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Touchscreen controller achieves 50KSps throughput

Posted: 06 Nov 2009 ?? ?Print Version ?Bookmark and Share

Keywords:touchscreen controller? I²2 bus? ESD protection?

SX8650 touchscreen controller

Semtech Corp. has introduced the SX8650, an ultralow-power four-wire resistive touchscreen controller with enhanced 15kV ESD protection. The SX8650 is the first in a new platform of touchscreen controllers and claims to be optimized for power (23?A), size (1.46mm x 1.96mm), and ESD protection. It is suited for applications such as mobile phones, digital still cameras, MP3 players, PDAs, personal navigation devices and handheld gaming devices.

The SX8650 supports the 400kHz fast-mode I2C serial bus data protocol and has an operating voltage from 1.65V to 3.7V. It features a highly accurate 12bit ADC for coordinates and touch pressure measurement, and is able to achieve an equivalent throughput output rate of 50KSps. 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-wire resistive touchscreen devices. The SX8650 is a complete touchscreen solution incorporating a dedicated hardware/RESET pin, a built-in preprocessing algorithm for data averaging that greatly reduces bus loading and further minimizes the overall system power budget, as well as on-chip programmable settling time capability to optimize the throughput rates for a vast variety of touch panel designs.

"The SX8650 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 (HBM) and IEC 61000-4-2 standards, thus eliminating the need for external transient voltage suppression devices while minimizing cost and board space," said Sam Massih, product line manager, consumer analog products for Semtech. "Coupled with the extremely low operating current and tiny footprint, this makes Semtech's SX8650 the premier solution for today's portable touch-sensing devices."

The SX8650 is available is available in production quantities in both a 3mm x 3mm 12-DFN and 1.46mm x 1.96mm 12-WLCSP space-saving packages and is guaranteed to operate over the extended (-40C to +85C) temperature range. It is priced at $0.76 for DFN packages and $0.78 for WLCSP packages in 3,000-piece lots.

For application notes on touchscreen controllers click here.

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