Look a little closer
See the mechanism
The CC contact identifies the plugged-in orientation
Read the diagram steps
One orientation. The active cable configuration connection reaches receptacle CC1. The port uses orientation information to route the corresponding high-speed lanes.
Plug flipped. The configuration connection reaches CC2 instead. High-speed routing changes so that the device-side signal connection remains the same.
Original functional schematic; dimensions and motion are exaggerated, not measured. Conceptual groups, not a complete pinout. Power/ground groups correspond in both orientations; USB2 duplication is omitted. Mux architecture shown as one implementation, not a universal port capability.
Diagram basis: Texas Instruments: An Engineer’s Guide to USB Type-C, pp. 6–8.
Sources: Texas Instruments · Texas Instruments
Some connections are repeated
Power and ground contacts occupy corresponding positions in the reversible layout. The receptacle also provides duplicated USB 2.0 data contacts, with matching signals connected together. This preserves the connection when the plug turns over. The shell's symmetry works together with that electrical arrangement.
Sources: Texas Instruments
CC1 and CC2 reveal the orientation
The port monitors its configuration-channel contacts, CC1 and CC2. A controller such as TI's TUSB322I detects pullup or pulldown resistances to identify attachment, orientation and the port role. One small connection can therefore tell other circuitry how to arrange the larger signal path.
Sources: Texas Instruments
High-speed lanes can be switched
Higher-speed data pairs change positions when the plug flips. TI describes using a multiplexer to route the appropriate pair to the device's data circuitry. Simply joining every mirrored contact together would not preserve the required high-speed signal path.
Reversibility says how a connection can be made. The shared connector shape alone does not specify the data rate, display modes or charging power implemented by a particular port and cable.
Sources: Texas Instruments
The thing to remember
Reversible contacts make the fit possible; CC detection and routing make the signals arrive correctly.
What this example leaves out
This is a simplified Type-C explanation. Implemented protocols, cable wiring and power capabilities must be checked separately.
Sources & further reading
Source access dates are listed below. Manufacturer descriptions and patents support the specific constructions described, not every product.
- An Engineer’s Guide to USB Type-C — Basics of USB Type-C ↗
Texas Instruments · Retrieved 2026-10-18 · Near-symmetric contacts, orientation detection, duplicated USB 2.0 contacts and high-speed multiplexer routing.
Read pages 6–8, pinout Figure 1 and reversible-plug discussion Figure 2. No universal port speed, supported mode or wattage inferred from shell. - TUSB322I USB Type-C Configuration Channel Logic and Port Control ↗
Texas Instruments · Retrieved 2026-10-18 · CC1/CC2 resistor monitoring detects attachment, orientation and role.
Read Description and CC logic paragraphs. Specific controller example, not universal internal implementation.
