USB2507_07 datasheet(11/44 Pages) SMSC

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Integrated USB 2.0 Compatible 7-Port Hub

Datasheet

SMSC USB2507

Revision 2.3 (08-27-07)

DATASHEET

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.

Port 3 Amber

LED

AM3

I/O12

Amber indicator LED for port 3. Signal will be active low.

Port 2 Amber

LED

MTT Disable

AM2/

MTT_EN

I/O12

Amber indicator LED for port 2. 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 MTT support is disabled (STT only). Also, the active state

of the LED will be determined as follows:

‘0’ = MTT support is disabled, LED is active high

‘1’ = MTT support is enabled, LED is active low.

Port 1 Amber

LED

Gang Power

Switching and

Current Sensing

strapping option.

AM1/

GANG_EN

I/O12

Amber indicator LED for port 1, 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 downstream port power switching and current sensing are

ganged, or individual port-by-port. Also, the active state of

the LED will be determined as follows:

‘0’ = Port-by-port sensing & switching, LED is active high

‘1’ = Ganged sensing & switching, LED is active low.

Port Power

Polarity strapping.

PRTPWR_POL

I/O12

Port Power Polarity strapping determination for the active

signal polarity of the 7:1PRTPWR pins.

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 7:1PRTPWR pins 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 PRTPWR7:1 pin.

‘1’ = PRTPWR7:1 pins have an active ‘high’ polarity

‘0’ = PRTPWR7:1 pins have an active ‘low’ polarity

Over Current

Sense

OCS7:1_N

IPU

Input from external current monitor indicating an over-

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

supply}

USB Transceiver

Bias

RBIAS

I-R

A 12.0k

Ω (+/− 1%) resistor is attached from ground to this

pin to set the transceiver’s internal bias settings.

Table 4.1 7-Port Hub Pin Descriptions (continued)

NAME

SYMBOL

TYPE

FUNCTION

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