LP3943ISQEV/NOPB National Semiconductor, LP3943ISQEV/NOPB Datasheet
LP3943ISQEV/NOPB
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
*LP3943ISQEV/NOPB
LP3943ISQEV
© 2004 National Semiconductor Corporation
LP3943 Evaluation Kit
LP3943 Overview
The LP3943 is an integrated device capable of indepen-
dently driving 16 LEDs. This device also contains an internal
oscillator that provides all the necessary timing required for
driving LED. Two prescaler registers along with two PWM
registers provide a versatile duty cycle control. The LP3943
contains the ability to dim/blink LEDs in SMBUS/I
cations. For more information, please refer to the LP3943
datasheet.
Evaluation Kit Overview
LP3943 Evaluation Kit contains the evaluation board and PC
software, and supports complete functional evaluation of the
LP3943. All functions of the chip can be programmed via the
use of the I
emulates the I
logic to interface to PC’s parallel port and all necessary level
shifting is provided.
Getting Started
The following instructions show how to use the LP3943
evaluation kit in default conditions. Please use the ESD
protection (ground cable) to prevent any unwanted damag-
ing ESD events.
LP3943 software in virtual LED mode with all LEDs turned on (this is not the default state).
2
C interface port. The PC software provided
2
C bus communication protocol. Hand shaking
AN200847
2
C appli-
National Semiconductor
Application Note 1300
Mary F Kao
October 2004
Install the evaluation software on a PC by copying the
“LP3943.exe” from the CD to the LP3943 folder in your
computer. There are two ways to launch the software. One
way is without the evaluation board. Another way is with the
evaluation board connected to the cable.
Launching the software without the evaluation board:
1. Start the software by double-clicking on its icon. A mes-
2. The default conditions of the virtual LEDs are different
sage will appear stating that the LP3943 board is not
detected, and will ask if the user wants to switch to
virtual LED mode. Click “Yes.”
than that of the LP3943. Please be aware that the virtual
LEDs simulate the functionality of the LP3943, but they
do not perform exactly to the specification. To truly
evaluate the LP3943, please request for a LP3943
evaluation board.
20084701
www.national.com
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LP3943ISQEV/NOPB Summary of contents
Page 1
... Please use the ESD protection (ground cable) to prevent any unwanted damag- ing ESD events. LP3943 software in virtual LED mode with all LEDs turned on (this is not the default state). © 2004 National Semiconductor Corporation National Semiconductor Application Note 1300 Mary F Kao ...
Page 2
Getting Started (Continued) Launching the software with the evaluation board connected to the LPT cable: 1. Connect a power supply (typically 5V) to “VDD” and “GND” pins. Power supply’s negative terminal should be connected to “GND” and positive to “VDD”. ...
Page 3
The Control Panel (Continued) 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 ...
Page 4
www.national.com 4 ...
Page 5
... BANNED SUBSTANCE COMPLIANCE National Semiconductor certifies that the products and packing materials meet the provisions of the Customer Products Stewardship Specification (CSP-9-111C2) and the Banned Substances and Materials of Interest Specification (CSP-9-111S2) and contain no ‘‘Banned Substances’’ as defined in CSP-9-111S2. ...