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

Not Recommended for New Designs

TUSB8040

www.ti.com

SLLSE42I – SEPTEMBER 2010 – REVISED SEPTEMBER 2013

1.3

Functional Block Diagram

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

to all downstream ports will be switched off. The TUSB8040PFP also provides customization using an I2C

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

marked as disabled or permanently attached using an I2C EEPROM or an SMBus host.

The Device Status and Command Register at F8h cannot be modified by the contents of the I2C

EEPROM.

Figure 1-2. TUSB8040PFP Functional Block Diagram

Copyright © 2010–2013, Texas Instruments Incorporated

PIN DESCRIPTIONS

7

Submit Documentation Feedback

Product Folder Links: TUSB8040