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WS2811 M是三通道LED驱动控制专用电路彩灯带方案开发
2022-07-04 12:47:00 【51CTO】
WS2811 M是三通道LED驱动控制专用电路,芯片内部包含了智能数字接口数据锁存信号整形放大驱动电路,
还包含有高精度的内部振荡器和 12V 可编程定电流输出驱动器。 同时,为了降低电源纹波,3个通道有一定的延
时导通功能,这样在帧刷新时,可降低电路纹波。
芯片采用单线归零码的通讯方式,芯片在上电复位以后, DIN 端接受从控制器传输过来的数据,首先送过来
的24bit数据被第一个芯片提取后,送到芯片内部的数据锁存器,剩余的数据经过内部整形处理电路整形放大后
通过DO端口开始转发输出给下一个级联的芯片,每经过一个芯片的传输,信号减少24bit。 芯片采用自动整形
转发技术,使得该芯片的级联个数不受信号传送的限制,仅仅受限信号传输速度要求。
芯片内部的数据锁存器根据接受到的24bit数据,在OUTR、OUTG、OUTB控制端产生不同的占空比控制信
号, 等待DIN端输入RESET信号时,所有芯片同步将接收到的数据送到各个段,芯片将在该信号结束后重新接
受新的数据,在接受完开始的24bit数据后,通过DO口转发数据口,芯片在没有接受到RESET码前,OUTR、
OUTG、OUTB管脚原输出保持不变,当接受到50μs以上低电平RESET码后,芯片将刚才接收到的24bit PWM
数据脉宽输出到 OUTR、OUTG、OUTB 引脚上。
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