switching is not done during operation. It is controlled by a switch, and the channel will be selected prior to power on.
Pullups are provided on the 1D and 2D side, but not on the D signals. The artwork is almost finished. Is it mandatory to provide pull up on both sides, since there is no channel switching during operation?
I want to add that if you use the switches for I2C signaling and have pull-ups on both sides you need to halve the pull-up strength(double the pull-up resistance) since whichever side is driving the bus now has to drive two sets of pull-up resistors.
