HD3SS3220_15 Datasheet, PDF (13/43 Pages) Texas Instruments – HD3SS3220 USB Type-C DRP Port Controller with SuperSpeed 2:1 MUX

www.ti.com
HD3SS3220
SLLSES1 – DECEMBER 2015
7.3 Feature Description
The HD3SS3220 can be configured as a DFP, UFP, or DRP using the 3-level PORT pin. The PORT pin should
be strapped high to VDD5 using a pull-up resistance to achieve DFP mode, low to GND for UFP mode or left
floating for DRP mode on the PCB. This flexibility allows the HD3SS3220 to be used in a variety of applications.
The HD3SS3220 samples the PORT pin after reset and maintains the desired mode until the HD3SS3220 is
reset again. It shall be static. Table 1 shows the supported features in each mode.
Table 1. Supported Features for HD3SS3220 by Mode
PORT PIN
Supported Features
Port Attach/Detach
Cable Orientation
Current Advertisement
Current Detection
Audio Accessory
Debug Accessory Modes
Active Cable Detection
Try.SRC
Try.SNK
I2C/GPIO
Legacy Cables
VBUS Detection
VCONN
USB 3.1 G1 and G2 SS mux
Adaptive common mode tracking for SS channels
High
DFP Only
√
√
√
√
√
√
√
√
√
√
√
Low
UFP Only
√
√
√
√
√
√
√
√
√
√
NC
DRP
√
√
√(DFP)
√(UFP)
√
√
√(DFP)
√
√
√
√
√(UFP)
√(DFP)
√
√
7.3.1 DFP/Source – Downstream Facing Port
The HD3SS3220 can be configured as a DFP only by pulling the PORT pin high through a resistance to VDD.
The HD3SS3220 device can also be configured as a DFP-only device by changing the MODE_SELECT register
default setting with PORT pin left floating. In DFP mode, the HD3SS3220 constantly presents R_(p) on both CC
lines. In this mode, the HD3SS3220 will initially advertise default USB Type-C current. The Type-C current can
be adjusted through CURRENT_MODE pin or I²C if the system wishes to increase the current advertisement.
The HD3SS3220 will adjust the R_(p) resistors to match the desired advertisement.
A DFP monitors the voltage level on the CC pins looking for the R_(d) termination of a UFP. When a UFP is
detected and HD3SS3220 is in the attached. SRC state, the HD3SS3220 pulls the ID pin low to indicate to the
system the port is attached to a device (UFP). Additionally, when a UFP is detected, the HD3SS3220 supplies
VCONN on the unconnected CC pin if R_(a) is also detected.
The following list describes the steps for enabling DFP through I²C:
1. Write a 1'b1 to DISABLE_TERM register (address 0x0A bit 0)
2. Write a 2'b10 to MODE_SELECT register (address 0x0A bits 5:4)
3. Write a 1'b0 to DISABLE_TERM register (address 0x0A bit 0)
When configured as a DFP, the HD3SS3220 can operate with older USB Type-C 1.0 devices except for a USB
Type-C 1.0 DRP device. The HD3SS3220 cannot 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.
7.3.2 UFP/Sink – Upstream Facing Port
The HD3SS3220 can be configured as a UFP only by pulling the PORT pin low to GND. In UFP mode, the
HD3SS3220 constantly presents Rd (pull-down resistors) on both CC pins.
Copyright © 2015, Texas Instruments Incorporated
Product Folder Links: HD3SS3220
Submit Documentation Feedback
13