TCA9543A: does it have repeater feature

This device is a passive switch and does not buffer the I²C signals.

Hello,

Clemens is correct. This device is a passive switch and does not buffer I2C signals (no repeating feature). 

Cb = total bus capacitance spec'ed in the I2C standard. For standard mode or fast mode, the maximum parasitic bus capacitance that can be present on the bus is 400pF. 

TCA9543A is not a true buffer, but it can separate bus capacitances by turning off channels of the device. However, as Clemens has already mentioned, every active channel of the TCA9543A connects to the I2C bus, and therefore contributes additional parasitic bus capacitance in parallel.

Regards,

Tyler

Hi Kai,

You are correct here! 

Total cap would be = Host side cap + TCA9543A second side cap + any cap connected to the second side of TCA9543A (this includes trace cap + input capacitance for each slave device connected) 

You can estimate cap as the following:

3 pF / inch of trace

~10pF input cap for each connected slave device unless otherwise specified in the datasheet. 

Regards,

Tyler

Hi Tyler,

Thanks a lot for your support here!

Kai