Product Details Supplier Info More products

Maxim Integrated Products has unveiled touch-interface systems with integrated four-wire touch-screen controllers, haptic controller drivers and infrared-based proximity sensing.

Designed for application flexibility, the Max11810 and Max11811 devices can drive a DC motor directly or piezo elements using an external piezo driver.

The Max11800 and the Max11801 are register-map-compatible versions without haptic controller drivers and proximity sensing.

Through simple register programming, the Max11810 and the Max11811 generate more 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 the system microcontroller.

This programmability simplifies the addition of haptic feedback to any end equipment with a touch screen.

Typical applications include mobile phones, MP3 players, portable media players, digital photo frames, multifunction printers, point-of-sale and financial terminals, barcode 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.

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 and the Max11811 have built-in waveform generators that create the various haptic patterns and provide 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 and the Max11811 eliminate 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 haptic-feedback output of the Max11810 and the Max11811 drives an external high-voltage amplification circuit to which the piezo actuators are connected.

Unlike existing touch-screen controllers, the Max11810/Max11811 and Max11800/Max11801 reduce system power by offering additional digital, on-chip processing to validate touch events before they are sent to the application processor.

This automatic validation reduces the interrupt servicing of false or redundant touch events and lowers total system power.

This capability is said to be crucial for battery-powered end equipment.

The Max11800/Max11801 and Max11810/Max11811 support a built-in dynamic aperture feature (position hysteresis) and on-chip FIFO.

This automatic function reduces latency in the touch response and unnecessary data transfer between the devices and application processor or microcontroller.

Two other touch-screen controllers are part of this device family: the Max11802/Max11803.

These devices are register-map-compatible versions of the Max11800/Max11801 but without the position hysteresis and on-chip FIFO.

The Max11802 and the Max11803 provide standard resistive touch-screen controller functionality.

Available in high-speed (25MHz) SPI and fast (400kHz) I2C versions, these devices guarantee compatibility with virtually any system or application processor.

A 1.7V to 3.6V single-supply operating range eliminates the need for external supply-voltage regulators and level translators on the data bus.

The parts are offered in an extended temperature range (-40C to +85C).

A variant up to +105C is currently being qualified for use in automotive applications.

Maxim Integrated Products

Maxim Integrated Products is a publicly-traded company that designs, manufactures, and sells high-performance semiconductor products. The company was founded over 25 years ago with the mission to deliver innovative analogue and mixed-signal engineering solutions that add value to its customers' products. To date, it has developed over 6,400 products serving the industrial, communications, consumer, and computing markets.

Maxim reported revenue of approximately $2bn (£1.3bn) for fiscal 2010. A Fortune 1000 company, Maxim is included in the Nasdaq 100, the Russell 1000, and the MSCI USA indices. For more information, visit out website.

View full profile