Direct-current fan control chip

A packaged direct-current fan control chip for controlling a fan that has a permanent magnet rotor and has stator coils arranged to form an angle between the stator coils, the packaged direct current fan control chip comprising:

• a chip package having a top surface;
• a magnetoresistive sensor having a sensing direction,
• a controller,
• a driver, and
• a substrate,
• wherein the magnetoresistive sensor, the controller and the driver are all integrated on the substrate and contained within the chip package,
• wherein the sensing direction of the magnetoresistive sensor is perpendicular to or parallel to the top surface of the chip package, and the chip package is configured to be positioned to bisect the angle and the magnetoresistive sensor within the chip package is configured to detect a position, speed and rotation direction of the permanent magnet rotor,
• wherein the magnetoresistive sensor provides the controller with a rotor position signal, a rotor speed signal, and a rotor rotation direction signal based on the detected position, speed and rotation direction of the permanent magnet rotor, and
• wherein the controller outputs a control signal to the driver according to the received signals, after receiving the control signals, the driver outputs a drive signal to drive the stator coils.