Datasheet

VBUS
Detect
SuperSpeed HubUSB 2.0 Hub
USB_DP_UP
USB_SSRXP_UP
USB_SSRXM_UP
USB_SSTXP_UP
USB_SSTXM_UP
USB_DM_UP
USB_SSRXP_DN0
USB_SSRXM_DN0
USB_SSTXP_DN0
USB_SSTXM_DN0
USB_SSRXP_DN1
USB_SSRXM_DN1
USB_SSTXP_DN1
USB_SSTXM_DN1
USB_SSRXP_DN2
USB_SSRXM_DN2
USB_SSTXP_DN2
USB_SSTXM_DN2
USB_SSRXP_DN3
USB_SSRXM_DN3
USB_SSTXP_DN3
USB_SSTXM_DN3
USB_DP_DN0
USB_DM_DN0
USB_DP_DN1
USB_DM_DN1
USB_DP_DN2
USB_DM_DN2
USB_DP_DN3
USB_DM_DN3
Oscilator
USB_R1
USB_R1RTN
USB_VBUS
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
TUSB8040A
www.ti.com SLLSEA7F –MAY 2012–REVISED SEPTEMBER 2013
1.4 Functional Description
The TUSB8040A 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 TUSB8040A also provides customization using an I
2
C EEPROM or configuration via an SMBus host
for vendor specific PID, VID, and strings. For the TUSB8040A ports can also be marked as disabled or
permanently attached using pin selection, I
2
C EEPROM or an SMBus host. The Device Status and
Command Register at F8h cannot be modified by the contents of the I
2
C EEPROM.
Figure 1-2. TUSB8040A Functional Block Diagram
Copyright © 2012–2013, Texas Instruments Incorporated PRODUCT OVERVIEW 7
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