LP55281RLEV National Semiconductor, LP55281RLEV Datasheet - Page 3

• Manufacturer Part Number: LP55281RLEV
• Description: BOARD EVAL FOR LP5528 RGB DRIVER
• Manufacturer: National Semiconductor
• Series: PowerWise®r

Specifications of LP55281RLEV

• Current - Output / Channel: 400mA
• Outputs And Type: 12, Non-Isolated
• Voltage - Output: 5.3V
• Features: USB Interface
• Voltage - Input: 2.7 ~ 5.5V
• Utilized Ic / Part: LP55281
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

COMMON TAB
The Common Tab contains evaluation board control func-
tions. Automatic writing (Update registers immediately) is
enabled by default. It means that a write operation is done
after every mouse click. If you want to change several settings
in one or more tabs and write the register(s) after making all
the changes, you can disable automatic writing. Then after
the changes you have to initiate the register write by clicking
the right mouse key with the cursor in the Register Map area.
From the pop-up menu you can choose to write all registers
or just a selected register. The same pop-up lets you write
default values to one or all registers and read one or all reg-
isters.
Interface can be selected between I
are two addresses available, 0x4C and 0x4D. Interface port
is always USB.
The regulated voltage supplied from the USB board can be
set to 3.0 or 3.9V. The raw voltage from the USB port is 5V
2
C and SPI. For I
Figure 3. LP55281 Common Tab
2
C there
3
and maximum current is 500mA. By changing jumper J1 on
the USB board to 5V position the raw voltage is connected
to the evaluation board and power from USB board can be
maximally used for LEDs.
USB board can measure voltages from the evaluation board.
On the LP55281 board the circuit V
output voltage V
the USB board to the evaluation board is measured. Mea-
surement is enabled, when the Polling interval in the Common
tab is set. Measurement results are shown on top of the win-
dow.
Device can be reset by hard reset or by soft reset. Soft reset
writes to register 0x60.
By checking the debug mode you can write or read data di-
rectly to or from addresses given in Direct Access field.
BOOST
are measured. The current supplied by
DDIO
and the converter
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