Datasheet > LP3944

LP3944

更新时间： 2024-11-16 11:10:47

品牌	Logo	应用领域
德州仪器 - TI		驱动驱动器
页数	文件大小	规格书
21页	762K
描述
RGB/白光/蓝光 8 LED 闪烁光驱动器

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LP3944 数据手册

LP3944

www.ti.com

SNVS264A –MAY 2004–REVISED APRIL 2013

LP3944 RGB/White/Blue 8-LED Fun Light Driver

Check for Samples: LP3944

FEATURES

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.

•

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

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.

•

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

Typical Application Circuit

+5V

SMBUS

+5V

/I C

Blue LEDs

LED7

LED6

LED5

SDA

SCL

SDA

SCL

PORTx.D

RESET

LED4

LED3

LED2

LED1

LED0

Cell Phone Baseband

Controller/mController

GND

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

12 3 4 5 6 7...21

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与LP3944相关器件

型号	品牌	获取价格	描述	数据表
LP3944ISQ	NSC	获取价格	RGB/White/Blue 8-LED Fun Light Driver
LP3944ISQ/NOPB	TI	获取价格	RGB/白光/蓝光 8 LED 闪烁光驱动器 \| RTW \| 24 \| -40 to 85
LP3944ISQX	NSC	获取价格	RGB/White/Blue 8-LED Fun Light Driver
LP3944ISQX/NOPB	TI	获取价格	RGB/白光/蓝光 8 LED 闪烁光驱动器 \| RTW \| 24 \| -40 to 85
LP3945	NSC	获取价格	Battery Charge Management System
LP3945ILD	NSC	获取价格	Battery Charge Management System
LP3945ILDX	NSC	获取价格	Battery Charge Management System
LP3945LD	TI	获取价格	IC,BATTERY MANAGEMENT,LLCC,14PIN,PLASTIC
LP3945LDX	TI	获取价格	IC,BATTERY MANAGEMENT,LLCC,14PIN,PLASTIC
LP3945LDX	NSC	获取价格	IC,BATTERY MANAGEMENT,LLCC,14PIN,PLASTIC

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