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Article 如果MAX8971的I2CIN管脚上有电压，但VIN管脚没有输入电压，是否可以通过I2C接口对芯片内的寄存器进行写入？

I2CIN管脚提供I2C接口的供电电压，而芯片内部寄存器只在VIN电压有效时才可以读/写。所以，即使I2CIN上电压有效，但是VIN电压在UVLO以下，I2C接口依然不能读/写任何数据。

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