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Type-C Interface Protocol

The common pin counts for Type-C connectors are 6P, 12P, 16P, and 24P. Different pin counts have differences in functionality, application scenarios, and costs. Here is a detailed introduction:

1 Pin Definitions#

The pin function definitions for the Type-C connector are as follows:

PinNameFunction Description
A1GNDGround
A2SSTXp1SuperSpeed differential signal #1, TX, positive
A3SSTXn1SuperSpeed differential signal #1, TX, negative
A4VBUSBus power
A5CC1Configuration channel, used for detecting device connection, orientation, and for USB Power Delivery communication
A6Dp1USB 2.0 differential signal, position 1, positive
A7Dn1USB 2.0 differential signal, position 1, negative
A8SBU1Sideband use (SBU), used for transmitting non-USB signals, such as audio signals
A9VBUSBus power
A10SSRXn2SuperSpeed differential signal #2, RX, negative
A11SSRXp2SuperSpeed differential signal #2, RX, positive
A12GNDGround
B1GNDGround
B2SSTXp2SuperSpeed differential signal #2, TX, positive
B3SSTXn2SuperSpeed differential signal #2, TX, negative
B4VBUSBus power
B5CC2Configuration channel
B6Dp2USB 2.0 differential signal, position 2, positive
B7Dn2USB 2.0 differential signal, position 2, negative
B8SBU2Sideband use (SBU)
B9VBUSBus power
B10SSRXn1SuperSpeed differential signal #1, RX, negative
B11SSRXp1SuperSpeed differential signal #1, RX, positive
B12GNDGround

2 Differences Between Type-C Connectors with Different Pin Counts#

  1. 6P Type-C
    • Function: Retains only Vbus, GND, CC1, and CC2. Vbus is used for power supply, GND is for grounding, and CC1 and CC2 are used for PD device identification, carrying USB-PD communication to request power supply from the power source. It lacks USB 2.0's D+ and D- differential signals and USB 3.0's high-speed transmission capabilities.
    • Application Scenarios: Suitable for devices that do not require USB communication and only need USB for power charging, such as toys, electric toothbrushes, fast charging plugs, etc.
    • Cost: Due to the fewer number of pins, the production process is relatively simple, resulting in lower costs.
  2. 12P Type-C
    • Function: Adds data DP1/2, DN1/2, SBU1/2 on top of the 6P. DP1/2 and DN1/2 are used for USB 2.0 communication, enabling data transmission; SBU1/2 is used for transmitting non-USB signals, such as audio signals. It supports PD fast charging, audio devices, HDMI transmission, debugging mode, etc., but lacks USB 3.0/3.1 high-speed transmission capability.
    • Application Scenarios: Commonly used in small household appliances that do not have high data transmission speed requirements but need to support multiple functions. The MCUs used in these devices typically only support USB 2.0, making USB 3.0 functionality unnecessary.
    • Cost: Compared to 24P, it saves some pins and related circuits, reducing costs, but is higher than 6P.
  3. 16P Type-C
    • Function: Cuts down USB 3.0's TX1/2, RX1/2 from the 24P, retaining SBU1/2, CC1/2, and USB 2.0's D+ and D-. Aside from lacking USB 3.0/3.1 high-speed transmission, other functions are basically the same as 24P, also supporting PD fast charging, audio devices, HDMI transmission, debugging mode, etc.
    • Application Scenarios: Suitable for devices with low requirements for high-speed data transmission, able to meet basic functionality while controlling costs.
  4. 24P Type-C
    • Function: This is a fully functional Type-C interface, possessing all the features of the 12P pins, plus USB 3.0/3.1 high-speed transmission capabilities. Its D+/D- provides compatibility with USB 2.0 data transmission differential pairs, having two sets of D+/D- differential pairs to support reversible insertion; GND and VBUS are used to provide ground and power signals, respectively, with a default VBUS voltage of 5V, supporting higher voltages and currents through negotiation; RX and TX are separated, allowing for full-duplex communication in both upstream and downstream directions; the CC pins are used for plug detection, orientation detection, current support capability reporting at the source end, and for use in PD fast charging and alternate modes; VCONN powers the EMarker chip contained within the Type-C cable.
    • Application Scenarios: Widely used in various electronic devices that require high-speed data transmission and support for multiple functions, such as smartphones, tablets, laptops, monitors, etc.
    • Cost: Due to the large number of pins and rich functionality, the procurement cost of this interface is relatively high.
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