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BQ40Z50: SMBus monitoring on multiple boards

Part Number: BQ40Z50
Other Parts Discussed in Thread: TCA9548A

Hi - 

Customer is looking for SMBus dongle to monitor multiple PCBs. Anything we can recommend here? Here is quick block diagram to help articulate:

Alternatively they could use three separate SMBus monitors to go to central MPU , in case that opens up an options. 

Originally, I sent these posts back to customer:

BQ40Z50-R2: Question for multiple BQ40Z50-R2 on same bus

BQ40Z50-R2: Question regarding multiple BQ40z50-R2 use case and sleep mode

But they advised this is not what they are looking for. 

Looking for your guidance on if this type of device exists? They are looking for off-the-shelf option.

Thanks, Tyler