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USB2502

2-Port USB 2.0 Hub Controller

SMSC -> Microchip 

2-Port USB 2.0 Hub Controller

Datasheet

Table 4.1 2-Port Hub Pin Descriptions (continued)

NAME

SYMBOL

TYPE

FUNCTION

Serial Data/SMB

Data

Serial Clock/SMB

Clock

&

Config Select 0

Configuration

Programming

Select

SDA/SMBDATA

SCL/SMBCLK/

CFG_SEL0

CFG_SEL1

SERIAL PORT INTERFACE

IOSD12 (Serial Data)/(SMB Data) signal.

IOSD12

I

(Serial Clock)/(SMB Clock) signal. This multifunction pin is

read on the rising edge of RESET_N (see the applicable

RESET_N timing table in Section 5.6.1) and will determine

the hub configuration method as described in Table 4.2.

This pin is read on the rising edge of RESET_N (see the

applicable RESET_N timing table in Section 5.6.1) and will

determine the hub configuration method as described in

Table 4.2.

Table 4.2 SMBus or EEPROM Interface Behavior

CFG_SEL1

0

0

1

1

CFG_SEL0

0

1

0

1

SMBus or EEPROM interface behavior.

Reserved

Configured as an SMBus slave for external download of user-

defined descriptors. SMBus slave address is 0101100

Internal Default Configuration via strapping options.

2-wire (I2C) EEPROMS are supported,

NAME

Crystal

Input/External

Clock Input

Crystal Output

SYMBOL

XTAL1/

CLKIN

XTAL2

Clock Input

Enable

CLKIN_EN

RESET Input

Self-Power /

Bus-Power

Detect

TEST Pin

RESET_N

SELF_PWR

TEST

SMSC USB2502

Table 4.3 Miscellaneous Pins

TYPE

ICLKx

OCLKx

I

IS

I

IPD

FUNCTION

24MHz crystal or external clock input.

This pin connects to either one terminal of the crystal or

to an external 24MHz clock when a crystal is not used.

24MHz Crystal

This is the other terminal of the crystal, or left

unconnected when an external clock source is used to

drive XTAL1/CLKIN. It must not be used to drive any

external circuitry other than the crystal circuit.

Clock In Enable:

Low = XTAL1 and XTAL2 pins configured for use with

external crystal

High = XTAL1 pin configured as CLKIN, and must be

driven by an external CMOS clock.

This active low signal is used by the system to reset the

chip. The minimum active low pulse is 1us.

Detects availability of local self-power source.

Low = Self/local power source is NOT available (i.e., Hub

gets all power from Upstream USB VBus).

High = Self/local power source is available.

Used for testing the chip. User must treat as a no-

connect or connect to ground.

13

DATASHEET

Revision 2.3 (08-27-07)

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