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TCA9517-Q1: TCA9517-Q1completely powered off leakage current on data pins

Part Number: TCA9517-Q1
Other Parts Discussed in Thread: BQ24780S

TCA9517-Q1Hi,

In my application, I have a battery charger chip (BQ24780S) and a battery BMS (some BQ chip I don't know precisely) talking together on a shared SMBus, and a FPGA sending some requests from time to time. There is a condition where the FPGA is powered OFF while the battery and its charger are still communicating. I would like to use the TCA9517-Q1 to "isolate" the FPGA from the rest of the bus when powered OFF.

As I don't want the TCA9517-Q1 to sink current on the battery, I plan to power both A and B sides with the FPGA 3V3 network (i.e. both sides can be powered OFF at the same time). The A side would be connected to the charger/battery network while the B side would be connected to the FPGA. The pull-up resistors on the charger side would not be polarized by the A side power, but to a "permanent" 3V3 issued from the battery, because I need the charger to keep on working with its battery even when the FPGA 3V3 is down.

Can I do that ?

In such condition, if reliable, what leakage current would sink the SDAA and SCLA pins ?

Is there a better way to "unplug" my FPGA from the SMBus without consuming energy from the battery ?

Thank you by advance !

Cyril