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Semtech expands multi-touch support for 4D-Touch platform to enhance the user experience

Semtech expands multi-touch support for 4D-Touch platform to enhance the user experience

New Products |
By eeNews Europe



The SX867X family is part of Semtech’s 4D-Touch platform of ultra low power controllers that are packed with innovative features such as long-distance proximity detection and advanced haptics driver support in a small footprint. They also feature robust ±15 kV ESD protection making them ideal for a wide variety of applications such as mobile phone, tablet, DSC, handheld GPS, IP phones, printers, automotive center consoles and POS terminals.

4D-Touch devices also feature a highly accurate 12-bit analog-to-digital converter for coordinates and touch pressure measurement with current consumption as little as 0.4 uA at standby. They can enter a low power state between conversions to reduce power consumption, making them ideal for portable applications. Unlike other touchscreen controllers the SX867X devices do not require expensive matrix type resistive panel for multi-touch operation. The proprietary touch-sensing circuitry in the SX867X devices is capable of supporting various common multi-touch gestures such as pinch, stretch and rotation on any 4-wire analog resistive touch screen.

SX867X devices also support a proximity detection distance of more than 5 cm using any standard 4/5-wire resistive panel, enabling various power-saving features such as automatic backlight dimming or system wake-up when the hand approaches the panel. Unlike traditional IR solutions that require additional, costly components for proximity detection, this new generation of resistive touch screen controllers enables proximity detection with zero external components.

A haptics motor driver is incorporated on-chip for controlling linear resonant actuator (LRA) and eccentric rotating mass (ERM) micro motors (up to 250 mA) while providing acknowledgement to touch events, thus emulating the tactile feedback similar to mechanical keys which enhances the overall user experience. Immersion Corp. has certified the SX8677 and SX8678 as optimal motor drivers for its TouchSense 3000 software suite of haptic waveforms available to all customers via an Immersion license. Semtech’s pin-compatible SX865X controllers have the same features except multi-touch gesture recognition allowing manufacturers to develop multiple versions of a product using the same board design.

The SX8674/75/76/77/78 devices which are all offered in space-saving 2.07 mm x 2.07 mm 19-WLCSP as well as 4 mm x 4 mm 20-QFN packages while the touch only version SX8651 and SX8653 come in a small 1.46 mm x 1.96 mm 12- WLCSP and 3 mm x 3 mm 12-DFN (4 mm x 3 mm 14-DFN for SX8653). Semtech guarantees all of these devices to operate over the extended (-40 to +85°C) temperature range.

Availability and Pricing

The SX8651/53/74/75/76/77/78 devices are available in production quantities and come in WLCSP and QFN/DFN packages. Per unit pricing (10,000-unit volume) ranges from $0.88 for the SX8651 to $1.62 for the SX8677.

Visit Semtech at www.semtech.com/info

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