LP3943

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SNVS256A – MAY 2004 – REVISED MAY 2004

LP3943 RGB/White/Blue 16-LED Fun Light Driver

Check for Samples: LP3943

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FEATURES

APPLICATIONS

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Internal power-on reset

•

Customized flashing LED lights for cellular

phones

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Active low reset

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Portable Applications

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Internal precision oscillator

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Digital Cameras

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Variable dim rates (from 6.25 ms to 1.6s; 160

Hz–0.625 Hz)

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Indicator Lamps

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General purpose I/O expander

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Toys

DESCRIPTION

LP3943 is an integrated device capable of independently driving 16 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 LP3943 contains the ability to dim LEDs

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. LP3943 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.

Table 1. Key Specifications

16 LED driver (multiple programmable states—on, off, input, and dimming at a specified rate)

16 Open drain outputs capable of driving up to 25 mA per LED

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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.

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All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Copyright © 2004, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.