Ws2811 m is a special circuit for three channel LED drive and control, and the development of color light strip scheme

WS2811 M It's three channels LED Drive control special circuit , The chip contains an intelligent digital interface data latch signal shaping and amplification drive circuit ,

It also includes high-precision internal oscillator and 12V Programmable constant current output driver . meanwhile , In order to reduce the power ripple ,3 Each channel has a certain delay

Time conduction function , So when the frame is refreshed , It can reduce the circuit ripple .

The chip adopts the communication mode of single line zeroing code , After the chip is powered on and reset , DIN The terminal receives the data transmitted from the controller , First send it

Of 24bit After the data is extracted by the first chip , Sent to the data latch inside the chip , The remaining data is shaped and amplified by the internal shaping processing circuit

adopt DO The port begins to forward the output to the next cascaded chip , Every transmission through a chip , Signal reduction 24bit. The chip adopts automatic shaping

Forwarding technology , The number of cascades of the chip is not limited by signal transmission , Only limited signal transmission speed requirements .

The data latch inside the chip is based on the received 24bit data , stay OUTR、OUTG、OUTB The control end generates different duty cycle control signals

Number , wait for DIN End input RESET Signal time , All chips synchronously send the received data to each segment , The chip will be reconnected after the signal ends

Subject to new data , After accepting the beginning 24bit After the data , adopt DO Port forward data port , The chip did not receive RESET Pre code ,OUTR、

OUTG、OUTB The original output of the pin remains unchanged , When you receive 50μs Above low level RESET After code , The chip will just receive 24bit PWM

The data pulse width is output to OUTR、OUTG、OUTB On the pin .