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Ultra Fast USB 2.0 SD/MMC Flash Media Controller

Datasheet

SMSC USB2244/USB2244i 11 Revision 1.0 (05-27-08)

DATASHEET

24MHz Crystal

or external clock

input

XTAL1

(CLKIN)

33 ICLKx This pin can be connected to one terminal of

the crystal or it can be connected to an external

24 clock when a crystal is not used.

24MHz Crystal XTAL2 32 OCLKx This is the other terminal of the crystal, or it can

be 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.

3.3V Analog

Power

VDDA33 36 3.3V Analog Power

1.8V PLL Power VDD18PLL 34 This pin is the 1.8V Power for the PLL.

+1.8V Filtered analog power for internal PLL.

This pin must have a 1.0μF(or greater) ±20%

(ESR <0.1Ω) capacitor to VSS.

MISC

General Purpose

I/O

GPIO1 (LED1) 1 I/O12 This pin may be used either as input, edge

sensitive interrupt input, or output.

In addition, as an output, the GPIO1 can use

output controlled by the LED1_GPIO1 register.

General Purpose

I/O

GPIO2 / RXD /

SDA

27 I/O12 GPIO: This pin may be used either as input,

edge sensitive interrupt input, or output.

I RXD: In addition to the above, the signal can

be used as input to the RXD of UART in the

device, when the TXD_RXD_SEL bit in

UTIL_CONFIG1 register is cleared to "0".

I/O12 SDA: This is the data pin when used with an

external serial EEPROM.

General Purpose

I/O

GPIO4 29 I/O12 This pin may be used either as input, edge

sensitive interrupt input, or output.

General Purpose

I/O

GPIO7 /

TXD /

SCK

31 I/O12 GPIO: This pin may be used either as input,

edge sensitive interrupt input, or output.

O12 TXD: In addition, as an output, the GPIO7 can

be used as an output TXD of UART in the

device, when the GPIO2/TXD bit in

UTL_CONFIG register is set to "1"

O12 SCK: This is the clock output when used with

an external EEPROM.

General Purpose

I/O

GPIO10

(CRD_PWR)

21 I/O200 GPIO: This pin may be used either as input,

edge sensitive interrupt input, or output.

CRD_PWR: Card Power drive of 3.3V @ either

100mA or 200mA.

General Purpose

I/O

GPIO14 19 I/O12 This pin may be used either as input, edge

sensitive interrupt input, or output.

RESET Input nRESET 18 IS This active low signal is used by the system to

reset the chip. The active low pulse should be

at least 1μs wide.

Table 5.2 USB2244/2244i 36-Pin QFN Pin Descriptions (continued)

NAME SYMBOL

36-PIN

QFN

BUFFER

TYPE DESCRIPTION

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 21 22

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