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TUSB320HI, TUSB320LI

SLLSEP2B – AUGUST 2015 – REVISED SEPTEMBER 2016

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Product Folder Links: TUSB320HI TUSB320LI

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Copyright © 2015–2016, Texas Instruments Incorporated

Feature Description (continued)

Table 1. Supported Features for the TUSB320 Device by Mode

PORT PIN

HIGH

(DFP ONLY)

LOW

(UFP ONLY)

NC

(DRP)

SUPPORTED

FEATURES

Port attach and

detach

Yes

Yes

Yes

Cable orientation

Yes

Yes

Yes

Current advertisement

Yes

-

Yes (DFP)

Current detection

-

Yes

Yes (UFP)

Accessory modes

(audio and debug)

Yes

Yes

Yes

Try.SRC

-

-

Yes

Try.SNK

-

-

Yes

Active cable detection

Yes

-

Yes (DFP)

Yes

Yes

Yes

Legacy cables

Yes

Yes

Yes

-

Yes

Yes (UFP)

7.2.1.1 Downstream Facing Port (DFP) - Source

The TUSB320 device can be configured as a DFP only by pulling the PORT pin high through a resistance to

system needs to increase the amount advertised. The TUSB320 device adjusts the Rps to match the desired

Type-C current advertisement. In GPIO mode, the TUSB320 device only advertises default Type-C current.

When configured as a DFP, the TUSB320 can operate with older USB Type-C 1.0 devices except for a USB

Type-C 1.0 DRP device. A USB Type-C 1.1 compliant DFP can not connect to a Type-C 1.0 DRP. Because the

TUSB320 is compliant to Type-C 1.1, the TUSB320 can not operate with a USB Type-C 1.0 DRP device. This

limitation is a result of a backwards compatibility problem between USB Type-C 1.1 DFP and a USB Type-C 1.0

DRP.

7.2.1.2 Upstream Facing Port (UFP) - Sink

The TUSB320 device can be configured as a UFP only by pulling the PORT pin low to GND. In UFP mode, the

TUSB320 device constantly presents pulldown resistors (Rd) on both CC pins. The TUSB320 device monitors

the CC pins for the voltage level corresponding to the Type-C mode current advertisement by the connected

a UFP, the TUSB320 device detects and communicates the advertised current level of the DFP to the system

one time in the Attached.SNK state.

7.2.1.3 Dual Role Port (DRP)

The TUSB320 device can be configured to operate as a DRP when the PORT pin is left floated on the PCB. In

DRP mode, the TUSB320 device toggles between operating as a DFP and a UFP. When functioning as a DFP in

DRP mode, the TUSB320 device complies with all operations as defined for a DFP according to the Type-C

Specification. When presenting as a UFP in DRP mode, the TUSB320 device operates as defined for a UFP

according to the Type-C Specification.