VBUS

Detect

SuperSpeed Hub

USB 2.0 Hub

Oscilator

XI

VSSOSC

XO

Clock

and

Reset

Distribution

Control

Registers

Boundary

Scan

Power

Distribution

JTAG_TRSTn

JTAG_TDI

JTAG_TDO

JTAG_TMS

JTAG_TCK

VDD33

VSS

GRSTz

I2C/

SMBUS

SCL/SMBCLK

SDA/SMDAT

SMBUSz

VDD11

GPIO

Block

PWRON0z_BATEN0

OVERCUR0z

SS

HS

HS_SUSPEND

SS_SUSPEND

FULLPWRMGMTz_SMBA1

TUSB8040

www.ti.com

SLLSE42F

– SEPTEMBER 2010 – REVISED OCTOBER 2011

1.3

Functional Block Diagram

The TUSB8040RKM (QFN) supports both per port or ganged power switching and over-current protection.

An individually port power controlled hub switches power on or off to each downstream port as requested

by the USB host. Also when a individually port power controlled hub senses an over-current event, power

to only 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

an SMBus host for vendor specific PID, VID, and strings. Ports can also be marked as disabled or

The TUSB8040PFP (QFP) is a reduced footprint hub that supports ganged power switching and

over-current protection only. 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

EEPROM or configuration via an SMBus host for vendor specific PID, VID, and strings. Ports can also be

EEPROM.

Figure 1-2. TUSB8040PFP Functional Block Diagram

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© 2010–2011, Texas Instruments Incorporated

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