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It is not recommended to switch between Bus- and Self-power design on-the-fly. A design decision must be made at design-time to go with a Bus-powered or self-powered design. Battery charging applications are outside the scope of this presentation. The USB specification requires a 4-wire cable that consists of: USBDP, USBDM, VBUS, and Signal Ground. The maximum length of a USB certified cable is 5 meters. Passive extension cables are not allowed by the specification.
PTM Published on: 2011-05-26
