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Sensing Principle of Touch Sensor

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  • Place of Origin :Korea



Sensing principle of Touch Sensor

The left picture illustrates the electric capacity created by human body and surrounding.

The electric capacity created by contact of human body is very small figure (pF) and it is an important technology to perceive precisely very small change of capacitance.

The sensing process of frequency change has been developed to perceive the minute electric capacity changed by human body precisely and quantitatively.

Without contact of human body, T0, the cycle of frequency is changed to T0+T by influence of Cbody added by human body. And it is possible to perceive even very small change with this process.


Features of Capacitive Sensor(Switch)

- Realization of beautiful high-class design
- Good use of space by slim structure
- Semi-permanent lifetime and high reliability
- Reasonable, simple and convenient manufacturing process
- Outstanding application for all kinds of switches

Performance comparison between the General Switch and the Capacitive Sensor

Comparison Basis Existing TACT S/W

Capacitive Sensor


- Can happen malfunction by humidity and accident in case water is gone in switch

- Has danger of static electricity from direct contact of human body and of electric shock in case of internal short circuit in switch

Has no danger of electric shock by humidity, moisture, static electricity, etc. due to touch of object insulated electrically
Durability Happens frequently machinery problem because hard-face of switch is gradually weaken and has weakness to shock Has outstanding hard-face because this is operated by semiconductor, not by machine or mechanical handling
Pollution Control Has possibility of malfunction by pollutant like oil, dust, etc. in knob of switch Has no possibility of pollution because this has no knob or hole in switch and easy to clean
Convenience of Production Need mold or punching work outside product and process to fix switch Reduced drastically process cost because process to fix switch in frame is not necessary
Realization of Design Has limitation of design because knob of switch is exposed outside Has beautiful high-class design by good finish of contact surface only due to internal switch
Convenience Must push switch precisely Convenient to regulate by tickling
Accuracy/Sensitivity Difficult to work precisely by diverse factor as oil, abrasion, etc. Has outstanding and permanent accuracy due to perceive with semiconductor
Application Has diverse limitation factor Can apply to various fields
  Stability Durability Pollution Control Convenience of Production Realization of Design Convenience Accuracy Application
Capacitive Sensor O O O O O O O O
TACT Switch X X X O X X X O

Specification of Capacitive Sensor


The signal of contact is sent to circuit section the minute that the sensor recognizes for exchange value of electric capacity when human body or object with electric capacity is contacted.


  • After power is turned on, capacitive sensor does send high signal in ordinary status and send low signal in contact status.
  • Input volt is 5 volts and consumed about 400μA only
  • Can be utilized with microcomputer without additional circuit with a built-in 5KΩ Pull-up


  • Operation volt: 5 Volts
  • Consumption of Electric current: 400μA (Max.: 500μA)
  • Output of Impedance: High 10 KΩ, Low 10 Ω
  • Sensitivity: Various greatly in 5V VDD (Max 6mm)


  • Enable to apply to sensor for human body or object including general switch
  • Flow meter, Key Pad and Sensor switch of human body

Diversity of application plan

< Used independently in circumstance of 5volt support >

- Possible to utilize connecting with microcomputer without additional circuit in case of key pad of appliances like audio
- Acting as independent ON/OFF switch when serving as Power On/Off

< Used together with electronic AC switch>
Serving as a control switch of AC like Touch Lite

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  • Sensing Principle of Touch Sensor

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Sensing Principle of Touch Sensor

Sensing Principle of Touch Sensor

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Sunil Elecomm Co., Ltd.
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