SMSC USB2507 Chapter 4 7-PortHub Block Diagram

Integrated USB 2.0 Compatible 7-Port Hub

Datasheet

Chapter 4 7-Port Hub Block Diagram

To

Pin

EEPROM

Upstream Upstream 24 MHz

1.8V

or SMBus

3.3V

Strapping

USB Data

VBUS

Crystal

Cap

Options

Master

SD SCL

VBUS

PLL

1.8V

Internal

Serial

Defaults

Upstream

Power

Reg.

Select

Interface

Detect

PHY

SIE

Controller

Repeater

TT

TT

...

TT

Port

#1

#2

#7

Controller

Routing Logic

...

Port #1

Port #7

Downstream

OC Sense

Downstream

OC Sense

PHY #1

Switch Driver

PHY #7

Switch Driver

LED Drivers

LED Drivers

Downstream

Switch/LED

Downstream

Switch/LED

OC

OC

USB Data

Sense

Drivers

USB Data

Sense

Drivers

Figure 4.1 7-Port Block Diagram

Table 4.1 7-Port Hub Pin Descriptions

NAME

SYMBOL

TYPE

FUNCTION

UPSTREAM USB 2.0 INTERFACE

USB Bus Data

USBDN0

IO-U

These pins connect to the upstream USB bus data signals.

USBDP0

Detect Upstream

VBUS_DET

I/O12

Detects state of Upstream VBUS power. The SMSC Hub

VBUS Power

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 USB2507	9	Revision 2.3 (08-27-07)
	DATASHEET