LP3943ISQEV/NOPB National Semiconductor, LP3943ISQEV/NOPB Datasheet - Page 2

• 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

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Getting Started
Launching the software with the evaluation board
connected to the LPT cable:
1. Connect a power supply (typically 5V) to “VDD” and
The Control Panel
Individual LED settings – allows the user to program LED0
to LED15 by turning it on or off, or dimming/blinking at a
specified rate. DIM0 corresponds to the values programmed
in PWM0 and PSC0 registers. DIM1 corresponds to the
values programmed in PWM1 and PSC1 registers. The de-
fault state is off for all LEDs.
DIM0 – The sliding bars control the PSC0 and PWM0 reg-
isters. The PSC0 register is used to program the period of
DIM0 (6.25msec to 1.6sec). The PWM0 register is used to
program the duty cycle of DIM0 (0% to 100%). The default
values are 6.25msec and 50% duty cycle.
DIM1 – The sliding bars control the PSC1 and PWM1 reg-
isters. The PSC1 register is used to program the period of
DIM1 (6.25msec to 1.6sec). The PWM1 register is used to
program the duty cycle of DIM1 (0% to 100%). The default
values are 6.25msec and 50% duty cycle.
Registers – This display shows the current status of the ten
registers (in hex) in the LP3943. Registers 00 and 01 are
read-only registers that can be updated by clicking on the
buttons. The other registers can be updated by clicking on
“Read All.”
“GND” pins. Power supply’s negative terminal should be
connected to “GND” and positive to “VDD”. This will
provide power to the LP3943 and the LEDs. Jumper JP1
should be in the “VDD” position. For added flexibility, a
separate power supply can be connected to “VEXT” to
supply power to LEDs, with jumper JP1 in the “VEXT”
position.
LP3943 software launched with evaluation board connected to LPT cable (in default state).
(Continued)
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2. The evaluation board is now ready for operation. Turn on
3. Connect the LPT cable to the evaluation board and the
4. Start the software by double-clicking on its icon.
5. The evaluation kit is now ready to use and the LP3943
COMM – Message indicating proper/improper I2C commu-
nication. Upon successful communication, “Ack OK” with
green background will be displayed. Otherwise, “NoAck” with
red background will be displayed. Errors include absence of
power supply to the evaluation board, absence of LPT cable
connection, and wrong LPT port address.
LPT Base – Three options for LPT port setting. Default value
is 378.
Demos to screen – By selecting this option, the individual
LED settings panel will become active to reflect the states of
LEDs in demos.
Demo1 – Music demo. The LEDs are controlled by the
amplitude of the music.
Demo2 – Music demo. 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
the power supply.
LPT port of your PC.
can be programmed and controlled through the PC
software.
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