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UCD3138不使用的管脚能否直接悬空?PCB空间有限

Other Parts Discussed in Thread: UCD3138

UCD3138不使用的管脚能否直接悬空?PCB空间有限。若不能,需要如何处理,能否管脚直接接地,还是需要通过电阻下拉到地?