HD3SS2522

www.ti.com

SLLSEM6B – APRIL 2015 – REVISED AUGUST 2015

USB Type-C DFP Typical Application (continued)

8.2.1 Design Requirements

For this design example, use the parameters shown in Table 1.

Table 1. Design Parameters

PARAMETER

VALUE

VCC

3.3 V

AxP/N, BxP/N, CxP/N VCM Voltage

0 V – 2 V

CC_IN, CC_OUT, CC1, CC2

0 V –3.3 V

Control Pin Vmax for Low

0.8 V

Control Pin Vmax for High

2 V

8.2.2 Detailed Design Procedure

8.2.2.1 USB Type-C Current Advertising

HD3SS2522 can be used to advertise USB Type-C current in conjunction with pull up resistors to CC1 and CC2

pins. These pull up resistors must meet the Type C spec requirements. The IMODE1 and IMODE2 setting must

match the CC resistor configuration for the current mode: default, mid or high.

8.2.2.2 VCONN and VBUS Power Switch Control

VCTRL1# and VCTRL2# are outputs from the HD3SS2522 CC controller to enable or disable the VCONN switch

based upon the orientation detection, audio accessory termination Ra detection, and/or fault condition.

VBUS_EN is an output from the HD3SS2522 CC controller to enable VBUS switch. Upon detection of UFP

attachment, the VBUS_EN is asserted to enable VBUS switch.

8.2.2.3 Firmware Upgradability

If necessary, the CC controller firmware (FW) can be updated via GPIO1, GPIO2 and SYS_COM_REQ. Contact

Texas Instruments for further assistance with upgrading the FW.

8.2.3 USB Type-C DFP Circuit Schematics with a Type C Receptacle

The schematics below depicts the circuit level implementation of the Type C system with HD3SS2522 and a DFP

only Type C connector. The system should select a power switch that complies with the Type C specification and

application requirements. The power switch can be controlled by the HD3SS2522. See the Detailed Design

Procedure section of the datasheet for design details.

Copyright © 2015, Texas Instruments Incorporated

Submit Documentation Feedback

13

Product Folder Links: HD3SS2522