USB97C223-NU SMSC [SMSC Corporation], USB97C223-NU Datasheet - Page 13

• Manufacturer Part Number: USB97C223-NU
• Description: Bus Powered USB 2.0 Flash Media Controller
• Manufacturer: SMSC [SMSC Corporation]

Bus Powered USB 2.0 Flash Media Controller
Datasheet
SMSC USB97C223
MS System
CLK
SD Data3-0
SD Clock
SD Command
SD Write
Protected
USB Bus Data
USB
Transceiver
Bias
Analog Test
1.8v Analog
Power
Analog Ground
Reference
3.3v Analog
Power
Analog Ground
Reference
1.8v Voltage
Regulator for
USB PHY
Crystal
Input/External
Clock Input
Crystal Output
Memory Data
Bus
NAME
SD_DAT[3:0]
MS_SCLK
SYMBOL
SD_CMD
SD_nWP
SD_CLK
MD[7:0]
ATEST
XTAL1/
RBIAS
XTAL2
VREG
CLKIN
VDDP
VDDA
USB+
VSSP
VSSA
USB-
BUFFER
OCLKx
ICLKx
TYPE
IO-U
I/O8
I/O8
IPD
IOA
IO8
O8
O8
DATASHEET
I
MEMORY/IO INTERFACE
USB INTERFACE
SD INTERFACE
This pin is an output clock signal to the MS device.
These are bi-directional data signals.
This is an output clock signal to SD/MMC device.
This is a bi-directional signal that connects to the CMD
signal of SD/MMC device.
This pin is Write Protect Switch input signal with an
internal weak pull-down.
These pins connect to the USB bus data signals.
A 12.0KΩ ± 1% resistor is attached from ground to this
pin to set the transceiver’s internal bias currents.
This signal is used for testing the analog section of the
chip and for enabling and disabling the internal 1.8 volt
regulator. This pin should be connected to VDDA to
enable the internal regulator or to VSSA to disable it.
1.8v Analog Power
If the internal 1.8V regulator is enabled, this pin MUST
have a 10uf +/- 20%, (equivalent series resistance (ESR)
<0.1ohm) bypass capacitor to VSSA. This capacitor
should be placed as close to the pin as possible.
Analog Ground Reference for 1.8v Analog power.
3.3v Analog Power
Analog Ground Reference for 3.3v Analog Power.
This pin is connected to 3.3v.
12Mhz Crystal or external clock input.
This pin can be connected to one terminal of the crystal
or can be connected to an external 12Mhz clock when a
crystal is not used.
12Mhz Crystal
This is the other terminal of the crystal, or 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.
When using external program memory, these signals are
used to transfer data between the internal CPU and the
external program memory.
When using internal program ROM, internal weak pull up
resistors are activated to prevent these pins from floating.
Page 13
DESCRIPTION
Revision 1.5 (01-06-05)