Analogue, Mixed Signal, LSI


Resistive touchscreen controller

20 January 2010 Analogue, Mixed Signal, LSI

The SX8650 from Semtech is a low-power 4-wire resistive touchscreen controller with enhanced ±15 kV electrostatic discharge (ESD) protection. It supports the 400 kHz fast-mode I²C serial bus data protocol and has an operating voltage from 1,65 V to 3,7 V. It features a highly accurate 12-bit analog-to-digital converter for coordinates and touch pressure measurement, and is able to achieve an equivalent throughput output rate of 50 kSps. With current consumption as low as 23 μA at 8 kSps rate and the ability to enter low power states automatically between conversions, this controller is well suited for portable and battery powered touchscreen devices. The device incorporates a dedicated hardware/RESET pin, a built-in preprocessing algorithm for data averaging that reduces bus loading, as well as on-chip programmable settling time capability.



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