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LM5069: Design for Hot swap two batteries

Part Number: LM5069
Other Parts Discussed in Thread: TCA9511A, TPS2597, TPS25981

Tool/software:

Dear Sir, 

As below block diagram, we need the hot swap function for two batteries with I2C interface. 

There is three questions:

1. Is I2C Buffer TCA9511A necessary?

2. Do I need to add  hot swap protection IC between Charging IC and battery?  

3.  Any problem with my block diagram for battery hot swap design? Do I need to add more design for completing the hot swap function?