TUSB8040A1 Datasheet, PDF (9/38 Pages) Texas Instruments – Four-Port USB 3.0 Hub

TUSB8040A1
www.ti.com
SLLSEE5A – FEBRUARY 2013 – REVISED MAY 2013
1.4 Functional Description
The TUSB8040A1 supports 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 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.
The TUSB8040A1 also provides customization using an I²C EEPROM or configuration via an SMBus host
for vendor specific PID, VID, and strings. For the TUSB8040A1 ports can also be marked as disabled or
permanently attached using pin selection, I²C EEPROM or an SMBus host. The Device Status and
Command Register at F8h cannot be modified by the contents of the I²C EEPROM.
VDD33
VDD
VSS
VSSA
Power
Distribution
XI
VSSOSC
XO
Oscilator
USB 2.0 Hub
VBUS
Detect
SuperSpeed Hub
GRSTn
Clock
and
Reset
Distribution
SS
SS_SUSPEND
HS
HS_SUSPEND
PORTINDz_SMBA3
GANGEDz_SMBA2
FULLPWRMGMTz_SMBA1
LEDG3z_USED
LEDA3z_RMBL
OVERCUR3z
PWRON3z_BATEN 3
LEDG2z_USED
LEDA2z_RMBL
OVERCUR2z
PWRON2z_BATEN 2
LEDG1z_USED
LEDA1z_RMBL
OVERCUR1z
PWRON1z_BATEN 1
LEDG0z_USED
LEDA0z_RMBL
OVERCUR0z
PWRON0z_BATEN 0
GPIO
Block
Control
Registers
Figure 1-2. TUSB8040A1 Functional Block Diagram
I2C/
SMBUS
SCL/SMBCLK
SDA/SMDAT
SMBUSz
Boundary
Scan
JTAG_TRSTn
JTAG_TDI
JTAG_TDO
JTAG_TMS
JTAG _TCK
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