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 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.
For all available packages, see the orderable addendum at the end of the data sheet.| Type | Title | Date | ||
|---|---|---|---|---|
| * | Data sheet | LP3943 16-Channel RGB, White-LED Driver With Independent SMBUS/I2C String Control datasheet (Rev. D) | PDF | HTML | 04 Nov 2016 |
| White paper | Common LED Functions and LED Driver Design Considerations | 21 Sep 2020 | ||
| Application note | How to Select a RGB LED Driver | 08 Aug 2019 | ||
| User guide | AN-1300 LP3943 Evaluation Kit (Rev. B) | 30 Apr 2013 | ||
| Application note | AN-1715 LP3943/LP3944 as a GPIO Expander (Rev. A) | 30 Apr 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
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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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