Patent ID: 8106610

Claim:
A heat dissipation device comprising: a main controller being mounted on a circuit board; and a fan module having a motor coil; a connection interface being connected to the circuit board and having a control pin electrically connected to the main controller and receiving a control signal sent from the main controller; an error report pin electrically connected to the main controller; and a power supply pin and a ground pin deriving operating power; a Pulse-Width Modulation (PWM) circuit being electrically connected to the motor coil, changing current magnitude and current direction of the motor coil to drive the fan module and being connected to the power supply pin and ground pin of the connection interface to attain the operating power; and a fan monitor chip being electrically connected to the connection interface and the PWM driving circuit, attaining operating power via the power supply pin and ground pin, receiving the control signal via the control pin, generating and sending PWM signals to the PWM driving circuit according to the control signal and sending an acknowledgement signal to the main controller via the control pin after receiving the control signal wherein the acknowledgement signal is provided for the main controller to check whether the fan monitor chip have received the control signal correctly.