Ruigu Electronic

Detect attach of USB ports，e.g. a DFP to a UFP

The DFP (Downstream Facing Port) is the host side, while the UFP (Upstream Facing Port) is the device side. A pull-up resistor Rp is connected to the CC pin on the DFP, while a pull-down resistor Rd is connected to the CC pin on the UFP. Before the DFP and UFP are connected, the DFP’s VBUS does not output power. When the DFP and UFP are connected, the CC pins touch. The DFP’s CC pin detects the UFP’s pull-down resistor Rd, indicating connection to a device. The DFP then turns on the FET switch for VBUS, supplying VBUS power to the UFP.

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