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AM335X OTG VBUS电路设计问题



USB 做HOST设备下的VBUS电源5V进入335X的VBUS管脚,需要一个1.2K/1%的电阻。这个电阻的作用是起到限流作用还是其他的?这个阻值的范围是多少?具体的硬件设计说明在AM335X数据手册的哪里?翻看手册都找不到理论依据,望给个有力回复,多谢指导。