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Touch-interface systems pack haptic controller

Posted: 03 Aug 2009 ?? ?Print Version ?Bookmark and Share

Keywords:haptic controller? touch-interface? touchscreen? microcontroller?

MAX11810/11 touch-interface

Maxim Integrated Products has developed the MAX11810 and MAX11811, the first touch-interface systems with integrated 4-wire touchscreen controllers, haptic controller drivers, and IR-based proximity sensing.

Designed for applications flexibility, these devices can drive a DC motor directly or piezo elements using an external piezo driver. The MAX11800 and MAX11801 are register-map-compatible versions without haptic controller drivers and proximity sensing.

Through simple register programming, the MAX11810/11 generates greater than 50,000 different haptic patterns with a built-in haptic waveform generator. Programmable registers eliminate the need for a dedicated interface on the application processor or system microcontroller. This programmability simplifies the addition of haptic feedback to any end equipment with a touchscreen.

Target applications include cellphones, MP3 players, portable media players, digital photo frames, multifunction printers, point-of-sale and financial terminals, bar code-scanners, card readers, and other industrial equipment. Automotive-qualified part versions exist for use in car GPS, entertainment head units, and rear-seat entertainment systems.

Haptic feedback
The current market solution for haptic feedback using motors requires the application processor/system microcontroller to drive the motor. The applications processor/microcontroller needs to generate the haptic waveforms and send them to the motor through a dedicated interface. This adds latency and engages the application processor/microcontroller continuously, not allowing it to perform other duties.

The MAX11810/11 has a built-in waveform generator that creates the various haptic patterns and provides a direct interface to the motors. This approach eliminates the need for a dedicated interface on the application processor/microcontroller. With an integrated H-bridge driver, the MAX11810/11 eliminates the need for an external amplifier when haptic feedback is implemented using a DC motor. Alternatively, if piezo elements are used to implement haptics, the MAX11810/11's haptic-feedback output drives an external high-voltage amplification circuit to which the piezo actuators are connected.

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