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TPS65987D: TPS65987 I2C field

Part Number: TPS65987D

Hi Sir,

We read the 8.3.9.2 I2C page of TPS65987D, but sorry confusing the chapter still,. 

could we  connect (I2C-1) to DSP  and (I2C-2) / (I2C-3) to charger as like the portable speaker ?

or I2C-2 is claimed to thunderbolt only ?

Which GPIO (IRQ ? HPD ?)was necessary for portable application ? 

what`s the meaning of "EC" ?