Integrated USB 2.0 Compatible 3-Port Hub

 

 

 

Datasheet

 

Table 4.1 3-Port Hub Pin Descriptions (continued)

 

 

 

 

NAME

SYMBOL

TYPE

FUNCTION

 

 

 

 

 

 

3-PORT USB 2.0 HUB INTERFACE

 

 

 

 

High-Speed USB

USBDN[3:1]

IO-U

These pins connect to the downstream USB peripheral

Data

USBDP[3:1]

 

devices attached to the Hub’s ports.

 

 

 

 

USB Power

PRTPWR[3:1]

O12

Enables power to USB peripheral devices (downstream).

Enable

 

 

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

GR3/

I/O12

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

&

PRT_DIS0

 

support is enabled via EEPROM or SMBus.

Port Disable

 

 

If the hub is configured by the internal default configuration,

strapping option.

 

 

 

 

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

GR[2:1]/

I/O12

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

LED

NON_REM[1:0]

 

when LED support is enabled via EEPROM or SMBus.

&

 

 

If the hub is configured by the internal default configuration,

Port Non-

 

 

 

 

these pins will be sampled at RESET_N negation to

Removable

 

 

 

 

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

strapping option.

 

 

 

 

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

GANG_EN

I/O12

If the hub is configured by the internal default configuration,

Switching and

 

 

this pin will be sampled at RESET_N negation to determine

Current Sensing

 

 

if downstream port power switching and current sensing are

strapping option.

 

 

ganged, or individual port-by-port.

 

 

 

 

 

 

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

 

 

 

‘1’ = Ganged sensing & switching.

 

 

 

 

Revision 2.3 (08-27-07)

10

SMSC USB2503/USB2503A

 

DATASHEET