MAX6653: FAQ

MAX6653: FAQ
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    如何检测2线风扇的速度？

    2线风扇只有电源和GND连接端，不带转速计输出信号。可以通过在系统地和风扇地之间增加一个电阻实现转速检测。当风扇电机工作时，其电源电流波动会在检流电阻上产生压降，根据压降的大小判断转速的快慢。如下图所示：

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