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BQ24780S: For Smart Battery, is the BQ24780S a SMBUS Master or Slave?

Part Number: BQ24780S

As we know, in the communication between BQ24780S and EC, the BQ24780S works as a SMBUS Slave.

1, So is there any SMBUS communication between BQ24780S and smart battery?

2, Who is the SMBUS master between BQ24780S and smart battery if the answer to above question is yes?

3, What is the function or usage for the SMBUS communication between BQ24780S and smart battery if the answer to above question is yes?