USB2502 SMSC Corporation, USB2502 Datasheet - Page 11

• Manufacturer Part Number: USB2502
• Description: 2-Port USB 2.0 Hub Controller
• Manufacturer: SMSC Corporation

2-Port USB 2.0 Hub Controller
Datasheet
Chapter 4 2-Port Hub Block Diagram
SMSC USB2502
Detect Upstream
USB Bus Data
VBUS Power
NAME
VBUS_DET
SYMBOL
USBDN0
USBDP0
Downstream PHY #1
Bus-Power
V
Downstream
USB Data
BUS
Table 4.1 2-Port Hub Pin Descriptions
UPSTREAM USB 2.0 INTERFACE
Figure 4.1 2-Port Block Diagram
Upstream
Repeater
TYPE
IO-U
USB Data
I/O8
Upstream
PHY
Sense
DATASHEET
Routing Logic
OC
Strapping Options
Transaction Translator
Switch Driver
3.3V
LED Driver
OC Sense
These pins connect to the upstream USB bus data signals.
Detects state of Upstream VBUS power. The SMSC Hub
monitors VBUS_DET to determine when to assert the
internal D+ pull-up resistor (signalling a connect event).
When designing a detachable hub, this pin must be
connected to the VBUS power pin of the USB port that is
upstream of the hub. (Use of a weak pull-down resistor is
recommended.)
For self-powered applications with a permanently attached
host, this pin must be pulled-up to either 3.3V or 5.0V
(typically VDD33).
11
1.8V Reg
Switch/LED
24 MHz
Driver/optís
Crystal
PLL
SIE
Downstream PHY #2
1.8V
Downstream
USB Data
To EEPROM or
SMBus Master
Controller
Controller
Interface
Serial
Port
SD
FUNCTION
SCK
Revision 2.1 (12-06-06)