The 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 in SMBUS/I2C applications where it is required, to cut down on bus traffic.
Traditionally, dimming LEDs using a serial shift register such as 74LS594/5 requires a large amount of traffic on the serial bus. The 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 to an ON or OFF state, or to cycle a programmed frequency and duty cycle. Maximum output sink current is 25mA per pin and 200mA per package. Any ports not used for controlling the LEDs can be used for general purpose input/output expansion.
| Top documentation | Type | Title | Format options | Date |
|---|---|---|---|---|
| * | Data sheet | LP3943 16-Channel RGB, White-LED Driver with Independent SMBUS/I2 C String Control datasheet (Rev. E) | PDF | HTML | Oct 9, 2024 |
| White paper | Common LED Functions and LED Driver Design Considerations | Sep 21, 2020 | ||
| Application note | How to Select a RGB LED Driver | Aug 8, 2019 | ||
| EVM User's guide | AN-1300 LP3943 Evaluation Kit (Rev. B) | Apr 30, 2013 | ||
| Application note | AN-1715 LP3943/LP3944 as a GPIO Expander (Rev. A) | Apr 30, 2013 |
For additional terms or required resources, click any title below to view the detail page where available.
RGB/White/Blue 16-LED Fun Light Driver
The BOOSTXL-CAPKEYPAD is an easy-to-use evaluation module (EVM) for the MSP430FR2522 capacitive touch sensing microcontroller (MCU) with CapTIvate™ technology. The BOOSTXL-CAPKEYPAD can be used in three different ways - with a LaunchPad™ development kit, with the CapTIvate (...)
The Linux driver supports the LP3943 16-LED Fun Light Driver. The Linux driver supports communication through the I2C bus and interfaces with the GPIO and PWM sub-systems.
Available in Linux Main line: Yes
Available through git.ti.com: N/A
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| WQFN (RTW) | 24 | Ultra Librarian |
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