USB2503A datasheet(10/43 Pages) SMSC

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Integrated USB 2.0 Compatible 3-Port Hub

Datasheet

Revision 2.3 (08-27-07)

SMSC USB2503/USB2503A

DATASHEET

3-PORT USB 2.0 HUB INTERFACE

High-Speed USB

Data

USBDN[3:1]

USBDP[3:1]

IO-U

These pins connect to the downstream USB peripheral

devices attached to the Hub’s ports.

USB Power

Enable

PRTPWR[3:1]

O12

Enables power to USB peripheral devices (downstream).

The active signal level of the PRTPWR[3:1] pins are

determined by the Power Polarity Strapping function of the

PRTPWR_POL pin.

Port 3 Green LED

Port Disable

strapping option.

GR3/

PRT_DIS0

I/O12

Green indicator LED for port 3. Will be active low when LED

support is enabled via EEPROM or SMBus.

If the hub is configured by the internal default configuration,

these pins will be sampled at RESET_N negation to

determine if port 3 will be permanently disabled. Also, the

active state of the LED will be determined as follows:

PRT_DIS0 = ‘0’, All ports are enabled,

GR3 is active high.

PRT_DIS0 = ‘1’, Port 3 is disabled,

GR3 is active low.

Port [2:1] Green

LED

Port Non-

Removable

strapping option.

GR[2:1]/

NON_REM[1:0]

I/O12

Green indicator LED for ports 2 and 1. Will be active low

when LED support is enabled via EEPROM or SMBus.

If the hub is configured by the internal default configuration,

these pins will be sampled at RESET_N negation to

determine if ports [3:1] contain permanently attached (non-

removable) devices. Also, the active state of the LED’s will

be determined as follows:

NON_REM[1:0] = ‘00’, All ports are removable,

GR2 is active high,

GR1 is active high.

NON_REM1:0] = ‘01’, Port 1 is non-removable,

GR2 is active high,

GR1 is active low.

NON_REM[1:0] = ‘10’, Ports 1 & 2 are non-removable,

GR2 is active low,

GR1 is active high.

NON_REM[1:0] = ‘11’, Ports 1, 2, & 3 are non-removable,

GR2 is active low,

GR1 is active low.

Gang Power

Switching and

Current Sensing

strapping option.

GANG_EN

I/O12

If the hub is configured by the internal default configuration,

this pin will be sampled at RESET_N negation to determine

if downstream port power switching and current sensing are

ganged, or individual port-by-port.

‘0’ = Port-by-port sensing & switching.

‘1’ = Ganged sensing & switching.

Table 4.1 3-Port Hub Pin Descriptions (continued)

NAME

SYMBOL

TYPE

FUNCTION

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