1 Features

• Four port USB 3.2 x1 Gen1 (5Gbps) hub

• USB 2.0 hub features

– Multiple transaction translator (MTT) hub: four

transaction translators

– Two asynchronous endpoint buffers per

transaction translator

• Supports battery charging:

– Supports D+/D– divider charging port (ACP1,

ACP2, and ACP3) when the upstream port is

unconnected or not configured

– Supports automatic mode for transition

between DCP or ACP modes when the

upstream port is unconnected

– Supports galaxy charging

– CDP mode (upstream port connected)

– DCP mode (upstream port unconnected)

– DCP mode complies with Chinese

telecommunications industry standard YD/T

1591-2009

• Supports operation as a USB 3.2 x1 Gen1 or USB

2.0 compound device

• Per port or ganged power switching and

overcurrent notification inputs

• Supports four external downstream ports

• Supports vendor requests to read and write I2C

and EEPROM read at 100k

• I2C controller supports clock stretching

• OTP ROM, Serial EEPROM or I2C/SMBus target

interface for custom configurations:

– VID and PID

– Port customizations

– Manufacturer and product strings (not by OTP

ROM)

– Serial number (not by OTP ROM)

• Application Feature selection using pin selection or

EEPROM or I2C/SMBus target interface

• Provides 128-bit Universally Unique Identifier

(UUID)

• Single clock input, 24MHz crystal or oscillator

• Downstream ports configurable to USB 2.0 only

• 64-pin QFN package (RGC)

2 Applications

• Computer systems

• Docking stations

• Monitors

• Set-top boxes

3 Description

The TUSB8042A is a four-port USB 3.2 x1 Gen1

(5Gbps) hub. The device provides simultaneous

SuperSpeed USB, high-speed, or full-speed

connections on the upstream port. The device

also provides SuperSpeed USB, high-speed, fullspeed,

or low-speed connections on the downstream

port. When the upstream port is connected to an

electrical environment that only supports high-speed,

full-speed, or low-speed connections, SuperSpeed

USB connectivity is disabled on the downstream

ports.

When the upstream port is connected to an electrical

environment that only supports full-speed or lowspeed

connections, SuperSpeed USB and high-speed

connectivity are disabled on the downstream ports.

The TUSB8042A supports per port or ganged power

switching and overcurrent protection, and supports

battery charging applications.

An individually port power controlled hub switches

power on or off to each downstream port as requested

by the USB host. Also when an individually port power

controlled hub senses an overcurrent event, only

power to the affected downstream port is switched off.

A ganged hub switches on power for all the

downstream ports when power is required for any

port. The power to the downstream ports is not

switched off unless all ports are in a state that allows

power to be removed. Also when a ganged hub

senses an overcurrent event, power to all downstream

ports is switched off.