Integrated USB 2.0 Compatible 3-Port Hub
Datasheet
Chapter 4 3-Port Hub Block Diagram
Upstream Upstream 24 MHz
USB Data
V
BUS
Crystal
3.3V
To
EEPROM
Pin
1.8V Strapping or SMBus
Master
Cap Options
SD SCL
Upstream
PHY
V
BUS
Power
Detect
PLL
1.8V
Reg.
Internal
Defaults
Select
Serial
Interface
Repeater
SIE
Controller
TT
#1
TT
#2
TT
#3
Port
Controller
Routing Logic
Port #1
Downstream
OC Sense
PHY #1
Switch Driver
LED Drivers
...
Port #3
Downstream
OC Sense
PHY #3
Switch Driver
LED Drivers
Downstream OC Switch/LED
USB Data Sense Drivers
Downstream
USB Data
OC Switch/LED
Sense Drivers
Figure 4.1 3-Port Block Diagram
Table 4.1 3-Port Hub Pin Descriptions
NAME
SYMBOL
TYPE
UPSTREAM USB 2.0 INTERFACE
FUNCTION
USB Bus Data
Detect Upstream
VBUS Power
USBDN0
USBDP0
VBUS_DET
IO-U
I/O12
These pins connect to the USB bus data signals.
Detects state of Upstream VBUS power (indicates the
power-managed state of the upstream device).
SMSC USB2503/USB2503A
DATASHEET
9
Revision 2.1 (12-06-06)
SMSC [ SMSC CORPORATION ]
