WS 2811 Si gnal l i ne 256 G ray l e vel 3 c hann el Cons t ant c ur rent L E D dr i ver IC Featu re Ap p li cati on s Output port compression 12V. LED decorative lighting. Built-in voltage-regulator tube, only a resistance Indoor/outdoor LED video or irregular screen. needed to add to IC VDD feet when under 24V power supply. 256 Gray-scale adjustable and scan frequency is more than 2 K H z. Built in signal reshaping circuit, to ensure waveform distortion do not accumulate after wave reshaping to the next driver Built-in electrify reset circuit and power-down reset circuit. Cascading port transmission signal by single line. Any two point the distance less than 5 Meters transmission signal without any increase circuit. When the refresh rate is 30fps, the cascade number is at least 1024 pixels. Send data at speed of 800Kbps. Ge n eral d es cri p ti on The WS2811 is 3 output channels special for LED driver circuit. Its internal includes intelligent digital port data latch and signal reshaping amplification drive circuit. Also include a precision internal oscillator and a 12V voltage programmable constant current output drive. In the purpose of reduce power supply ripple, the 3 output channels designed to delay turn-on function. IC use single NZR communication mode. After the chip power-on reset, the DIN port receive data from controller, the first IC collect initial 24bit data then sent to the internal data latch, the other data which reshaping by the internal signal reshaping amplification circuit sent to the next cascade IC through the DO port. After transmission for each chip, the signal to reduce 24bit. IC adopt auto reshaping transmit technology, making the chip cascade number is not limited the signal transmission, only depend on the speed of signal transmission. The data latch of IC depend on the received 24bit data produce different duty ratio signal at OUTR, OUTG, OUTB port. All chip synchronous send the received data to each segment when the DIN port input a reset signal. It will receive new data again After the reset signal finished. Before a new reset signal received, the control signal of OUTR ,OUTG, OUTB port unchanged. IC sent PWM data that received justly to OUTR, OUTG, OUTB port, after receive a low voltage reset signal the time retain over 2 8 0s. We offer TWO package SOP8 and MSOP8. 1 / 8 h ttp :/ / www.worl d -s emi .comWS 2811 Si gnal l i ne 256 G ray l e vel 3 c hann el Cons t ant c ur rent L E D dr i ver IC PI N con f i gurati on PI N f un cti on N O . Sy mb o l PI N Fu nc ti o n de s c r ip tio n 1 OUTR LED Driver Output Output of RED PWM control 2 OUTG LED Driver Output Output of GREEN PWM control 3 OUTB LED Driver Output Output of BLUE PWM control 4 GND Ground Data & Power Grounding 5 DO DO Data Output 6 DIN Data Input Control data input 7 NC NC NC 8 VDD Power Voltage IC power supply Ab s ol u te Maxi mu m Rati n gs (T =25, V =0V, unless otherwise noted.) A SS P ar a me te r Sy m bo l R a tin g s U ni t Power Supply Voltage V +3.5~+5.3 V DD Logical Input Voltage V VDD-0.5VDD+0.5 V I Operation Temperature Topt -25+85 Storage Temperature Range Tstg -40~105 R/G/B Channel Output Port Withstand Voltage Vout 12 V Note: If the voltage on the pins exceeds the maximum ratings may cause permanent damage to the device. 2 / 8 h ttp :/ / www.worl d -s emi .com