USB2524 datasheet(16/57 Pages) SMSC

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USB MultiSwitchTM Hub

Datasheet

Revision 1.2 (07-17-06)

SMSC USB2524

DATASHEET

Internal Default Configuration

4-Wire Mode = (edge triggered)

LED Mode = 8, single color

Strap options on pins LED_A[4:1]_N are enabled.

Supports unassigned Ports

Internal Default Configuration

4-Wire Mode = (edge triggered)

LED Mode = 8, Dual color

Strap options on pins LED_A[4:1]_N are disabled

Supports unassigned Ports.

110

Reserved

111

Reserved

Table 5.3 Miscellaneous Pins

NAME

SYMBOL

TYPE

FUNCTION

Crystal

Input/External

Clock Input

XTAL1/

CLKIN

ICLKx

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.

Note:

See Table 11.1 for the required logic voltage

levels of this pad if it will be driven by an

external clock source.

Crystal Output

XTAL2

OCLKx

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.

RESET Input

RESET_N

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

chip. The minimum active low pulse is 1us.

Self-Power /

Bus-Power

Detect

SELF_PWR

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.

TEST Pin

TEST

IPD

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

connect or connect to ground.

Table 5.4 Power, Ground, and No Connect

NAME

SYMBOL

TYPE

FUNCTION

VDD Core

VDDCR18

+1.8V core power.

pin 20 must have a 4.7

μF (or greater) ±20% (ESR

<0.1

Ω) capacitor to VSS

VDDIO 3.3V

VDD33

+3.3V Power Supply for the Digital I/O.

Table 5.2 SMBus or EEPROM Interface Behavior (continued)

NAME

SYMBOL

TYPE

FUNCTION

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