EV2400 pullup manage for bq34z100

Hello, 

We developed a board with Bq34z100 we thought that the EV2400 used pull up for i2c but not our ev2400. When we saw shematics in the datasheet we understood  that the pullup must be managed but we don't know how. The board works with external pull up.

Thank you for your answer

Julien DREAN