USB2244 Standard Microsystems Corp., USB2244 Datasheet - Page 11

• Manufacturer Part Number: USB2244
• Description: Usb2244/usb2244i Ultra Fast Usb 2.0 Sd/mmc Flash Media Controller
• Manufacturer: Standard Microsystems Corp.

Ultra Fast USB 2.0 SD/MMC Flash Media Controller
Datasheet
SMSC USB2244/USB2244i
24MHz Crystal
or external clock
input
24MHz Crystal
3.3V Analog
Power
1.8V PLL Power
General Purpose
I/O
General Purpose
I/O
General Purpose
I/O
General Purpose
I/O
General Purpose
I/O
General Purpose
I/O
RESET Input
NAME
Table 5.2 USB2244/2244i 36-Pin QFN Pin Descriptions (continued)
XTAL1
(CLKIN)
XTAL2
VDDA33
VDD18PLL
GPIO1 (LED1)
GPIO2 / RXD /
SDA
GPIO4
GPIO7 /
TXD /
SCK
GPIO10
(CRD_PWR)
GPIO14
nRESET
SYMBOL
36-PIN
QFN
33
32
36
34
27
29
31
21
19
18
1
DATASHEET
ICLKx
OCLKx
I/O12
I/O12
I
I/O12
I/O12
I/O12
O12
O12
I/O200
I/O12
IS
BUFFER
MISC
TYPE
11
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.
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
This pin is the 1.8V Power for the PLL.
+1.8V Filtered analog power for internal PLL.
This pin must have a 1.0
(ESR <0.1Ω) capacitor to VSS.
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.
GPIO: This pin may be used either as input,
edge sensitive interrupt input, or output.
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".
SDA: This is the data pin when used with an
external serial EEPROM.
This pin may be used either as input, edge
sensitive interrupt input, or output.
GPIO: This pin may be used either as input,
edge sensitive interrupt input, or output.
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"
SCK: This is the clock output when used with
an external EEPROM.
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.
This pin may be used either as input, edge
sensitive interrupt input, or output.
This active low signal is used by the system to
reset the chip. The active low pulse should be
at least 1μs wide.
DESCRIPTION
μ
F(or greater) ±20%
Revision 1.0 (05-27-08)