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Audio Adapter Accessory Mode
In this mode, all digital circuits are disconnected from the connector, and certain pins become reassigned for analog outputs or inputs. The mode, if supported, is entered when both CC pins are shorted to GND. D− and D+ become audio output left L and right R, respectively. The SBU pins become a microphone pin MIC, and the analog ground AGND, the latter being a return path for both outputs and the microphone. Nevertheless, the MIC and AGND pins must have automatic swap capability, for two reasons: firstly, the USB-C plug may be inserted either side; secondly, there is no agreement, which TRRS rings shall be GND and MIC, so devices equipped with a headphone jack with microphone input must be able to perform this swap anyway.[60]
This mode also allows concurrent charging of a device exposing the analog audio interface (through VBUS and GND), however only at 5 V and 500 mA, as CC pins are unavailable for any negotiation.
GND TX1+ TX1− VBUS CC1 R L MIC VBUS RX2− RX2+ GND
GND RX1+ RX1− VBUS AGND L R CC2 VBUS TX2− TX2+ GND
TRRS rings wiring to Type-C male plug (Figure A-2 of USB Type-C Cable and Connector Specification Release 1.3)
TRRS socket Analog audio signal USB Type-C male plug
Tip L D−
Ring 1 R D+
Ring 2 Microphone/ground SBU1 or SBU2
Sleeve Microphone/ground SBU2 or SBU1
DETECT1 Plug presence detection switch CC, VCONN
DETECT2 Plug presence detection switch GND