16 channel RGB/White LED driver with independent string control via SMBUS/I2C
Product details
Parameters
Package | Pins | Size
Features
- Internal Power-On Reset
- Active Low Reset
- Internal Precision Oscillator
- Variable Dim Rates
(From 6.25 ms to 1.6 s; 160 Hz to 0.625 Hz) - 16 LED Drivers (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
Description
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.Technical documentation
Type | Title | Date | |
---|---|---|---|
* | Datasheet | LP3943 16-Channel RGB, White-LED Driver With Independent SMBUS/I2C String Control datasheet (Rev. D) | Nov. 04, 2016 |
White paper | Common LED Functions and LED Driver Design Considerations | Sep. 21, 2020 | |
Application note | How to Select a RGB LED Driver | Aug. 08, 2019 | |
Technical article | Here's how body electronics and lighting technology are changing the driving experience | Sep. 26, 2016 | |
Technical article | LED brightness adjustment: high-frequency PWM dimming | Aug. 26, 2016 | |
Technical article | Take better selfies with innovative LED flashes | Nov. 18, 2014 | |
Technical article | Solving the automotive EMI issues in new cars with all the screens | Sep. 11, 2014 | |
User 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 |
Design & development
For additional terms or required resources, click any title below to view the detail page where available.Hardware development
Description
RGB/White/Blue 16-LED Fun Light Driver
Features
- The LP3943 is an integrated device capable of independently driving 16 LEDs.
- This device 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 (...)
Description
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 (...)
Features
- MSP430FR2522 MSP430 MCU with CapTIvate technology
- 40-pin BoosterPack standard leveraging the LaunchPad ecosystem
- CapTIvate programming header for interfacing with CAPTIVATE-PGMR
- 12 touch button numeric keypad with proximity sensor
- Integrated LP3943 LED driver for backlighting
Software development
Linux Mainline Status
Available in Linux Main line: Yes
Available through git.ti.com: N/A
Supported Devices:
- lp3943
Linux Source Files (...)
Design tools & simulation
Features
- Leverages Cadence PSpice Technology
- Preinstalled library with a suite of digital models to enable worst-case timing analysis
- Dynamic updates ensure you have access to most current device models
- Optimized for simulation speed without loss of accuracy
- Supports simultaneous analysis of multiple products
- (...)
CAD/CAE symbols
Package | Pins | Download |
---|---|---|
WQFN (RTW) | 24 | View options |
Ordering & quality
- RoHS
- REACH
- Device marking
- Lead finish/Ball material
- MSL rating/Peak reflow
- MTBF/FIT estimates
- Material content
- Qualification summary
- Ongoing reliability monitoring
Recommended products may have parameters, evaluation modules or reference designs related to this TI product.
Support & training
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