App note: Fan health monitoring and the MIC502

appnote

An application note from Micrel:  Fan health monitoring and the MIC502 (PDF!)

This section presents a fan monitoring circuit that can be used in conventional MIC502-based circuits employing pulse-width modulation (PWM) fan speed control. The circuit relies on detecting motor commutation to indicate fan operation and does not require a three wire fan with a tachometer output.

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