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LP3944

Texas Instruments
Part Number LP3944
Manufacturer Texas Instruments
Description RGB/White/Blue 8-LED Fun Light Driver
Published Jul 9, 2020
Detailed Description LP3944 www.ti.com SNVS264A – MAY 2004 – REVISED APRIL 2013 LP3944 RGB/White/Blue 8-LED Fun Light Driver Check for Sam...
Datasheet PDF File LP3944 PDF File

LP3944
LP3944

Overview
LP3944 www.
ti.
com SNVS264A – MAY 2004 – REVISED APRIL 2013 LP3944 RGB/White/Blue 8-LED Fun Light Driver Check for Samples: LP3944 FEATURES 1 •2 Internal Power-on Reset • Active Low Reset • Internal Precision Oscillator • Variable Dim Rates (from 6.
25 ms to 1.
6s; 160 Hz–0.
625 Hz) APPLICATIONS • Customized Flashing LED Lights for Cellular Phones • Portable Applications • Digital Cameras • Indicator Lamps • General Purpose I/O Expander • Toys KEY SPECIFICATIONS • 8 LED Driver (Multiple Programmable States—On, Off, Input, and Dimming at a Specified Rate) • 8 Open Drain Outputs Capable of Driving up to 25 mA per LED DESCRIPTION LP3944 is an integrated device capable of independently driving 8 LEDs.
This device also contains an internal precision oscillator that provides all the necessary timing required for driving each LED.
Two prescaler registers along with two PWM registers provide a versatile duty cycle control.
The LP3944 contains the ability to dim LEDs in SMBUS/I2C applications where it is required to cut down on bus traffic.
Traditionally, to dim LEDs using a serial shift register such as 74LS594/5 would require a large amount of traffic to be on the serial bus.
LP3944 instead requires only the setup of the frequency and duty cycle for each output pin.
From then on, only a single command from the host is required to turn each individual open drain output ON, OFF, or to cycle a programmed frequency and duty cycle.
Maximum output sink current is 25 mA per pin and 200 mA per package.
Any ports not used for controlling the LEDs can be used for general purpose input/output expansion.
Typical Application Circuit +5V 5V SMBUS /I2C RGB SDA SCL PORTx.
D Cell Phone Baseband Controller/PController VDD SDA SCL RESET A2 A1 A0 LED7 LED6 LED5 LED4 LED3 LED2 LED1 LED0 GND +5V Blue LEDs 1 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers the...


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