USB2251 datasheet(15/43 Pages) MICROCHIP

15 / 43 page

USB2250/50i/51/51i

DS00002005A-page 15

 2009 - 2015 Microchip Technology Inc.

MISC

General Purpose

Input/Output

LED

120

I/O12

LED: It can be used as an LED output.

VBUS_DET

121

I/O12

VBUS is a 3.3 volt input. A resistor divider must

be used if connecting to 5 volts of USB power.

SCL /

xD_ID

118

O12

SCL: This is the clock output when used with an

external EEPROM.

I/O12

xD_ID: This is the xD-Picture Card detection pin

only applicable to USB2250/USB2250i.

SDA

I/O12

SDA: This is the data pin when used with an

external serial EEPROM.

CRD_PWR0

I/O12

CRD_PWR: Card power drive of 3.3 V at either

100 mA or 200 mA.

I/O200

CRD_PWR1

I/O12

CRD_PWR: Card power drive of 3.3 V at either

100 mA or 200 mA.

I/O200

CRD_PWR2

I/O200

CRD_PWR: Card power drive of 3.3 V at either

100 mA or 200 mA.

Requirement: This must be the only FET used

to power SM devices. Failure to do this will

violate SM voltage specification on SM device

pins.

CRD_PWR3

I/O200

CRD_PWR: Card power drive of 3.3 V at either

100 mA or 200 mA.

Requirement: This must be the only FET used

to power SM devices. Failure to do this will

violate SM voltage specification on SM device

pins.

RESET Input

RESET_N

This active low signal is used by the system to

reset the chip. The active low pulse should be

at least 1

s wide.

TEST Input

TEST

103

Tie this pin to ground for normal operation.

Regulator Enable

REG_EN

IPU

This signal is used to enable the internal

1.8 V regulator.

DIGITAL POWER, and GROUND

1.8 V Digital Core

Power

VDD18

If the internal regulator is enabled, then this pin

must have a 1.0

F (or greater) ±20% (ESR

<0.1

) capacitor to VSS.

1.8 V PLL Power

VDD18PLL

125

If the internal regulator is enabled, then this pin

must have a 1.0

F (or greater) ±20% (ESR

<0.1

) capacitor to VSS.

3.3 V Power and

Voltage Regulator

Input

VDD33

104

128

If the internal regulator is enabled, pins 50 and

128 each require an external bypass capacitor

of 4.7

F minimum.

TABLE 5-1:

USB2250/50I/51/51I 128-PIN VTQFP PIN DESCRIPTIONS (CONTINUED)

Name

Symbol

128-Pin

VTQFP

Buffer

Type

Description

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