For an optimized response to the environment, use NXP capacitive proximity sensors for detection and self-calibration. The sensors compensate for changes, such as varying humidity or contamination on the electrode.
Sensors
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NXP Capacitive & Proximity Sensor...

Capacitive proximity sensor and switch
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PCF8885TS
Capacitive 8-channel proximity switch with auto-calibration and very low power consumption
Key features and benefits
- Detects capacitance changes on a remote sensing plate
- Proximity operation possible, no contact required
- Changes in the static capacitance are automatically compensated through continuous auto-calibration
- Operates when wearing gloves
- Sensing plate and the IC can be separated by a distance of several metres
- Useable with dirt on the touch area
- Adjustable sensitivity
- Works with any event that generates a pre-defined change in capacitance
- Adjustable response time
Key applications
- Mobile phones or portable entertainment units
- Medical applications
- Explosive environments
- Vandal proofing
- Under upholstery, handles, mats, glass, carpets, tiles etc.
Related links
Application note
- Water and condensation safe touch sensing with the NXP capacitive touch sensors (pdf) (v.2.0, 2012-02-08)
Data sheet
- Capacitive 8-channel proximity switch with auto-calibration and very low power consumption (pdf) (v.1.0, 2011-11-24)
- Dual channel capacitive proximity switch with auto-calibration and large voltage operating range (pdf) (v.1.0, 2011-11-23)
White paper
- Improving Proximity and Touch Interfaces: Capacitive Sensors with Auto-Calibration (pdf) (v.1.0, 2011-10-12)
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Descriptive summary
Compared to alternative switches and sensors, capacitive options have a number of advantages. Resistance-based sensing relies on contact, but capacitive sensors can switch without contact due to proximity sensing. And without the need for foil on the switching area, materials costs are reduced.
Products
| Type number | Description | Status | Quick access |
|---|---|---|---|
| PCA8885TS | Capacitive 8-channel proximity switch with auto-calibration and very low power consumption | Download datasheet Order sample | |
| PCA8886TS | Dual channel capacitive proximity switch with auto-calibration and large voltage operating range | Download datasheet Order sample | |
| PCF8883T | Capacitive proximity switch with auto-calibration, large voltage operating range and very low power consumption | Download datasheet Order sample Buy online | |
| PCF8885TS | Capacitive 8-channel proximity switch with auto-calibration and very low power consumption | Download datasheet Order sample Buy online |






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