LP3943ISQEV/NOPB National Semiconductor, LP3943ISQEV/NOPB Datasheet - Page 3

• Manufacturer Part Number: LP3943ISQEV/NOPB
• Description: BOARD EVAL FOR LP3943 FUNLIGHT
• Manufacturer: National Semiconductor
• Series: PowerWise®r

Specifications of LP3943ISQEV/NOPB

• Current - Output / Channel: 25mA
• Outputs And Type: 16, Non-Isolated
• Voltage - Output: 4 V
• Features: Dimmable
• Voltage - Input: 2.3 ~ 5.5 V
• Utilized Ic / Part: LP3943
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: *LP3943ISQEV; *LP3943ISQEV/NOPB; LP3943ISQEV

The Control Panel
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 LP3943 in its default state and erases all
previously programmed value on the control panel to reflect
the LP3943 default state.
Bill of Material for LP3943
The brightness of LED is controlled by how much current goes through it. On the LP3943 evaluation board, resistors R0 to R15
set the current going through LED0 to LED15, respectively. Except for R7, R8 and R9, the rest of the resistors are 82ohm to
program 15mA through each LED. R7=120ohm to provide 15mA for blue LED, R8=140ohm to provide 20mA for red LED, and
R9=82ohm to program 15mA for green LED. These resistors are chosen to provide full-scale intensity when the LED is at 100%
of the duty cycle.
Designator
C1, C2, C3, C5, C7, C8, C9
C4, C6
R0 – R15, except R7, R8
R7
R8
RSCL, RSDA
RA0, RA1, RA2
K1
D1, D2
JP1
LED0 - LED15, except 7,8,9
LED7,8,9
U2
U3
U4
U1
(Continued)
Description
0.1uF, ceramic
2.2uF, ceramic
82ohm
120ohm
140ohm
2.2k
100k
DB25T
SCHOTTKY Rectifier
HEADER 2X2
blue
RGB
Level Shifter
Level Shifter
3 state quad buffers
LED driver
3
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.
Footprint
0805
0805
0603
0603
0603
0603
0603
DB25T
0805
0805
0.15" SOIC16
0.15" SOIC16
0.15" SOIC14
LQA24A
Comment
TDK C2012X7R1H104K
SPC Tech
On Semi MBRM120
SPC Tech
Vishay or Osram
Sharp
On Semi MC14504B
On Semi MC14504B
Fairchild MM74HC125M
NSC LP3943ISQ
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