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PCA9306: Query on Pull up resistors on I2C lines

Veeralakshmi Sankar
Prodigy 20 points
Part Number: PCA9306

Hello Support,

Greetings!!!

We are using I2C level shifter PCA9306 for our design.

We followed the datasheet reference design.

CPU <3.3v term> -----3.3v bus-------+---------------+-----------<3.3v termination>---last 3.3V device

                                                              |                     |

                                                     Level shifter       3.3V device

                                                     1.8V device

Here, we have 3.3V as master and also have 3.3V devices and one 1.8V device connected via level shifter. 

In that case do we need to add pull up resistors on 1.8V I2C lines?

We already have pull up resistors on 3.3V I2C lines. Is that enough?

Please provide your suggestions.

Thanks & Regards,

Veeralakshmi