Rp

Rp

CC

Rp

Rp

Ra

Ra

Cable

Source monitors for

connection

Source monitors for

connection

Sink monitors for

connection

Sink monitors for

connection

11

TPS25820, TPS25821

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SLVSE24 – NOVEMBER 2017

Product Folder Links: TPS25820 TPS25821

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Copyright © 2017, Texas Instruments Incorporated

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Enhances flexibility and ease of use

Typical flow of DFP to UFP configuration is shown in Figure 8:

Figure 8. DFP to UFP Connect Flow

7.1.3 Detecting a Connection

Sources and DRPs fulfill the role of detecting a valid connection over USB Type-C. Figure 9 shows a Source to

Sink connection made with Type-C cable. As shown in Figure 9, the detection concept is based on being able to

detect terminations in the product which has been attached. A pull-up and pull-down termination model is used. A

pull-up termination can be replaced by a current source.

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In the Source-Sink connection the Source monitors both CC pins for a voltage lower than the unterminated

voltage.

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A Sink advertises Rd on both its CC pins (CC1 and CC2).

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Figure 9. Source-Sink Connection Mechanism