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urgent! BQ78PL116EVM no ACK

Hwanheng
Prodigy 10 points
Other Parts Discussed in Thread: BQ78PL116

Hello,

Now I am using  ATmega88 to communicate with BQ78PL116EVM.  as sent  slave address + R/W to EVM, but can not get an ack.

but when I connect ATmega88 to BQ20Z95, the communication is correctly.

BQ20Z95 & BQ78PL116 are using SMBUS for communication.

is anyone can give me an solution?