BU21050FS is a capacitive sensor controller with 8 channels. The IC has a port interface and is easy to replace the switch point with this controller.
The BU21050FS is a capacitive sensor control IC featuring eight sensor channels, a 5 V supply, and integrated 10‑bit A/D conversion. It offers configurable output modes (8‑bit PIO or 4‑bit binary) and includes built‑in noise filtering, calibration, and shutdown functions.
The document provides absolute maximum ratings, recommended operating conditions, detailed pin descriptions, block diagrams, and ordering information, along with application notes for home appliances and other electronic devices.
| Number of sensor channels | 8 |
|---|---|
| Supply voltage | 5 V |
| ADC resolution | 10‑bit |
| Package | SSOP‑A32 |
| Operating temperature range | -40 °C to 85 °C |
| Power dissipation | 760 mW |
| Applied voltage (AVDD) | -0.3 V to 7.0 V |
The IC can output either an 8‑bit PIO mode or a 4‑bit binary mode.
The device supports eight sensor inputs, selected one‑by‑one.
DVDD should be applied first or both AVDD and DVDD can be applied simultaneously.