HD3SS3220_15 Datasheet, PDF (10/43 Pages) Texas Instruments – HD3SS3220 USB Type-C DRP Port Controller with SuperSpeed 2:1 MUX

HD3SS3220
SLLSES1 – DECEMBER 2015
7 Detailed Description
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7.1 Overview
The USB Type-C ecosystem operates around a small form factor connector and cable that is flippable and
reversible. Due to 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, determine the acting role of the USB
port (DFP, UFP, DRP), and communicate Type-C current capabilities. These schemes are implemented over the
CC pins according to the USB Type-C specifications. The HD3SS3220 provides Configuration Channel (CC)
logic for determining USB port attach/detach, role detection, cable orientation, and Type-C current mode. The
HD3SS3220 also contains several features such as VCONN sourcing, audio and debug accessory modes,
Try.SRC and Try.SNK DRP configurations which make this device ideal for source, sink or dual role applications
with USB 2.0 or USB 3.1.
HD3SS3220 has integrated USB 3.0/3.1 SS/SS+ MUX with 2 channel 2:1 switching required to handle cable
flips. The CC controller determines the orientation of the cable and controls the MUX selection. The device also
provides this orientation signal as a GPIO signal DIR that can be used in the system for increased flexibility and
features.
7.1.1 Cables, Adapters, and Direct Connect Devices
Type-C Specification defines several cables, plugs and receptacles to be used to attach ports. The HD3SS3220
supports all cables, receptacles, and plugs. The HD3SS3220 device does not support any USB feature which
requires USB Power Delivery (PD) communications over CC lines, such as e-marking or alternate mode.
7.1.1.1 USB Type-C receptacles and Plugs
The following is alist of Type-C receptacles and plugs supported by the HD3SS3220 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
The following is a list of Type-C cables supported by the HD3SS3220 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 HD3SS3220 supports legacy cable adapters as defined by the Type-C specifications. The cable adapter
must correspond to the mode configuration of the HD3SS3220 device.
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