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BQ77915: Stacked configuration question

Part Number: BQ77915

Hello TI team!

I have a simple question I'd just like to have clarity on when it comes to ICs in stacked configuration, I'm using two BQ77915 ICs with three cells each attached to them. On the datasheet it says to connect the CCFG pins directly to the VSS, does it mean that both devices are to be connected to the lower devices GND or should the upper device's CCFG pin be connected to the lower side of cell 3.

Kind regards,

Patryk.