VBUS

Detect

SuperSpeed Hub

USB 2.0 Hub

Oscilator

XI

VSSOSC

XO

Clock

and

Reset

Distribution

Control

Registers

GPIO

Block

Boundary

Scan

Power

Distribution

JTAG_TRSTn

JTAG_TDI

JTAG_TDO

JTAG_TMS

JTAG_TCK

VDD33

VDD18

VSS

GRSTn

VSSA

I2C/

SMBUS

SCL/SMBCLK

SDA/SMDAT

SMBUSz

PWRON0z_BATEN0

OVERCUR0z

LEDA0z_RMBL

LEDG0z_USED

PWRON1z_BATEN1

OVERCUR1z

LEDA1z_RMBL

LEDG1z_USED

PWRON2z_BATEN2

OVERCUR2z

LEDA2z_RMBL

LEDG2z_USED

PWRON3z_BATEN3

OVERCUR3z

LEDA3z_RMBL

LEDG3z_USED

SS

HS

HS_SUSPEND

SS_SUSPEND

GANGEDz_SMBA2

PORTINDz_SMBA3

FULLPWRMGMTz_SMBA1

VDD11

TUSB8020A, TUSB8040A

www.ti.com

SLLSEA7B – MAY 2012 – REVISED AUGUST 2012

1.4

Functional Description

The TUSB80x0ARKM supports per port or ganged power switching and over-current protection. The

TUSB80x0APFP provides only ganged mode support.

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 over-current event, only

power to the affected downstream port will be switched off.

A ganged hub switches on power to all its downstream ports when power is required to be on 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 over-current event, power to all downstream ports will be

switched off.

for vendor specific PID, VID, and strings. For the TUSB80x0ARKM ports can also be marked as disabled

Figure 1-2. TUSB8040ARKM Functional Block Diagram

Copyright © 2012, Texas Instruments Incorporated

PRODUCT OVERVIEW

7

Submit Documentation Feedback

Product Folder Links: TUSB8020A TUSB8040A