USB2240 datasheet(15/43 Pages) MICROCHIP

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DS00001979A-page 15

USB224X

MS_BS

O12

MS Bus State

This pin is connected to the bus state (BS) pin of the MS

device. It is used to control the bus states 0, 1, 2 and 3

(BS0, BS1, BS2 and BS3) of the MS device.

MS_SCLK

O12

MS System CLK

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

The clock frequency is software configurable.

MS_INS

IPU

MS Card Insertion

This is designated by the default firmware as the Memory

Stick card detection pin.

Note: This pin can be left unconnected if the socket is

not used.

SECURE DIGITAL (SD) / MULTIMEDIACARD (MMC) INTERFACE

SD_D[7:0]

I/O12PU

SD Data

The pins are bi-directional data signals SD_D0 - SD_D7

and have weak pull-up resistors.

SD_CLK

O12

SD Clock

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

The clock frequency is software configurable.

SD_CMD

I/O12PU

SD Command

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

signal of the SD/MMC device and has a weak internal

pull-up resistor.

SD_WP

SD Write Protect Detection

SD_nCD

SD Card Detect

USB INTERFACE

USB+

USB-

I/O-U

USB Bus Data

These pins connect to the USB bus data signals.

RBIAS

I-R

USB Transceiver Bias

A 12.0 k

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

pin in order to set the transceiver's internal bias currents.

XTAL1 (CLKIN)

ICLKx

24 MHz Crystal (External clock input)

This pin can be connected to one terminal of the crystal

or can be connected to an external 24 MHz clock when a

crystal is not used.

XTAL2

OCLKx

24 MHz Crystal

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

when an external clock source is used to drive

XTAL1(CLKIN).

VDDA33

3.3 V Analog Power

TABLE 6-1:

USB224X 36-PIN QFN PIN DESCRIPTIONS (CONTINUED)

Symbol

Buffer

Type

Description

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