Capacitance is an amazingly accurate way to measure everything from physical contact to length or pressure. While capacitance sensors typically require a fair amount of circuitry, we now have one in a single IC with an I2C digital interface. Make tactile switches obsolete!

Features:

  - Accuracy: 4 fF (yes femto)

  - Linearity: 0.01%

  - Common-mode (not changing) capacitance up to 17 pF

  - Full-scale (changing) capacitance range: ±4 pF

  - Tolerant of parasitic capacitance to ground up to 60 pF

  - Update rate: 10 Hz to 90 Hz

  - Simultaneous 50 Hz and 60 Hz rejection at 16 Hz

  - Temperature sensor on-chip
  - Resolution: 0.1°C, accuracy: ±2°C

  - Voltage input channel

  - Internal clock oscillator

  - 2-wire serial interface (I2C®-compatible)

  - Power
  - 2.7 V to 5.25 V single-supply operation
  - 0.7 mA current consumption

  - Operating temperature: –40°C to +125°C

  - 16-lead TSSOP package