LTC4291-1/LTC4292 doesn't get the output power

Hi ,

My question seems LTC4291-1 doesn't work well.

So I check the LTC4291-1 whether it is fail or ok by I2C read back. 

I have tried to read the register by MCU I2C ,but it shows I2C not ack.(Please see the attached picture)

I have tried auto pin to high or low. but the result is same.

The gray waveform is I2C clock, The orange waveform is I2C SDA. 

Please help me to get to next step.Is LTC4291-1 fail now?

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