QST508AB0 datasheet(5/51 Pages) STMICROELECTRONICS

5 / 51 page

QST108

Device overview

5/51

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 be 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.

In order to meet environmental requirements, ST offers this device in ECOPACK®

packages. These packages have a lead-free second level interconnect. The category of

second level interconnect is marked on the package and on the inner box label, in

compliance with JEDEC Standard JESD97.

The maximum ratings related to soldering conditions are also marked on the inner box label.

ECOPACK is an ST trademark. ECOPACK specifications are available at: www.st.com.

QST508AB0 Fiches technique(PDF) 5 Page - STMicroelectronics