Patent ID: 7671669

Claim:
A device for reducing input noise, comprising: a signal input terminal; a RC circuit with a first RC circuit end and a second RC circuit end; and a microcontroller, comprising: a noise reduction device, having a first noise reduction device end and a second noise reduction device end, wherein the first noise reduction device end being connected to the signal input terminal; an analog switch, having a first analog switch end and a second analog switch end, wherein the first analog switch end being connected to both the signal input terminal and the first noise reduction device end of the noise reduction device; a control unit, being connected to the noise reduction device and the analog switch to control the noise reduction device and the analog switch to be turned on or turned off; a signal output unit, having a first signal output unit end being connected to the second analog switch end, and a second signal output unit end being connected to the first RC circuit end; and an oscillation circuit, for providing an oscillation frequency to the control unit, and having a first oscillation circuit end being connected to the second RC circuit end.