BU21181FS

Datasheet Capacitive Switch Controller ICs Capacitive Switch Controller IC BU21181FS 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 Key Specifications  Power Supply Voltage Range:  Operating Temperature Range:  Operating Current: 3.0 V to 5.5 V -25 °C to +85 °C 2.5 mA (Typ) Package SSOP-A32 W (Typ) x D (Typ) x H (Max) 13.6 mm x 7.8 mm x 2.01 mm 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 Typical Application Circuit VDD 4.7 μF VDD 0.1 μF 1.0 μF (Note 2) 1 VDD VSS AVDD CS0 CS1 CS2 CS3 CS4 CS5 CS6 CS7 CS8 CS9 CS10 CS11 CS12 16 32 RSTB DVDD SCL SDA INTB GPIO4 GPIO3 GPIO2 GPIO1 GPIO0 TEST CS17 CS16 CS15 CS14 CS13 17 1.0 μF (Note 1) HOST Sensor Electrode (Note 1) The pull-up resistors for the SDA and SCL pins must be connected to VDD. Choose the value of the pull-up resistors so as to meet 2-wire Se...