TUSB422IYFPR datasheet(10/71 Pages) TI1

10 / 71 page

CC1

SDA

SCL

VCONN

GND

I2C

Slave

(FM+)

VDD

OSC

FIFO

4b5b

encode

32-bit

CRC

BMC

encode

CC2

FIFO

4b5b

decode

32-bit

CRC

BMC

decode

CC1_PD_CTL

CC2_PD_CTL

VCONN_EN

CC2_RD_RP

CC1_RD_RP

Cable Detection

And

Orientation

Configuration

And

Status

Registers

BMC_CLK

VBUS

Detection

ADC

VBUSIN

INT_N

VBUSDIS_EN

Rvbusdis

Def_Cur2

Med_Cur2

Hi_Cur2

Def_Cur1

Med_Cur1

Hi_Cur1

Rvcn_dis

VCNDIS_EN

LDO

Internal_VDD

CC1_RD_RA

CC2_RD_RA

TUSB422

SLLSEW6 – NOVEMBER 2016

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Product Folder Links: TUSB422

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7 Detailed Description

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 (Source, Sink, active cable, audio accessory, debug accessory), and communicate Type-C current

capabilities. These schemes are implemented over the CC pins according to the USB Type-C Specification 1.2.

The TUSB422 provides Configuration Channel (CC) logic for determining USB port attach and detach, role

detection, cable orientation, and Type-C Current detection/advertisement. The TUSB422 also contains several

features such as VCONN sourcing, VBUS enable, VBUS discharge enable, detection of vSafe0V, and low

standby current.

The TUSB422 provides a USB Type-C Port Controller Interface (TCPCi) allowing the USB Type-C Port Manager

(TCPM) residing in an external microprocessor the ability to determine when a port partner is attached or

removed, cable orientation, enable or remove power to the Type-C port. The TUSB422 implements a USB PD

BMC physical layer and protocol layer for communication over the Type-C port for purposes like power

negotiations, alternate mode enablement (ie DisplayPort over Type-C), and data role negotiations just to mention

a few. The TUSB422 takes a message provided by external processor, calculate and append a 32-bit CRC,

encode, and transmit the encoded message over the CC wire in the cable. The TUSB422 also receives data

from the CC wire and determined if packet is valid or not, respond with GoodCRC, and notify external processor

of its arrival by asserting the interrupt (INT_N).

7.2 Functional Block Diagram

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