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你可以在Datasheet第3页，找到I2C口的设置方式。
Dual function pin. When I2C is not used (for example, BRTMODE = 00b), this pin can be used to set ƒSW and/or ƒPWM by connecting a resistor from this pin to a ground reference. When I2C is used (for FSET/SDA A3 I/O example, BRTMODE = 01, 10 or 11), connect this pin to an SDA line of an I2C bus. The LP8557 "PWM Only" device option uses this pin as an FSET pin. LP8557I "PWM and I2C" device option uses this pin as an SDA pin.
