USB2502-HT datasheet(8/40 Pages) MICROCHIP

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USB2502

DS000002248A-page 8

 2007 - 2016 Microchip Technology Inc.

4.0

2-PORT HUB BLOCK DIAGRAM

FIGURE 4-1:

2-PORT BLOCK DIAGRAM

TABLE 4-1:

2-PORT HUB PIN DESCRIPTIONS

Name

Symbol

Type

Function

UPSTREAM USB 2.0 INTERFACE

USB Bus Data

USBDN0

USBDP0

IO-U

These pins connect to the upstream USB bus data signals.

Detect Upstream

VBUS Power

VBUS_DET

I/O8

Detects state of Upstream VBUS power. The Microchip Hub

monitors VBUS_DET to determine when to assert the internal

D+ pull-up resistor (signaling 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).

Upstream

BUS

3.3V

Upstream

PHY

Upstream

USB Data

Repeater

Controller

SIE

Serial

Interface

PLL

24 MHz

Crystal

To EEPROM or

SMBus Master

Routing Logic

SCK

Port

Controller

Downstream PHY #1

OC Sense

Switch Driver

LED Driver

Strapping Options

Downstream PHY #2

Downstream

USB Data

Sense

Switch/LED

Driver/optís

Downstream

USB Data

Bus-Power

Detect

1.8V

Transaction Translator

1.8V Reg

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