How the TYPE-C Interface Works
USB Type-C, it has a brand-new interface size, Type-C follows USB 3.1 standard, can insert positively and negatively, it is very convenient to use. And USB-C interface is faster, reaching 5Gbps or 10Gbps, with 100W power supply capability. The TYPE-C interface will be the direction of future electronic device interface development. What is its working principle?
TYPE-C source:
At the CES 2015, Intel demonstrated the power of USB 3.1 to the public in conjunction with the USB Implementers Forum. The specific interface used is USB Type C. It can be plugged in positively and negatively, and its size is almost the same as Micro-USB. In theory, USB 3.1 Type C can achieve 10Gbps transmission speed.
Parameters: Size 8.3mm x 2.5mm Speed 10Gbps
Interface pins
From the figure below, you can see the TYPE-C interface pin diagram. Each pin has a different role. The center point is symmetrical and therefore supports forward and reverse insertion.
TX/RX: Two sets of differential signals for data transmission
CC1/CC2: Two key pins, many functions
Probe connection to distinguish DFP, UFP
Vbus configuration with USB Type-c and USB Power Delivery (power output) modes
Vconn is configured. When there is a chip in the cable, one cc transmits the signal and one cc becomes the power supply Vconn.
Configure other modes, audio accessories, etc.
GND and VBus, 4 each, so the transmission power is strong
D+ and D- are standard before USB compatibility
Working master slaves are connected as follows
DFP is dominant, UFP is slave, and DRP can be master or slave, depending on what you pick up.
DFP CC pin pull-up resistor Rp, UFP pull-down resistor Rd. When not connected, DFP's VBUS has no output.
When the CC terminal is connected, the CC pin of the DFP detects the pull-down resistor Rd of the UFP, indicating that the DFP turns on the VBus switch to start supplying power. Which CC pin (CC1, CC2) detects the pull-down resistor to determine the direction of the interface to insert, by the way switch RX/TX.
Two CCs actually have only one cc line in a chipless cable. The cable containing the chip is not two cc lines, but a cc, a Vconn, used to power the chip in the cable (3.3V or 5V). At this time, there is no pull-down resistor Rd on the cc side. Pull-down resistor Ra, 800-1200 ohms.
The USB Type-C adds current detection and use functions. Three new current modes are added: The default USB power mode (500mA/900mA), 1.5A, 3.0A. Three current modes are transmitted and detected by the CC pin. For a DFP that needs a broadcast current output capability, a CC pull-up resistor Rp of a different value needs to be implemented. For a UFP, the voltage value on the CC pin needs to be detected to obtain the current output capability of the other DFP.
With the popularity of the USB Type-C interface, the Power Delivery (PD) protocol not only provides a unified, fast charging standard for all Type-C-enabled electronic devices including mobile phones, but also accelerates the development of battery direct charging solutions. universal. I believe that in the future, whether it is a computer or mobile phone charging cable to get one, audio and video lines are also unified to the TYPE-C interface, to achieve a true "take a gulp."
Noun annotation
DFP: Downstream Facing Port downlink port. Can be understood as Host, DFP provides VBUS, can also provide data. A typical DFP device is a power adapter because it will always only provide power. UFP: Upstream Facing Port) Upstream port. Can be understood as Device, UFP takes power from VBUS, and can provide data. Typical devices are U-disks, removable hard disks because they are always read data and power from VBUS. DRP: Dual Role port. DRP: DFP (Host), UFP (Device), and dynamic switching between DFP and UFP. A typical DRP device is a computer (the computer can be used as a USB host or as a charged device
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Post time: Jun-19-2018