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Capacitive Sensing

Capacitive Sensing
Capacitive Sensing
Product Code : FDC1004-Q1
Product Description

Overview for Capacitive Sensing

Capacitive sensing is a high resolution, low cost, contactless sensing technique that can be applied to a variety of applications such as liquid level sensing, proximity sensing, gesture recognition, ice/rain detection, and collision avoidance.

The sensor in a capacitive sensing system is any conductor, such as copper on PCB, conductive ink, or a piece of metal, allowing for low-cost and highly-flexible system design. This conductor acts as a proximity sensor or liquid level sensor depending on the use case.

Getting started with capacitive sensing

Key benefits of TI capacitive sensing technology

  • TI's out of phase level sensing is unique in the industry and minimizes the impact of external interferers such as human hands that introduce measurement errors in capacitance sensing systems
  • Large input offset allows compensation of environmental variables such as temperature and humidity in addition to allowing remote sensing capabilities
  • Large shield drive minimizes EMI interference, focuses sensing direction, and reduces the effects of humidity and temperature changes
  • High resolution allows for distance object sensing with a small, inexpensive conductive sensor

Highlights of capacitive sensing technology

  • Strong reliability: Offers contactless sensing that eliminates mechanical wear
  • Great flexibility: Sensor size and shape can adapt to system geometry
  • Low system cost: Uses low cost sensors, either a piece of metal already existing in the system or a small, two-layer copper on PCB or a pressed foil or a copper tape or a conductive ink
  • High sensitivity: Sensitive to both conductive and non-conductive materials

Application notes

 

Using capacitive sensing for liquid level sensing

Capacitive sensing has gained popularity as a liquid level sensor due to the accuracy and resolution of the measurements as well as the simplicity, flexibility, and low cost of the sensor design.

Learn more

  • Capacitive-based liquid level sensing

Application notes

  • Out-of-phase liquid level technique (PDF, 600KB)
  • Ice buildup detection using TI's capacitive sensor (PDF, 4.9MB
  •  Using capacitive sensing for proximity sensing Capacitive sensing can be used as a low cost, flexible solution for a number of proximity sensing applications such as proximity wakeup in thermostats, appliances, and consumer goods; collision avoidance in industrial and automotive doors; and kick sensors and keyless entry in automotive doors.

    Capacitive-based human proximity detection for system wake-up & interruptBacklight and Smart lighting control by ambient light and proximity

    Automotive Capacitive Proximity Kick to Open Detection

    Reference Design Application notes

    Capacitive proximity sensing using the FDC1004 (PDF, 1.





Bagmane Tech Park, C.V. Raman Nagar, Byasandra, Bengaluru - 560093, Karnataka, India
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