BU21051FS is a capacitive sensor controller with 2 channels. The IC has a port interface and is easy to replace the switch point with this controller.
The BU21051FS is a capacitive sensor control IC featuring a port output interface, two GPIO channels, and an integrated 10‑bit A/D converter. It operates from a 5 V supply and is packaged in an SSOP‑A16 form factor, making it suitable for a variety of home appliance applications.
The device includes configurable gain, filter selection, and threshold settings, and supports detection, calibration, and shutdown modes. Electrical specifications such as supply voltage range, power dissipation, and oscillator frequency are provided for reliable integration into designs.
| Supply voltage (AVDD) range | -0.3 V to 7.0 V |
|---|---|
| Power dissipation | 500 mW |
| ADC resolution | 10 bit |
| Oscillation frequency | 0.9 MHz to 2.5 MHz |
| Package | SSOP‑A16 |
The recommended operating voltage is 4.5 V to 5.5 V for both AVDD and DVDD.
The BU21051FS provides two GPIO channels.
The SDN pin is a shutdown input; a low level shuts down the IC, while a high level enables normal operation.
The device operates from –40 °C to 85 °C.