Datasheet > LP3944

LP3944

更新时间： 2024-11-14 23:16:47

品牌	Logo	应用领域
美国国家半导体 - NSC		驱动器
页数	文件大小	规格书
12页	247K
描述
RGB/White/Blue 8-LED Fun Light Driver

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LP3944 数据手册

November 2003

LP3944

RGB/White/Blue 8-LED Fun Light Driver

General Description

Features

n Internal power-on reset

n Active low reset

LP3944 is an integrated device capable of independently

driving 8 LEDs. This device also contains an internal preci-

sion 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.

n Internal precision oscillator

n Variable dim rates (from 6.25 ms to 1.6s;

160 Hz–0.625 Hz)

Key Specifications

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 pro-

grammed 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.

n 8 LED driver (multiple programmable states—on, off,

input, and dimming at a specified rate)

n 8 Open drain outputs capable of driving up to 25 mA per

LED

Applications

n Customized flashing LED lights for cellular phones

n Portable Applications

n Digital Cameras

n Indicator Lamps

n General purpose I/O expander

n Toys

Typical Application Circuit

20085301

DS200853

www.national.com

12 3 4 5 6 7...12

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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