USB2227 datasheet(15/27 Pages) SMSC

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4th Generation USB2.0 Flash Media Controller with Integrated Card Power FETs

Datasheet

SMSC USB2227/USB2228

Revision 1.91 (10-13-06)

DATASHEET

MS_SCLK

B11

MS System CLK:

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

The clock frequency is software configurable.

SD INTERFACE

SD_DAT[3:0]

A15

B13

A14

B12

I/O8PU

SD Data 3-0:

These are bi-directional data signals.

These pins have internally controlled weak pull-up

resistors.

SD_CLK

A16

SD Clock:

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

The clock frequency is software configurable.

SD_CMD

B14

I/O8PU

SD Command:

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

signal of SD/MMC device.

This pin has an internally controlled weak pull-up

resistor.

SD_nWP

A13

IPD

SD Write Protected:

This pin is an input signal with an internal weak pull-

down.

This pin has an internally controlled weak pull-down

resistor.

USB INTERFACE

USBDM

USBDP

A44

B41

IO-U

USB Bus Data:

These pins connect to the USB bus data signals.

RBIAS

A49

USB Transceiver Bias:

A 12.0k

Ω, ± 1.0% resistor is attached from VSSA to this

pin, in order to set the transceiver’s internal bias

currents.

ATEST

B47

AIO

Analog Test:

This signal is used for testing the analog section of the

chip and should be connected to VDDA33 for normal

operation.

VDD18PLL

101

B48

1.8v Power for the PLL

VSSPLL

104

A52

PLL Ground Reference:

Ground Reference for 1.8v PLL power

VDDA33

A45

3.3v Analog Power

VSSA

A43

Analog Ground Reference:

Analog Ground Reference for 3.3v Analog Power.

SYMBOL

128-PIN

VTQFP

124-PIN

DQFN

BUFFER

TYPE

DESCRIPTION

USB2227 Datasheet(PDF) 15 Page - SMSC Corporation

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