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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Technical Data
Thermal Resistance

The definition and how to use thermal resistance and thermal characterization parameter of packages for ROHM’s integrated circuit are described in this application note.

NE Handbook Series

Sensor Networks