LP3943ISQ/NOPB
TEXAS INSTRUMENTS LP3943ISQ/NOPB 发光二极管驱动器, 16输出, 升压逐步上升, 2.3V-5.5V输入, 400kHz开关, 25mA输出, WQFN-24
The 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.
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- Internal power-ON reset
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- Active low reset
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- Internal precision oscillator
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- Variable dim rate from 6.25ms to 1.6s, 160 to 0.625Hz
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- 16 LED drivers multiple programmable states - on, off, input and dimming at a specified rate
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- 16 Open-drain outputs capable of driving up to 25mA per LED
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- Green product and no Sb/Br
