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USB2504A-JT

Integrated USB 2.0 Compatible 4-Port Hub

SMSC -> Microchip 

5.2.1.2

Integrated USB 2.0 Compatible 4-Port Hub

Datasheet

Pull-Up Resistor

The Circuit board designer is required to place external pull-up resistors (10KΩ recommended) on the

SDA/SMBDATA & SCL/SMBCLK/CFG_SELO lines (per SMBus 1.0 Specification, and EEPROM

manufacturer guidelines) to Vcc in order to assure proper operation.

5.2.1.3

I2C EEPROM Slave Address

Slave address is 1010000.

Note: 10-bit addressing is NOT supported.

5.2.2 In-Circuit EEPROM Programming

The EEPROM can be programmed via ATE by pulling RESET_N low (which tri-states the Hub’s

EEPROM interface and allows an external source to program the EEPROM).

5.2.3 EEPROM DATA

Table 5.1 User-Defined Descriptor Data

FIELD

BYTE

MSB:

LSB

SIZE

(BYTES)

DEFAULT

CFG

SELF

(HEX)

DEFAULT

CFG

BUS

(HEX)

DESCRIPTION

VID

1:0

PID

3:2

DID

5:4

Config Data

6

Byte 1

Config Data

7

Byte 2

Non

8

Removable

Device

Port Disable

9

Self-Powered

Port Disable

A

Bus-Powered

Max Power

B

Self-Powered

Max Power

C

Bus-Powered

Hub Controller

D

Max Current

Self-Powered

Hub Controller

E

Max Current

Bus-Powered

Power-On

F

Time

2

0424

0424

Vendor ID (assigned by USB-IF).

2

4-port =

4-Port =

Product ID (assigned by Manufacturer).

2504

2504

2

0000

0000

Device ID (assigned by Manufacturer).

1

98

1C

Configuration data byte #1 for Hub options.

1

90

90

Configuration data byte #2 for Hub options.

1

00

00

Defines the ports that contain attached

devices (this is used only when Hub is part of

a compound device).

1

00

00

Selects the ports that will be permanently

disabled

1

00

00

Selects the ports that will be permanently

disabled

1

01

01

Max Current for this configuration (expressed

in 2mA units).

1

64

64

Max Current for this configuration (expressed

in 2mA units).

1

01

01

Max Current (expressed in 2mA units).

1

64

64

Max Current (expressed in 2mA units).

1

32

32

Time until power is stable.

Revision 2.3 (08-27-07)

20

DATASHEET

SMSC USB2504/USB2504A

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