LP3943ISQ/NOPB Datasheet PDF - TI

●The LP3943ISQ/NOPB is a 16-output LED Fun Light Driver for use with general purpose I/O expander. 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. It 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. Any ports not used for controlling the LEDs can be used for general purpose input/output expansion.

● Internal power-ON reset

● Active low reset

● Internal precision oscillator

● Variable dim rate (from 6.25ms to 1.6s, 160 to 0.625Hz)

● 16 LED drivers (multiple programmable states - on, off, input and dimming at a specified rate)

● 16 Open-drain outputs capable of driving up to 25mA per LED

● Green product and no Sb/Br