USB2224 datasheet(12/20 Pages) SMSC

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Bus Powered USB2.0 Flash Media Controller

Datasheet

Revision 1.3 (06-13-06)

Page 12

SMSC USB2224

DATASHEET

NAME

SYMBOL

BUFFER

TYPE

DESCRIPTION

MS System

CLK

MS_SCLK

This pin is an output clock signal to the MS device.

SD INTERFACE

SD Data3-0

SD_DAT[3:0]

I/O8

These are bi-directional data signals.

SD Clock

SD_CLK

This is an output clock signal to SD/MMC device.

SD Command

SD_CMD

I/O8

This is a bi-directional signal that connects to the CMD

signal of SD/MMC device.

SD Write

Protected

SD_nWP

IPD

This pin is Write Protect Switch input signal with an

internal weak pull-down.

USB INTERFACE

USB Bus Data

USB-

USB+

IO-U

These pins connect to the USB bus data signals.

USB

Transceiver

Bias

RBIAS

A 12.0K

Ω ± 1% resistor is attached from ground to this

pin to set the transceiver’s internal bias currents.

Analog Test

ATEST

IOA

This signal is used for testing the analog section of the

chip and should be connected to VDDA for normal

operation.

1.8v Analog

Power

VDDP

1.8v Analog Power

This pin MUST have a 10uf +/- 20%, (equivalent series

resistance (ESR) <0.1ohm) bypass capacitor to VSSA.

This capacitor should be placed as close to the pin as

possible.

Analog Ground

Reference

VSSP

Analog Ground Reference for 1.8v Analog power.

3.3v Analog

Power

VDDA

3.3v Analog Power

Analog Ground

Reference

VSSA

Analog Ground Reference for 3.3v Analog Power.

1.8v Voltage

Regulator for

USB PHY

VREG

This pin is connected to 3.3v.

Crystal

Input/External

Clock Input

XTAL1/

CLKIN

ICLKx

12Mhz Crystal or external clock input.

This pin can be connected to one terminal of the crystal

or can be connected to an external 12Mhz clock when a

crystal is not used.

Crystal Output

XTAL2

OCLKx

12Mhz Crystal

This is the other terminal of the crystal, or left open when

an external clock source is used to drive XTAL1/CLKIN.

It may not be used to drive any external circuitry other

than the crystal circuit.

MEMORY/IO INTERFACE

Memory Data

Bus

MD[7:0]

IO8

When using external program memory, these signals are

used to transfer data between the internal CPU and the

external program memory.

When using internal program ROM, internal weak pull up

resistors are activated to prevent these pins from floating.

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