LP3944ISQEV National Semiconductor, LP3944ISQEV Datasheet
LP3944ISQEV
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
-
© 2004 National Semiconductor Corporation
LP3944 Evaluation Kit
LP3944 Overview
The LP3944 is an integrated device capable of indepen-
dently driving 8 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 LP3944
contains the ability to dim/blink LEDs in SMBUS/I
cations. For more information, please refer to the LP3944
datasheet.
Evaluation Kit Overview
LP3944 Evaluation Kit contains the evaluation board and PC
software and supports complete functional evaluation of the
LP3944. 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 LP3944
evaluation kit in default conditions. Please use the ESD
protection (ground cable) to prevent any unwanted damag-
ing ESD events.
2
LP3944 software in virtual LED mode with all LEDs turned on (this is no the default state)
C interface port. The PC software provided
2
C bus communication protocol. Hand shaking
AN201274
2
C appli-
National Semiconductor
Application Note 1344
Mary F Kao
October 2004
Install the evaluation software on a PC by copying the
“LP3944.exe” from the CD to the LP3944 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 LP3944 board is not
detected, and will ask if the user wants to switch to
virtual LED mode. Click “Yes.”
than that of the LP3944. Please be aware that the virtual
LEDs simulate the functionality of the LP3944, but they
do not perform exactly to the specification. To truly
evaluate the LP3944, please request for a LP3944
evaluation board.
20127401
www.national.com
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LP3944ISQEV Summary of contents
Page 1
... Please use the ESD protection (ground cable) to prevent any unwanted damag- ing ESD events. LP3944 software in virtual LED mode with all LEDs turned on (this is no the default state) © 2004 National Semiconductor Corporation National Semiconductor Application Note 1344 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 “V “GND” pins. Power supply’s negative terminal should be connected to “GND” and positive to “V provide ...
Page 3
The Control Panel (Continued) 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 ...
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. ...