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Controllers target capacitive touch apps

Posted: 10 Nov 2008     Print Version  Bookmark and Share

Keywords:touch sensor input  low power controllers  capacitive touch 

Leadis Technology Inc. introduced the LDS6003, LDS6005, LDS6023, LDS6025, and LDS6028, the latest members of its PureTouch family of low power controllers designed for capacitive touch applications. Targeted at both mobile and non-mobile applications, the devices support a variety of touch input types including buttons, sliders, and scroll wheels.

According to Leadis, the new products augment the PureTouch portfolio by offering additional choices in the number of touch sensor input channels. The LDS6003 and LDS6005 offer 6 and 10 touch sensor inputs, respectively, providing lower channel options compared with the 15 offered by the LDS6000. The LDS6023, LDS6025, and LDS6028 offer 6, 10, and 15 touch sensor inputs, respectively, with at least half of the channels dual-configurable as either touch sensors or LED drivers. As with the previously introduced 13-channel LDS6020, each LED driver may be associated with an individual touch sensor, enabling closed-loop (no-host) activation of keypad LEDs when a touch event occurs. Smooth visual transitions are facilitated by 32 step dimming at the 8mA maximum current level.

All members of the PureTouch family are optimised for low power operation at 1.8V, consuming less than 200µW in full power mode, enabling implementation of capacitive touch inputs in portable devices without the need for low power modes that introduce first-touch latencies. Integrated features include STS Strongest Touch Selection (STS) to prevent inadvertent touches, Thresholds Individually Programmed (TIP) to empower customers in optimising end-product touch sensitivity according to individual preferences, and Automatic Ambient Compensation (AAC) which automatically optimises touch responsiveness according to environmental changes such as humidity and temperature.

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