VBUS_DET

Legacy Host

Adapter

CC

5.1

10%

k

±

W

TUSB321

R

900

1%

k

±

W

CC

To system VBUS detection

56 k

±5%

W

Copyright © 2016, Texas Instruments Incorporated

7

TUSB321

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SLLSEO6B – JUNE 2015 – REVISED SEPTEMBER 2016

Product Folder Links: TUSB321

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Copyright © 2015–2016, Texas Instruments Incorporated

7 Detailed Description

7.1 Overview

The USB Type-C ecosystem operates around a small form factor connector and cable that is flippable and

reversible. Because of the nature of the connector, a scheme is needed to determine the connector orientation.

Additional schemes are needed to determine when a USB port is attached and the acting role of the USB port

(DFP, UFP, DRP), as well as to communicate Type-C current capabilities. These schemes are implemented over

the CC pins according to the USB Type-C specifications. The TUSB321 device provides Configuration Channel

(CC) logic for determining USB port attach and detach, role detection, cable orientation, and Type-C current

mode. The TUSB321 device also contains several features such as VCONN sourcing, USB3.1 MUX direction

control, mode configuration and low standby current which make this device ideal for source or sinks in USB2.0

or USB3.1 applications.

7.1.1 Cables, Adapters, and Direct Connect Devices

Type-C Specification 1.1 defines several cables, plugs and receptacles to be used to attach ports. The TUSB321

device supports all cables, receptacles, and plugs. The TUSB321 device does not support e-marking.

7.1.1.1 USB Type-C Receptacles and Plugs

Below is list of Type-C receptacles and plugs supported by the TUSB321 device:

•

USB Type-C receptacle for USB2.0 and USB3.1 and full-featured platforms and devices

•

USB full-featured Type-C plug

•

USB2.0 Type-C plug

7.1.1.2 USB Type-C Cables

Below is a list of Type-C cables types supported by the TUSB321 device:

•

USB full-featured Type-C cable with USB3.1 full-featured plug

•

USB2.0 Type-C cable with USB2.0 plug

•

Captive cable with either a USB full-featured plug or USB2.0 plug

7.1.1.3 Legacy Cables and Adapters

The TUSB321 device supports legacy cable adapters as defined by the Type-C Specification. The cable adapter

must correspond to the mode configuration of the TUSB321 device.

Figure 3. Legacy Adapter Implementation Circuit

7.1.1.4 Direct Connect Devices

The TUSB321 device supports the attaching and detaching of a direct-connect device.