HD3SS2522 Datasheet, PDF (13/25 Pages) Texas Instruments – USB Type-C SS MUX

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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
V_CC
AxP/N, BxP/N, CxP/N V_CM Voltage
CC_IN, CC_OUT, CC1, CC2
Control Pin Vmax for Low
Control Pin Vmax for High
HD3SS2522
SLLSEM6B – APRIL 2015 – REVISED AUGUST 2015
VALUE
3.3 V
0V–2V
0 V –3.3 V
0.8 V
2V
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.
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