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July 2022

Diodes Incorporated

PI2DPX2020

Document Number DS43506 Rev 5-2

DisplayPort AUX Channel

The AUX CH of DP is a half-duplex, bidirectional channel. The DP device with DPTX such as a Source device is the master of the AUX

CH (called AUX CH Requester), while the device with DPRX such as a Sink device is the slave (AUX CH Replier). As the master, the

Source device must initiate a Request Transaction, to which the Sink device responds with a Reply Transaction. The system design of a

DFP_D on a USB Type-C connector connected to a UFP_D on a USB Type-C connector using a USB Type-C to USB Type-C Cable. The

2MΩ pull-down resistors on SBU1 and SBU2 are representative of the leakage of ESD and EMI/RFI components including termination

to ensure no floating nodes, and are intended to show compliance with SBU Termination in USB Type-C r1.1. The plug orientation

switch may be replaced by AUX polarity inversion logic in the DisplayPort transmitter or receiver, controlled by the plug orientation

detection mechanism associated with the USB Type-C Receptacle. Note: The 3.3V levels in the Adapters are derived from VCONN

because not all DisplayPort UFP_D devices provide DP_PWR.

1M

1M

10-105k

C_AUX

AUX+

AUX-

Source

Connector

Sink

Connector

Tx

Tx

Rx

Rx

C_AUX

C_AUX

C_AUX

10-105k

50

50

Vbias_Tx

2.5~3.3V

50

50

Vbias_Rx

DP_PWR

Figure 3. DisplayPort AUX Channel Connection