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Disclosed is a method for multiplexing signal functionality on a hot-swap fan light emitting diode (LED) and presence-detection interface. Benefits include improved functionality.
English (United States)
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100% of the total text.
Method for multiplexing signal functionality on a hot-swap
fan LED and presence-detect interface
Disclosed is a method for multiplexing signal functionality on a
hot-swap fan light emitting diode (LED) and presence-detection interface.
Benefits include improved functionality.
designs add a pin to drive the LED, resulting in additional cost and space on
the assembly. One design requires
fan connections in the middle of the PCB, where the area is surrounded by
disclosed method enables the addition of an LED indicator lamp on a hot-plug
fan without adding pins to the connector to operate the LED. The design
combines the circuit on the fan connector and the external circuit driving the
fan LED (see Figure 1). Fan presence is also detected.
reduced pin count on the fan connector is important to assure the board is
interface relies on the maximum operating forward voltage drop of the LED to
assure that the combined LED drive/present detect pin voltage cannot exceed
(typically) 3 volts if the fan is installed in the connector. When the fan is
removed, an external pull-up resistor pulls the LED drive signal to a logical
high. The presence-detect feature of the circuit works with the LED either on
disclosed method provides additional functionality to the fan connector.