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On Board 24Mhz Crystal Driver Circuit
Can be clocked by 48MHz external source
On-Chip 1.8V Regulator for Low Power Core
Operation
Internal PLL for 480Mhz USB2.0 Sampling,
Configurable MCU clock
Supports firmware upgrade via USB bus if 鈥渂oot
block鈥?Flash program memory is used
15 GPIOs for special function use: LED indicators,
button inputs, power control to memory devices, etc.
鈥?Inputs capable of generating interrupts with either edge
sensitivity
鈥?Attribute bit controlled features:
鈥?Activity LED polarity/operation/blink rate
鈥?Full or Partial Card compliance checking
鈥?Bus or Self Powered
鈥?LUN configuration and assignment
鈥?Write Protect Polarity
鈥?SmartDetach鈩?Detach from USB when no Card
Inserted for Notebook apps
鈥?Cover Switch operation for xD compliance
鈥?Inquiry Command operation
鈥?SD Write Protect operation
鈥?Older CF card support
鈥?Force USB 1.1 reporting
鈥?Internal or External Power FET operation
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8051 8 bit microprocessor
鈥?Provides low speed control functions
鈥?30 Mhz execution speed at 4 cycles per instruction
average
鈥?12K Bytes of internal SRAM for general purpose
scratchpad
鈥?768 Bytes of internal SRAM for general purpose
scratchpad or program execution while re-flashing
external ROM
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Compatible with Microsoft WinXP, WinME, Win2K
SP3, Apple OS10, Softconnex, and Linux Multi-LUN
Mass Storage Class Drivers
Win2K, Win98/98SE and Apple OS8.6 and OS9
Multi-LUN Mass Storage Class Drivers available from
SMSC
128 Pin VTQFP Package (1.0mm height, 14mm
x14mm footprint); green, lead-free package also
available
1.xD Picture Card not applicable to USB2227.
SMSC USB2227/USB2228
DATASHEET
Revision 1.77 (06-13-05)
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