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Leadis claims first touch controllers with integrated haptics driver

Posted: 27 May 2008 ?? ?Print Version ?Bookmark and Share

Keywords:touch controllers? haptics driver integrated? PureTouch LDS6010 LDS6040?

Leadis Technology Inc. offers samples of the LDS6010 and LDS6040, two new products in the company's family of PureTouch low-power controllers designed for capacitive touch applications. According to the company, the new devices are the world's first capacitive touch controllers with an integrated haptics driver for use with mobile phone touch-input controls including sliders, scroll wheels, and buttons. Both devices carry the "VibeTonz-Ready" designation, certifying compatibility with Immersion Corp.'s VibeTonz advanced haptic platform for mobile phones.

The LDS6010/LDS6040 controllers supports both eccentric rotating mass (ERM) and linear resonant actuator (LRA) vibration motors, enabling flexibility in system design for deploying an advanced haptics platform. A smart watchdog timer monitors the PWM input and sets the haptics driver to shutdown mode to save power if no PWM activity is detected. An integrated over-temperature shutdown protection circuit disables the haptics functionality if the controller temperature exceeds 135C, providing protection against motor failure conditions that might otherwise result in excessive current conditions and system battery drainage.

The LDS6040 also incorporates LED drivers for integrated visual feedback, with up to eight of the 15 touch sensor inputs configurable as keypad LED drivers capable of driving up to 8mA each (16mA available by connecting a single LED to two driver outputs). Sharing the same advanced LED driver architecture as Leadis' previously released controller, the LDS6040 also supports true current control (0.25mA increments) with up to 32 dimming steps, a high-side architecture for enhanced safety and ESD immunity, and host-less activation of an LED when a touch event occurs. The LDS6040's haptics and LED drivers operate within a 3-5V supply range, with a programmable on-board voltage regulator enabling direct connection of the haptics supply to the system battery while still ensuring a consistent haptics experience across the battery discharge curve.

Optimized with a low power touch operating voltage of 1.8V, the LDS6010 and LDS6040 consume less than 200uW in full power mode (haptics in shutdown). Both controllers feature 15 touch sensor inputs.

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