WS2818B

WS2818B 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 20V voltage programmable constant current output drive. It effectively ensures that the color of the pixel point light on the driving circuit is highly consistent. IC use single NZR communication mode. After the chip power - on reset, the DIN1 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 DIN1 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 justl to OUTR, OUTG, OUTB port, after receive a low voltage reset signal the time retain over 280ps. SOP8, CPC8 and FSOP8 package types available.

Applications

• LED full color decorative lighting, such as LED string, LED strip, LED module etc.
• Indoor/outdoor LED video or irregular screen
• LED consumer electronics

Key features

• R, G, B output port withstand voltage 20V, DIN 1, DIN2 port withstand voltage 9V
• Built - in voltage - regulator tube, only a resistance needed to add to IC VDD feet when under 24V power supply
• 256 Gray - scale adjustable and scan frequency is more than 2KHz
• 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