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TPS65917-Q1: Question about I2C communication

Part Number: TPS65917-Q1
Other Parts Discussed in Thread: TPS65917EVM

Hello, Teams

I am currently testing TPS65917EVM.

I have two questions.

First, which pin should I use for Vref? (IO_VIN)

Second, I have connected I2C SCL line to J7, I2C SDA line to J10, connected power supply to P16 and connected USB to MPS430.

I used 0x48 for my slave device address and 0x23 for my register address.

However, It seems like Acknowledge isn't generated by the slave and I have no idea why.

Any IDEA is appreciated.

I will look forward to your reply.

Thank you.