USB Type-C (also referred to as USB-C or Type-C) interface has been widely promoted to be applied in mobile ,PC/tablet,hard disk,TV,wearable equipment,automotive devices,etc.

Compared with traditional USB interface,USB Type-C could achieve higher power transmission.The maximum charging power can ascend up to 100W(20V/5A) according to USB PD(Power Delivery) Specification.Meanwhile,USB Type-C’s also able to achieve more efficient data transmission,including intelligent digital audio,HD video,10Gbps high-speed data transmission,etc.

As the rapid development of USB power delivery(PD) tech, its necessary to define a common interface between Type-C Port Manager and Type-C Port Controller.

Figure 1 shows the connection between the USB Type-C Port Manager(TCPM) and three USB Type-C Port Controllers(TCPC). One TCPM could drive multiple TCPC according to the time constraint defined in USB PD specification.The connection between TCPM and TCPC is defined as USB Type-C Port Controller Interface.(hereinafter referred to as TCPCI)

Figure 1  USB Type-C Port Manager to USB Type-C Port Controller Interface
 

Abbreviation:

TCPCI is an interface between TCPC and TCPM.Such standard not only meets the requirement of USB Type-C PD specification,but also standardizes the communication between TCPC and TCPM.

TCPCI is aimed to provide a well defined interface between TCPC and TCPM ,so to simplify and standardize the implementation of the TCPM.

TCPC is a function block,which encapsulates VBUS and VCONN power control,USB Type-C CC logic,USB PD BMC physical layer and protocol layer instead of simple message creation.

The ET7303 is a USB Type-C and Power Delivery (PD) controller, which complies with USB Type-C™ 1.2 and Power Delivery (PD 3.0) Specifications. The ET7303 supports Type-C Port Control interface (TCPCI).The ET7303 integrates a complete Type-C transceiver including the Type-C termination resistors, Rp and Rd, and enables the USB Type-C detection including attach and orientation.

Figure 2. Configuration Channel Switch

The ET7303 integrates the physical layer of the USB BMC PD (Power Delivery) protocol to allow up to 100W of power and role swap. The BMC PD block enables full support for alternative interfaces of the Type-C specification. The block diagram’s shown in Figure 3 and Figure 4.

Figure 3. ET7303 BMC Transmitter Block Diagram

Figure 4. ET7303 BMC Receiver Block Diagram

As shown in Figure 5,CC1/CC2 pin’s quite close to VBUS pin on Type-C connector,which may cause short circuit easily during the process of cable plugging.Thus,the voltage appeared on CC1/CC2 pin may reach up to 20V.To ensure reliability ,the maximum withstand voltage of ET7303’s CC pin is 24V.

Figure 5. Pin configuration diagram of socket from outside to inside
 

Application circuit diagram:

Features

• 
• PD-Compatible Dual-Role
• Support USB PD2.0 and TCPC1.0
• CC Pin 28V Short-VBUS Circuit Protection
• Current Capability Definition and Detection
• Dead Battery and No Battery Support
• Low-Power Mode for Attach Detection
• BIST Mode Supported
• WLCSP9 Package (1.38x1.34mm)