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Five-wire touchscreen controller packs SPI interface

Posted: 14 Jun 2010 ?? ?Print Version ?Bookmark and Share

Keywords:touchscreen controller? SPI? interface? ESD?

SX8652 touchscreen controller

Semtech Corp. is rolling out the SX8652, an ultralow power four- or five-wire resistive touchscreen controller with an SPI interface.

The SX8652 is one of a new generation of touchscreen controllers that are optimized for low-power consumption (23?A), small size (1.46mm x 1.96mm chip-scale package), and high ESD protection (15kV). The SX8652 is an application-specific resistive touchscreen controller tailored for applications including PDAs, digital still cameras, point-of-sales terminals, printers and other portable touchscreen monitor devices.

The SX8652 supports the 5MHz SPI serial interface protocol and has an operating voltage range of 1.65V to 3.7V. It features a highly accurate 12bit ADC for coordinates and touch pressure measurement and can achieve an equivalent throughput output rate of 74KSps. With current consumption as low as 23?A at 8KSps and the ability to enter low-power states automatically between conversions, this controller is a suitable choice for portable and battery-powered four- or five-wire resistive touchscreen devices. The SX8652 is a complete touchscreen solution incorporating a dedicated hardware/RESET pin, a built-in preprocessing algorithm for data averaging to significantly reduce bus loading and the overall system power budget, and an on-chip programmable settling time feature which can be used to optimize the throughput rates for a wide array of touch panel designs.

"The SX8652 addresses the field returns issue prevalent in touchscreen applications due to destructive ESD events. Each analog input was specifically designed to enable robust ESD protection up to 15kV in both human body model and IEC 61000-4-2 standards, eliminating the need for external ESD protection while minimizing cost and board space," said Sam Massih, product line manager, consumer analog products for Semtech. "This, coupled with the extremely low operating current and tiny footprint makes Semtech's SX8652 the premier solution for today's four- and five-wire resistive touchscreen applications."

The SX8652 is available in 1.5mm x 2mm 12-WLCSP and 4mm x 3mm 14-DFN space-saving packages and is guaranteed to operate over the extended (-40C to +85C) temperature range. The new device joins Semtech's recently introduced SX8650 four-wire, I?C resistive touchscreen controller.

The SX8652 is available in production quantities and is priced at $0.76 for 14-DFN (4mm x 3mm packages) and $0.78 for WLCSP packages (1.5mm x 2mm 12-WLCSP) in 1,000-piece lots. Semtech offers comprehensive design assistance, including field- and factory-based support.

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