To the extent a reference may not be fully incorporated herein, it is incorporated by reference for background purposes and indicative of the knowledge of one of ordinary skill in the art. Any references cited hereafter are incorporated by reference to the maximum extent allowable by law. The contents of the applications referenced in the tables above are not necessarily identical to the contents of this application. §120 is claimed for all of the above referenced commonly owned applications. 09/540,291, entitled, “Brushless DC Fan Module Incorporating Integral Fan Control Circuit With a Communication Port For Receiving Digital Commands to Control Fan.” This application claims the benefit of and is a continuation of U.S. The entire fan control circuit may be incorporated within the fan housing and a simple serial two-wire interface may be provided in addition to the two power terminals for the fan, resulting in a compact four-wire interface for the fan module. In some embodiments the temperature of the fan or of the air flow through the fan may be reported bark when queried. The actual speed of the fan may be reported back when queried by the host system. A variety of commands such as on/off, and various speed control settings may be received from the host system. In one embodiment, the fan module interfaces with a two-wire serial bus, such as an 12C bus or SMbus, and accepts commands and provides status and data in a serial digital format. ![]() A fan module includes integral fan control circuitry which independently implements a self-contained start and run motor control loop and also includes a communications port to accept commands from a host processor and to provide status and other data in response to queries from the host processor.
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