Capacitive Switch Controller ICs - BU21078FV

BU21078FV is a capacitive sensor controller for switch operation. In addition to a regular simple switch, support matrix switches which are arranged in the matrix sensors. If external noise and temperature drift are detected, the automatic self-calibration is operated. Include LED controller with PWM function.

* This product is a STANDARD grade product and not recommend for on-vehicle devices.
Part Number
Unit Quantity
Minimum Package Quantity
Packing Type
BU21078FV-E2 Active SSOP-B28 2000 2000 Taping Yes
Vcc(Min.)[V] 3.0
Vcc(Max.)[V] 5.5
Sensor input channels 12
LED control channels 8
Interface I2C
Matrix key 6 x 6
Operating Temperature (Min.)[°C] -20
Operating Temperature (Max.)[°C] 85
    • 12 capacitive sensor ports.
    • Supported Matrix switches. Maximum 36 switches.
    • Automatic self-calibration.
    • Continued touch detection.
    • LED controller with PWM function.
    • Inform the detected result of switch operation by interrupt.
    • 2-wire serial bus interface.
    • 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