USB2228 SMSC Corporation, USB2228 Datasheet - Page 15

• Manufacturer Part Number: USB2228
• Description: (USB2227 / USB2228) 4th Generation USB2.0 Flash Media Controller
• Manufacturer: SMSC Corporation

4th Generation USB2.0 Flash Media Controller with Integrated Card Power FETs
Datasheet
SMSC USB2227/USB2228
SD_DAT[3:0]
VDD18PLL
MS_SCLK
SYMBOL
SD_CMD
SD_nWP
SD_CLK
VSSPLL
VDDA33
USBDM
USBDP
ATEST
RBIAS
VSSA
128-PIN
VTQFP
101
104
23
29
28
27
26
31
30
25
87
88
98
99
89
86
124-PIN
DQFN
B11
A15
B13
A14
B12
A16
B14
A13
A44
B41
A49
B47
B48
A52
A45
A43
BUFFER
I/O8PU
I/O8PU
TYPE
IO-U
AIO
IPD
O8
O8
USB INTERFACE
DATASHEET
SD INTERFACE
I
15
MS System CLK:
This pin is an output clock signal to the MS device.
The clock frequency is software configurable.
SD Data 3-0:
These are bi-directional data signals.
These pins have internally controlled weak pull-up
resistors.
SD Clock:
This is an output clock signal to SD/MMC device.
The clock frequency is software configurable.
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 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 Bus Data:
These pins connect to the USB bus data signals.
USB Transceiver Bias:
A 12.0kΩ, ± 1.0% resistor is attached from VSSA to this
pin, in order to set the transceiver’s internal bias
currents.
Analog Test:
This signal is used for testing the analog section of the
chip and should be connected to VDDA33 for normal
operation.
1.8v Power for the PLL
PLL Ground Reference:
Ground Reference for 1.8v PLL power
3.3v Analog Power
Analog Ground Reference:
Analog Ground Reference for 3.3v Analog Power.
DESCRIPTION
Revision 1.91 (10-13-06)