General Description

BU21181FS is a capacitive switch controller that detects

capacitance change and judges the operation of Switch

ON / OFF or Long Press. The function to prevent false

detection of water enables it to be used at places using

water.

Features

 18 Capacitive Sensor Pins

 Switch ON / OFF / Long Press Detection

 Inform Detection Results by Interrupt Pin

 Prevention False Detection by Water

 Noise Calibration Function

 Drift Calibration Function

 Adjust Sampling Period Function

 2-wire Serial Bus Interface

 Single Power Supply

Applications

 Home Appliance such as IH Cooker, Refrigerator and

Rice Cooker

 AV Appliance such as TV and HDD Recorder

 Office Automation Appliance such as Printer

 Electrical Equipment with Multiple Switches