ws2801是一个恒定电流led驱动器，它主要为室内/外led显示屏，和装饰性led照明系统而设计，非常适合用
于需要接力串接的led照明系统，ws2801拥有3个独立的输出驱动通道，每个通道均能实现独立的256级pwm
灰度控制，可在不改变led发光色彩的条件下实现256级led灰度控制，并能输出高达120ma的恒定led驱动电
流，ws2801内部包含串联移位寄存器，数据锁存器，输出寄存器，带隙基准电压源，内部振荡器和可编程恒定
电流驱动器。
从sdi数据输入的串行数据在cki口时钟信号的上升沿被读入到芯片内部的数据移位寄存器中，输入的时钟信号和
led灰度控制信号在芯片内部经过时钟数据再生电路整形后在cko和sdo端输出，以使芯片能够接力串接工作。
当pol=“0”时，输出极性反转，ws2801工作如同一个pwm控制器，能够驱动外接的开关或者电路驱动高亮
度的led，并实现大功率led的256级灰度控制。ws2801的2-线传输控制协议具有速度快，可靠性高，灰度数据
同步刷新等特点，能够最大限度的降低系统成本，非常适合用于低成本的led装饰照明系统。
ws2801提供sop-14封装或者dip-14封装，其使用温度范围为-40~85℃。
the ws2801 is a constant current led driver. it is designed forindoor/ outdoor led displays and decorative
led lighting system. it is suitable for led cascading applications.the ws2801ownes 3 output channels, each
channel can drive a constant current up to 120ma. ws2801 containsserial shift registers, data latches, output
registers, band gap reference voltage generator, internaloscillator, and programmable constant output current
drivers. the serial data is read into the shift registers at therise edge of the external clock. the data and clock
output buffers are designed for cascading another chip. the outputpolarity reverse function is designed for
driving high power led by adapting the application circuitry. thews2801 adopts the reliable 2-wire scheme,
which features low emi transport, very strong anti-interferenceability, and supports hot-swap. the 2-wire
control scheme can reduce the system cost; it is very suitable forlow cost led decorative led lighting
systems.
ws2801 is available in both sop-14 and dip-14 packages, theoperating temperature is -40~85℃

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韦先生
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