14

TUSB321

SLLSEO6B – JUNE 2015 – REVISED SEPTEMBER 2016

www.ti.com

Product Folder Links: TUSB321

Submit Documentation Feedback

Copyright © 2015–2016, Texas Instruments Incorporated

Typical Application (continued)

8.2.1.1 Design Requirements

For this design example, use the parameters listed in Table 4:

Table 4. Design Requirements for DFP Mode

DESIGN PARAMETER

VALUE

5 V

Type-C port type (UFP, DFP, or DRP)

DFP

PORT pin is pulled up

Advertised Type-C Current (Default, 1.5 A, 3.0 A)

3.0 A

VCONN Support

Yes

8.2.1.2 Detailed Design Procedure

of 10 µF to 220 µF.

The TUSB321 current advertisement is determined by the state of the CURRENT_MODE pin. In this particular

resistor.

The DIR pin is used to control the MUX for connecting the USB3 SS signals to the appropriate pins on the USB

Type-C receptacle. In this particular case, a HD3SS3212 is used as the MUX. In order to minimize crossing in

routing the USB3 SS signals to the USB Type C connector, the connection of CC1 and CC2 to the TUSB321 is

swapped.

The Type-C port mode is determined by the state of the PORT pin. When the PORT pin is pulled high, the

TUSB321 device is in DFP mode.

systems. This resistor along with internal pulldown keeps the voltage observed by the TUSB321 device in the

recommended range.

TUSB321 device in a DFP mode, a bulk capacitance of at least 120 µF is required. In this particular case, a 150-

µF capacitor was chosen.

8.2.1.3 Application Curve

Figure 5. Application Curve for DFP Mode