TI FDC2214RGHT

Capacitive sensing is a low-power, high-resolution, non-contact sensing technology suitable for a wide range of applications including proximity detection, gesture recognition, and remote liquid level sensing. Sensors in a capacitive sensing system can be implemented using any metal or conductor, enabling highly flexible system designs.

The primary limitation on sensitivity in capacitive sensing applications is the noise susceptibility of the sensor. The FDC2x1x employs a resonance-based sensing architecture that maintains consistent performance even in fluorescent environments.

The FDC2x1x is a multichannel family of high-resolution, high-speed capacitance-to-digital converters designed for implementing capacitive sensing solutions. This family uses an innovative narrowband-based architecture that provides high rejection of out-of-band noise while delivering high resolution at high speeds. The devices support a wide excitation frequency range, offering flexibility in system design. This wide frequency range is particularly useful for reliable detection of conductive liquids such as detergents, soapy water, and inks.

The FDC221x is optimized for resolutions up to 28 bits, while the FDC211x supports sampling rates up to 13.3kSPS, making it well-suited for applications involving high-speed moving targets. A maximum input capacitance of 250nF supports the use of remote sensors and enables tracking of environmental changes over time, such as temperature and humidity variations.

The FDC2x1x family is suitable for proximity detection and liquid level sensing applications across various fluid types. For non-conductive liquid level sensing applications where interference sources such as human hands may be present, the FDC1004 with an integrated active shield driver is recommended.

• EMI-resistant architecture
• Maximum output rate (single active channel):
  • 13.3kSPS (FDC2112, FDC2114)
  • 4.08kSPS (FDC2212, FDC2214)
• Maximum input capacitance: 250nF (at 10kHz, using 1mH inductor)
• Sensor excitation frequency: 10kHz to 10MHz
• Number of channels: 2, 4
• Resolution: up to 28-bit
• System noise floor: 0.3fF (at 100SPS)
• Supply voltage: 2.7V to 3.6V
• Power consumption:
  • Active: 2.1mA
  • Low-power sleep mode: 35μA
  • Shutdown: 200nA
• Interface: 1℃
• Temperature range: -40℃ to +125℃

• Proximity sensor
• Gesture recognition
• Liquid level sensing (including conductive liquids such as detergent, soap solution, and ink)