TCA9517: About TCA9517 Vlo-Vilc

user4969681 said:

①We want to know follwing specs

・Vol-Vilc　max

・Vilc　min

ViLc is a spec that we guarantee by design. I've looked through characterization data and found only about 5mV of variance on this spec across temperature and voltage.

Since ViLc is pretty consistent at 0.4V, you can just use VoL spec'd in the datasheet as the max to calculate the max value. Vol max is 0.6V therefore the larger value is about 0.2V

user4969681 said:

②Relationships between Vilc, Vol-Vilc and Vol

VoLB is the static offset of the device on B side when A side is driving.

ViLc is the voltage at which we say the input voltage on B side must be to drive a low from B to A when in contention (when A is driving the line). Note: the external driver on B side must drive the line below ViLc even where there isn't contention to ensure B side can maintain a low from B to A. 

VoL-ViLc is just the margin between the output and the input (meaning B side should not lock itself low or temporarily drive A side low if the VoLB is larger than the ViLc, the system designer should be sure noise does not ever drive VoLB below ViLc)

user4969681 said:

③TCA9517 have any restrictions on the connection between the master and slave devices with the A/B

The device does not know or care if there are I2C controller devices or I2C target devices on either side. The only restriction for the device is on B side in which we would not want to connect other static voltage offset devices on the B side. I would also not recommend placing devices with rise time accelerators on B side of TCA9517 either.

-Bobby