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Conducted noise is a huge problem for capacitive sensing applications connected to noisy power supplies and can cause the device to false trigger. 60-70% of the capacitive touch products in the market such as appliances, access control panels, and others are required to pass the IEC61000-4-6 certification. In order to help customers with this certification, TI built a reference design with CapTIvate touch technology and had it fully certified for IEC61000-4-6 in a third party lab. This design is available to all customers at ti.com/captivates to use as a reference, while they work to get their product certified. CapTIvate has several features in hardware and software to make it robust to noise and pass this standard. When water falls on a capacitive surface, it can be falsely detected as a touch. CapTIvate technology enables moisture rejection techniques to differentiate touch from moisture making the system more robust. Also, by using metal overlay designs it can be made completely water proof. Emissions are a measurement of the amount of e-field that the capacitive sensors emit in their surroundings, which may cause defective operation of neighboring electronics. CapTIvate technology uses spread spectrum technology in combination with lower voltages to reduce emissions caused by its e-field.
