SLLSEO6C June 2015 – August 2018 TUSB321
The TUSB321 device supports VBUS detection according to the Type-C Specification. VBUS detection is used to determine the attachment and detachment of a UFP. VBUS detection is also used to successfully resolve the role in DRP mode.
The system VBUS voltage must be routed through a RVBUS resistor to the VBUS_DET pin on the TUSB321 device if the PORT pin is configured as a DRP or a UFP. If the TUSB321 device is configured as a DFP and only ever used in DFP mode, the VBUS_DET pin can be left unconnected.