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Leadis launches PureTouch low-power controllers

Posted: 16 May 2008 ?? ?Print Version ?Bookmark and Share

Keywords:PureTouch? programmable low-power touch controllers? capacitive touch applications?

Leadis Technology Inc. has announced sampling availability of the first two products in its PureTouch family of programmable low-power touch controllers designed for capacitive touch applications. The LDS6000 and LDS6020 controllers support a variety of touch input types including buttons, sliders and scroll wheels in both mobile and non-mobile applications.

Optimized for low power operation at 1.8V, the LDS6000 and LDS6020 consume less than 200?W 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 to increase touch accuracy. Both SPI- and I?C-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 enabling 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.

The LDS6000 is a programmable touch controller for use with capacitive sensor arrays implementing touch-based input controls including sliders, scroll wheels, and buttons. Featuring 15 sensor inputs, the LDS6000 provides fast update rates of 2ms per sensor input with on-chip automatic calibration logic continuously monitoring the environment to adjust ambient baseline levels to increase touch accuracy.

More features
The LDS6000 operates with a 1.8V supply voltage and consumes less than 200?W in full power mode. Both SPI-compatible and I?C-compatible interfaces are supported with a GPIO and interrupt output for additional communication with the host processor. The LDS6000 is packaged in a 4mm x 4mm 28ld TQFN package with maximum thickness of 0.8mm.

The LDS6020 is a programmable touch controller with integrated keypad LED drivers for use with capacitive sensor arrays implementing touch-based input controls including sliders, scroll wheels, and buttons. Featuring 13 sensor inputs, the LDS6020 provides fast update rates of 2ms per sensor input with on-chip automatic calibration logic continuously monitoring the environment to adjust ambient baseline levels to increase touch accuracy.

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. LED dimming may be configured over various transition times, with 32 dimming steps available at maximum current drive. Automatic activation of LED with a valid touch event is achieved by associating an LED driver to a sensor input, alleviating the need for the host processor to turn on the LED.

The device operates with a 1.8V supply voltage and consumes less than 200?W in full power mode. Both SPI-compatible and I?C-compatible interfaces are supported with a GPIO and interrupt output for additional communication with the host processor. The LDS6020 is packaged in a 4mm x 4mm 28ld TQFN package with maximum thickness of 0.8mm.





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