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New tech rolls for capacitive touch apps

Posted: 01 Dec 2008     Print Version  Bookmark and Share

Keywords:capacitive touch  touch zones  button ICs  sensor array 

Leadis Technology Inc. has unveiled the TapTouch technology, a solution that lowers the cost of capacitive touch implementation in high button count applications. This new technology supports up to 56 independent touch zones with a single 15-channel IC, enabling the integration of large numbers of capacitive touch buttons while keeping system cost and power consumption low.

TapTouch extends the capabilities of the company's LDS60xx family of button ICs to allow product manufacturers to efficiently implement touch technology into high button count applications. Such applications include remote control and telephony applications, where many buttons are inherently required for device operation. Leadis' solution may also be used in screen applications—such as mobile handsets and handheld games—where functions such as icon selection and gesture recognition are desired.

TapTouch leverages a two-layer sensor array that allows each sensor to support multiple touch zones, often eliminating the need for multiple touch controllers. It also reduces experience-inhibiting first-touch latency by enabling continuous scanning of touch zones without the high power consumption typically associated with low- or no-latency implementations.

TapTouch supports icon selection and gesture-recognition functions without the need for a more expensive full-resolution touchscreen controller. In addition, the solution is compatible with Leadis' integrated LED driver and haptics driver controller offerings.

TapTouch uses a two-tiered sensor structure, enabling multiple touch zones to share a single sensor input. By interpreting which two sensor lines have been activated, the host processor can determine which unique zone has been touched. Leadis provides reference host code for touch zone determination that may be adapted for a variety of different TapTouch configurations and applications.

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