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tach output introduction(FG signal)

来源:未知  发布时间:2017-08-23 19:52

tach output introduction(FG signal)

      Fan with FG function will creat a square wave output.You can know fan speed by sensing the output wave frequency.Most dc fan have four pole.So when fan run for one round,there will be two high level pulse. About other Multipole brushless fan,high level pulse will be different.
      But please notice if you want to sense it’s output wave,there is a external circuit. Please check the circuit,Diagram below. There is no pull-up and VCC value limit.But please notice the Max Iin have to be small than 20mA.
fg1fg2

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