Thursday, 21 March 2019

Self-Capacitance vs Mutual-Capacitance

What's the difference?

Self-capacitance measures the absolute sensor capacitance where the mutual-capacitance measures the interaction between two electrodes.

What are the benefits of Self-Capacitance?



The self-capacitance offers a simple sensor design and can be used in a range of design shapes such as round, heart and rectangular. This method is ideal for 15 touch keys and below as each sensor needs its own connection to a controller IC.

What are the benefits of Mutual-Capacitance?



Unlike the self-capacitance, the mutual-capacitance method has a complex sensor design. The double ITO layer, or crossings in silver tracks, lends it sophistication to the needs of a higher number of touch keys. As  result of this method, the mutual capacitance is deemed 'good' for water resistance. Mutual-capacitance also enables a multi touch feature which allows gesture recognition such as pinch, zoom and rotate.

Which method is best suited for my business requirements?

While the mutual-capacitance is mainly used for touchscreens, the self-capacitance is used for smaller, less complex products such as individual buttons and sliders.

To find out how SCHURTER Electronics can help find your business solution, email our team today or visit our website.