Capacitive Switch Controller ICs - BU21079F

BU21079F is a capacitive switch controller used for operating switches. Low power consumption is achieved using the intermittent operation mode. In addition to a regular simple switch, it supports matrix switches which are arranged in the matrix sensors. If external noise and temperature drift are detected, the automatic self-calibration is activated.

* This product is a STANDARD grade product and not recommend for on-vehicle devices.
Part Number
Unit Quantity
Minimum Package Quantity
Packing Type
BU21079F-E2 Active SOP16 2500 2500 Taping Yes
Vcc(Min.)[V] 3.0
Vcc(Max.)[V] 5.5
Sensor input channels 8
Interface I2C
Matrix key 4 x 4
Operating Temperature (Min.)[°C] -25
Operating Temperature (Max.)[°C] 85
  • ·8 capacitive sensor ports
    ·Supports matrix switches. Maximum of 16 switches.
    ·Automatic self-calibration
    ·Continued touch detection
    ·Sends an interrupt when there is a detected result of switch operation
    ·2-wire serial bus interface
    ·3.3V or 5.0V single power supply
    ·Built-in Power-On-Reset and Oscillator
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