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Optoelectronics/Displays  

Touch controllers operate at low power

Posted: 16 May 2008     Print Version  Bookmark and Share

Keywords:touch controllers  sensor input  LED 

Leadis Technology Inc. introduces its PureTouch family of programmable low-power touch controllers, the LDS6000 and LDS6020, which are designed to support a variety of touch input types including buttons, sliders, and scroll wheels in both mobile and non-mobile applications.

Optimised for low power operation at 1.8V, the LDS6000 and LDS6020 consume less than 200µW in full power mode, enabling implementation of capacitive touch in portable devices without the need for low power modes that introduce latency between the first-touch and system touch recognition. They provide update rates of 2ms per sensor input with on-chip automatic calibration logic continuously monitoring the environment to adjust ambient baseline levels, increasing touch accuracy. Both SPI- and I²C-compatible interfaces are supported with a GPIO and interrupt output for additional communication with the host processor. They are packaged in a 4mm x 4mm 28ld TQFN package with maximum thickness of 0.8mm.

Unique offerings
The LDS6000 features 15 touch sensor inputs, while the LDS6020 offers 13 touch sensor inputs with integrated keypad LED driver functionality.

Eight of the 13 sensor inputs are configurable as LED drivers capable of driving up to 8mA of current, with 16mA available for a single LED by connecting to two LED drivers simultaneously. True current control in 0.25mA increments insures high LED-to-LED brightness consistency, with up to 32 dimming steps that enable smooth transitions between the on and off states. A high-side LED driver architecture allows for isolation from the system battery and a common cathode LED connection to system ground, improving system reliability and ESD performance compared to low-side architectures. Each LED driver may be associated with a different touch sensor input, allowing for automatic, host-less activation of an LED when a touch event occurs.





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