Contents
What is upstream facing port?
The upstream-facing port (UFP), which connects to a host or DFP of a hub, receives the data on a device or hub. These ports usually sink VBUS. An example of an application that may include a UFP is a display monitor. • The dual-role data (DRD) port can operate as either a DFP (host) or a UFP (device).
What is SBU Type C?
Side band use (SBU) is not for USB, but is open for Alternate Mode, such as DisplayPort over Type-C. Host- mode is used by a USB master. The port that supports host-mode is a downstream facing port (DFP). Device-mode is used by a USB slave. The port that supports device-mode is an upstream facing port (UFP).
What is the difference between USB upstream and downstream?
The upstream port is used to connect the monitor to the computer. The downstream port is used to connect the monitor to USB devices.
Where are the CC1 and CC2 pins on a USB?
The DFP pulls up the CC1 and CC2 pins through the Rp resistors but the UFP pulls them down through Rd. If no cable is attached, the source sees a logic high at CC1 and CC2 pins. Connecting the USB Type-C cable creates a current path from 5-V supply to ground.
What do you need to know about USB Type C?
USB Type-C is a specification for a USB connector system that is gaining popularity across smartphones and mobile devices and is capable of both power delivery and data transmission. Unlike its USB predecessors, it’s also flippable—so you don’t need to try three times to plug it in. A USB Type-C port. Image courtesy of Denys Vitali
What’s the maximum power of a USB Type C?
The Power Delivery allows VBUS to have a voltage up to 20 V. The maximum current could be also raised up to 5 A. Hence, the USB Type-C could deliver a maximum power of 100 W.
How is the USB cable connected to the ground?
Connecting the USB Type-C cable creates a current path from 5-V supply to ground. Since there’s only one CC wire inside the USB Type-C cable, only one current path is formed. For example, in the upper graphic of Figure 4, the CC1 pin of the DFP is connected to the CC1 pin of the UFP.