QST108 datasheet(4/38 Pages) STMICROELECTRONICS

Part #	QST108

Description	Capacitive touch sensor device 8 keys with individual key state outputs or I2C interface

PDF	38 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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4 / 38 page

Device overview

QST108

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Device overview

The QST108 capacitive touch sensor IC is a pure digital solution based on Quantum's

patented charge-transfer (QProx™) capacitive technology.

This technology allows users to create simple touch panel sensing electrode interfaces for

conventional or flexible printed circuit boards (PCB/FPCB). Sensing electrodes are part of

the PCB layout (copper pattern or printed conductive ink) and may used in various shapes

(circle, rectangular, etc.).

By implementing the QProx™ charge-transfer algorithm, the QST108 detects finger

presence (human touch) near electrodes behind a dielectric (glass, plastic, wood, etc.). Only

one external sampling capacitor by channel is used in the measuring circuitry to control the

detection.

QST technology also incorporates advanced processing techniques such as drift

compensation, auto-calibration, noise filtering, and Quantum's patented Adjacent Key

Suppression (AKS) to ensure maximum usability and control integrity.

QST108 Datasheet(PDF) 4 Page - STMicroelectronics