USB Type-C pin definition

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USB Type-C pin definition

To understand the principle of Type-C, you first need to understand his PIN pin definition. The Type-C port has 4 pairs of TX/RX differential lines, 2 pairs of USBD+/D-, a pair of SBUs, 2 CCs, and 4 VBUSs and 4 ground lines.

Under normal circumstances, USB3.1 only uses 2 pairs of TX/RX differential lines as data lines, TX1/RX1 when plugged in, and TX2/RX2 when plugged in. You can see that there are 2 pairs of differential lines in any case. It is not used. The DP alternate mode is to load the DP signal onto the two pairs of "extra" differential lines, so that USB 3.1+DP works simultaneously.

Of course, if the receiver only needs the DP signal and does not need the USB 3.1 signal, then the DP can use all 4 pairs of TX/RX differential lines for output, thus achieving up to 4 lanes of DP output, providing a total output bandwidth of up to 32.4 Gbps (each Lane can output 8.IGbps), easy to achieve 5Kx3K60 auxiliary video, even up to 8K × 4K 60 frames of video (4:2:0 data), this mode is DPonly mode, in addition to compatible with USB2.0, Type-C The USBD+/D- signal is also reserved for USB 2.0 devices, so you only need to use the Type-C interface. USB2.0 or even USB 1.0 devices can also support the front and back. It is worth mentioning that using USBD+/D- with the above DP only mode, DP+USB2.0 mode can be realized. DP occupies 4 pairs of TX/RX differential lines, and USB only uses D+/D-.

Type-C also provides 2 CC lines and 2 SBU lines. The CC line is mainly used for communication of the Power Delivery module (hereinafter referred to as PD). The CC line is first used to insert the device into the direction of the device: the plug is inserted in reverse. If it is positively inserted, the host uses CC1 to communicate with the device. Using CC2, you can see that the CC uses a single-wire protocol. When the DP function is turned on, the SUX line is the AUX_P/AUX_N differential line in the DP protocol (its polarity can be modified according to the forward and reverse insertion directions), which is responsible for transmission. Key information such as DPCD, EDID of the device.