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USB2502-AEZG

2-Port USB 2.0 Hub Controller

SMSC -> Microchip 

Table 4.1 2-Port Hub Pin Descriptions (continued)

2-Port USB 2.0 Hub Controller

Datasheet

NAME

SYMBOL

TYPE

FUNCTION

2-PORT USB 2.0 HUB INTERFACE

High-Speed USB

Data

USBDN[2:1]

USBDP[2:1]

IO-U

These pins connect to the downstream USB peripheral

devices attached to the Hub’s ports.

USB Power

Enable

PRTPWR

O8

Enables power to USB peripheral devices (downstream).

The active signal level of the PRTPWR pin is determined by

the Power Polarity Strapping function of the PRTPWR_POL

pin.

Port [2:1] Green

GR[2:1]/

I/O8

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.

&

Port Non-

Removable

strapping option.

If the hub is configured by the internal default configuration,

these pins will be sampled at the rising edge of RESET_N

(see the applicable RESET_N timing table in Section 5.6.1)

to determine if ports [2:1] 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 are non-removable,

GR2 is active low,

GR1 is active low.

Port Power

PRTPWR_POL

I/O8

Port Power Polarity strapping determination for the active

Polarity strapping.

signal polarity of the PRTPWR pin.

While RESET_N is asserted, the logic state of this pin will

(though the use of internal combinatorial logic) determine

the active state of the PRTPWR pin in order to ensure that

downstream port power is not inadvertently enabled to

inactive ports during a hardware reset.

On the rising edge of RESET_N (see the applicable

RESET_N timing table in Section 5.6.1), the logic value will

be latched internally, and will retain the active signal polarity

for the PRTPWR pin.

‘1’ = PRTPWR pin has an active ‘high’ polarity

‘0’ = PRTPWR pin has an active ‘low’ polarity

Over Current

Sense

USB Transceiver

Bias

OCS_N

RBIAS

IPU

Input from external current monitor indicating an over-

current condition. {Note: Contains internal pull-up to 3.3V

supply}

I-R

A 12.0kΩ (+/− 1%) resistor is attached from ground to this

pin to set the transceiver’s internal bias settings.

Revision 2.3 (08-27-07)

12

DATASHEET

SMSC USB2502

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