USB2251-NU-05 Standard Microsystems (SMSC), USB2251-NU-05 Datasheet - Page 32

• Manufacturer Part Number: USB2251-NU-05
• Description: ULTRA FAST USB 2.0 MULTI-SLOT FLASH MEDI
• Manufacturer: Standard Microsystems (SMSC)

Specifications of USB2251-NU-05

• Lead Free Status / RoHS Status: Supplier Unconfirmed

Revision 2.0 (09-29-09)
8.2.4.4
8.2.4.5
8.2.4.6
8.2.5
FET
FET
BYTE
BYTE
2
3
0
1
2
3
0
1
SM_PWR_HB
SD_PWR_HB
SD_PWR_LB
FET Hi Byte
FET Lo Byte
FET Hi Byte
A6h-A7h: Secure Digital Device Power Configuration
A8h: LED Blink Interval
A9h: LED Blink Duration
Device ID Strings
These bytes are used to specify the LUN descriptor returned by the device. These bytes are used in
combination with the device to LUN mapping bytes in applications where the OEM wishes to reorder
and rename the LUNs. If multiple devices are mapped to the same LUN (a COMBO LUN), then the
CLUN#_ID_STR will be used to name the COMBO LUN instead of the individual device strings. When
applicable, the "SM" value will be overridden with xD once an xD-Picture Card has been identified.
TYPE
TYPE
LED_BLK_DUR
LED_BLK_INT
NAME
NAME
BITS
BITS
3:0
3:0
7:4
3:0
7:4
7:4
The blink rate is programmable in 50 ms intervals. The high bit (7) indicates
an idle state:
‘0’ - Off
‘1’ - On
The remaining bits (6:0) are used to determine the blink interval up to a max
of 63 x 50 ms.
LED Blink After Access. This byte is used to designate the number of
seconds that the GPIO1 LED will continue to blink after a drive access.
Setting this byte to "05" will cause the GPIO 1 LED to blink for 5 seconds
after a drive access.
Low Nibble
High Nibble
Low Nibble
High Nibble
Low Nibble
High Nibble
BIT TYPE
BIT TYPE
DATASHEET
32
0000b Disabled
0001b External FET enabled
1000b Internal FET with 100 mA power limit
1010b Internal FET with 200 mA power limit
0000b Disabled
0000b Disabled
0000b Disabled
0001b External FET enabled
1000b Internal FET with 100 mA power limit
1010b Internal FET with 200 mA power limit
0000b Disabled
DESCRIPTION
DESCRIPTION
Ultra Fast USB 2.0 Multi-Slot Flash Media Controller
DESCRIPTION
DESCRIPTION
SMSC USB2250/50i/51/51i
Datasheet