LP3944ISQEV National Semiconductor, LP3944ISQEV Datasheet - Page 3

• Manufacturer Part Number: LP3944ISQEV
• Description: BOARD EVALUATION LP3944ISQ
• Manufacturer: National Semiconductor
• Series: PowerWise®r

Specifications of LP3944ISQEV

• Current - Output / Channel: 25mA
• Outputs And Type: 8, Non-Isolated
• Features: Dimmable, I²C Interface
• Voltage - Input: 2.3 ~ 5.5 V
• Utilized Ic / Part: LP3944
• Core Chip: LP3944
• No. Of Outputs: 8
• Output Current: 25mA
• Dimming Control Type: I2C
• Kit Contents: Board, User Guide
• Development Tool Type: Hardware - Eval/Demo Board
• Lead Free Status / RoHS Status: Not applicable / Not applicable
• Voltage - Output: -

The Control Panel
Demo1 — Music demo. Soundcard needed to activate the
button to play. The LEDs are controlled by the amplitude of
the music.
Demo2 — Music demo. Soundcard is needed to activate the
buttons to play. The LEDs will light up in circle as music
progresses.
Demo3 — Non-music demo to illustrate dimming effect of
LEDs.
Flash — The RGB LED will all turn on to create a flashlight
effect.
Auto Write On/Off — When auto write feature is on (the box
is checked), any change will take place immediately. If auto
Bill Of Material for LP3944
C1, C3, C4, C5, C6, C7 0.1 µF, ceramic
C2, C8
R0, R1, R4, R6, R7
R2
R3
RSCL, RSDA
RA0, RA1, RA2
K1
D1, D2
JP1
LED0 - LED15
U2
U3
U4
U1
Designator
2.2 µF
82Ω
121Ω
140Ω
2.2k
100k
DB25T
SCHOTTKY Rectifier
HEADER 2X2
green, red, blue or white
Level Shifter
Level Shifter
3 state quad buffers
LED driver
(Continued)
Description
0805
0805
0603
0603
0603
0603
0603
805 2x
0805 2x
0.15" SOIC16
0.15" SOIC16
0.15" SOIC14
SQA24
Footprint
3
write is off (the box is not checked), changes will take place
only after pressing “Write All.” Any LED that is programmed
while auto write is off will only take place if “Write All” button
is pressed before auto write is on; otherwise, these LEDs will
go back to their previous states.
Reset — Resets the LP3944 in its default state and erases
all previously programmed value on the control panel to
reflect the LP3944 default state.
Write All — All programmed values on the control panel will
be executed when this button is pressed.
Read All — All ten registers will be read from the chip to
refresh the control panel when this button is pressed.
Quit — Quits the program.
TDK
TDK
On Semi MBRM120
Vishay or Osram
On Semi MC14504B
On Semi MC14504B
Fairchild MM74HC125M
NSC LP3944ISQ
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