USB2227 datasheet(10/25 Pages) MICROCHIP

10 / 25 page

USB2227/USB2228

DS00002256A-page 10

 2007-2016 Microchip Technology Inc.

MS_D[3:2]

I/O8PD

MS System Data In/Out:

This pin is a bi-directional data signal for the MS device.

The bi-directional data signal has an internal weak pull-down

resistor.

MS_INS

IPU

MS Card Insertion:

This pin is the card detection signal from the MS device to

indicate, if the device is inserted.

This pin has an internally controlled weak pull-up resistor.

MS_SCLK

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]

I/O8PU

SD Data 3-0:

These are bi-directional data signals.

These pins have internally controlled weak pull-up resistors.

SD_CLK

SD Clock:

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

The clock frequency is software configurable.

SD_CMD

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

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

IO-U

USB Bus Data:

These pins connect to the USB bus data signals.

RBIAS

USB Transceiver Bias:

A 12.0k

,  1.0% resistor is attached from VSSA to this pin, in

order to set the transceiver’s internal bias currents.

ATEST

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

1.8v Power for the PLL

VSSPLL

104

PLL Ground Reference:

Ground Reference for 1.8v PLL power

VDDA33

3.3v Analog Power

VSSA

Analog Ground Reference:

Analog Ground Reference for 3.3v Analog Power.

Symbol

128-Pin

VTQFP

Buffer Type

Description

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