WS2811

WS2811 Signal line 256 Gray level 3 channal Constant current LED drive IC Feature Applications l Output port compression 12V. l LED decorative lighting. l Built in stabilivolt, Only add a resistance to IC l Indoor/outdoor LED video or irregular screen. VDD feet when under 24V power supply. l Gray level 256 can be adjusted and scan freque ncy not less than 400Hz/s. l Built in signal reshaping circuit,after wave resha- ping to the next driver, ensure wave-form distor- tion not accumulate. l Built-in electric reset circuit and power lost reset circuit. l Cascading port transmission signal by single lin- e. l Any two point the distance more than 10m tran- smission signal without any increasecircuit. l When the refresh rate is 30fps, low speedmodelc ascade number are not less than 512 points, hig- h speed mode not less than1024 points. l Send data at speeds of up to 400 Kbps and 800 Kbps two patterns. General description The WS2811 is 3 output channels special for LED driver circuit. It internal include 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 outp- ut channels designed to delay turn-on function. IC use single NZR communication mode.After the chip power-on reset, the DIN port receivedata from con troller, the first IC collect initial 24bit data then sent to the internal data latch, theother 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 50us. We offer two package SOP8 and DIP8. WS2811 Signal line 256 Gray level 3 channal Constant current LED drive IC PIN configuration PIN function NO. Symbol Function description 1 OUTR Output of Red PWM control 2 OUTG Output of Green PWM control 3 OUTB Output of Blue PWM control 4 GND Ground 5 DOUT Data signal cascade output 6 DIN Data signal input Set work mode of IC as low speed model(connect VDD) 7 SET or high speed model(vacant) 8 VDD Power supply voltage Absolute Maximum Ratings Prameter Symbol Ratings Unit Power supply voltage V +6.0~+7.0 V DD Output voltage V 12 V OUT Input voltage V -0.5VDD+0.5 V I Operation junction Topt -25+85 temperature Storage temperature range Tstg -55~+150 Note: If the voltage on the pins exceeds the maximum ratings may cause permanent damage to the device.