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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.
| Top documentation | Type | Title | Format options | Date |
|---|---|---|---|---|
| * | Data sheet | LP3944 RGB/White/Blue 8-LED Fun Light Driver datasheet (Rev. A) | Apr 6, 2013 | |
| 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 | ||
| Application note | AN-1715 LP3943/LP3944 as a GPIO Expander (Rev. A) | Apr 30, 2013 | ||
| User guide | AN-1344 LP3944 Evaluation Kit (Rev. B) | Apr 30, 2013 |
For additional terms or required resources, click any title below to view the detail page where available.
The Linux driver supports the LP3944 8-LED Fun Light Driver. The Linux driver supports communication through the I2C bus and interfaces with the LED sub-system.
Available in Linux Main line: Yes
Available through git.ti.com: N/A
The (...)
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| WQFN (RTW) | 24 | Ultra Librarian |
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