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TUSB1210: ID引脚配置问题

Part Number: TUSB1210

TUSB1210作主机使用时,ID引脚该怎样处理,悬空还是下拉电阻接地,如果接地,下拉电阻的推荐值是多少(USB接口未USB2.0,无ID引脚,只有VBUS、DP、DM和GND四个引脚)