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CLK_32K脚位这个管脚不接时钟，接地会对功能上有影响么？例如呼吸灯效果等
HI
If external clock is not used on the application, connect the CLK_32K pin to GND to prevent floating of this pin and extra current consumption.
如果你不用外部CLK, 就会选用内部CLK, 对功能上没有影响, 差别只在于你的选择。对于选择外部CLK的优势，见datasheet 第17页 7.3.5.5
