USB2504 datasheet(8/42 Pages) MICROCHIP

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USB2504/USB2504A

DS000002250A-page 8

 2007 - 2016 Microchip Technology Inc.

4-PORT USB 2.0 HUB INTERFACE

High-Speed USB

Data

USBDN[4:1]

USBDP[4:1]

IO-U

These pins connect to the downstream USB peripheral

devices attached to the Hub’s ports.

USB Power Enable

PRTPWR[4:1]

O12

Enables power to USB peripheral devices (downstream).

The active signal level of the PRTPWR[4:1] pins is

determined by the Power Polarity Strapping function of the

PRTPWR_POL pin.

Port 4:3 Green

LED

Port Disable

strapping option.

GR[4:3]/

PRT_DIS[1:0]

I/O12

Green indicator LED for ports 4 and 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 ports [4:2] will be permanently disabled. Also, the

active state of the LED’s will be determined as follows:

PRT_DIS[1:0] = ‘00’, All ports are enabled,

GR4 is active high,

GR3 is active high.

PRT_DIS[1:0] = ‘01’, Port 4 is disabled,

GR4 is active high,

GR3 is active low.

PRT_DIS[1:0] = ‘10’, Ports 4 & 3 are disabled,

GR4 is active low,

GR3 is active high.

PRT_DIS[1:0] = ‘11’, Ports 4, 3 & 2 are disabled,

GR4 is active low,

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_REM[1:0] = ‘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.

Port 4 Amber LED

LED Enable

strapping option

AM4/

LED_EN

I/O12

Amber indicator LED for port 4. Will be active low when LED

support is enabled via EEPROM or SMBus.

If the hub is configured by the internal default configuration,

this pin will be sampled at RESET_N negation to determine

if LED support is enabled or disabled. Also, the active state

of the LED will be determined as follows:

‘0’ = LED support is disabled, LED is inactive

‘1’ = LED Support is enabled, LED is active low.

TABLE 4-1:

4-PORT HUB PIN DESCRIPTIONS (CONTINUED)

Name

Symbol

Type

Function

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