16 channel RGB/White LED driver with independent string control via SMBUS/I2C | RTW | 24 | -40 to 85

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.