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LP5811: I2C control exception

Part Number: LP5811

Tool/software:

I'd like to enquire about LP5811

I am currently using this device, but there have been some issues.

First write 01h to register 000h,and then write 0Ah to register 001h,and then result of reading back register 001h is 0A

But when I tested the VOUT voltage, it was still 3V

I don't know where the problem lies, is there a example code?