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USB2502-AEZG

2-Port USB 2.0 Hub Controller

SMSC -> Microchip 

2-Port USB 2.0 Hub Controller

Datasheet

Chapter 4 2-Port Hub Block Diagram

8SVWUHDP

VBUS

Upstream

USB Data

24 MHz

Crystal

3.3V

Bus-Power Upstream

'HWHFW

PHY

PLL

1.8V Reg

Repeater

SIE

To EEPROM or

SMBus Master

1.8V

SD SCK

Serial

Interface

Controller

Transaction Translator

Port

Controller

Routing Logic

Downstream PHY #1

OC Sense

Switch Driver

LED Driver

Strapping Options

Downstream PHY #2

Downstream

USB Data

OC

Sense

Switch/LED

Driver/optís

Downstream

USB Data

Figure 4.1 2-Port Block Diagram

NAME

USB Bus Data

Detect Upstream

VBUS Power

Table 4.1 2-Port Hub Pin Descriptions

SYMBOL

TYPE

FUNCTION

USBDN0

USBDP0

VBUS_DET

UPSTREAM USB 2.0 INTERFACE

IO-U

These pins connect to the upstream USB bus data signals.

I/O8

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).

SMSC USB2502

11

DATASHEET

Revision 2.3 (08-27-07)

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