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Using WS2811 as IO expander

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Hi , some questions about WS2811

  1. does it - always - remain in output high Z state , after power on ?
  2. when it is driven to 100% LOW , (255) , is it always low , or is there a glitch 1/256 of the time , at each PWM period , as for some other devices ?
  3. what should be a right pull-up resistor value , under 5 volts , in order to drive , for example , 74HC devices ?
  4. max length between twoWS2811 : might it be longer as , for exemple between two 74HC595 ?
    ps. : I can also read a chines translated datasheet , thanks !

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