QST104 Datasheet, PDF (1/45 Pages) STMicroelectronics – Capacitive touch sensor device 4 keys with individual key state outputs or I2C interface

QST104
Capacitive touch sensor device
4 keys with individual key state outputs or I2C interface
Features
■ Patented charge-transfer design
■ Up to 4 independent QTouch™ keys supported
■ Individual key state outputs or I²C interface
■ Fully “debounced” results
■ Patented AKS™ Adjacent Key Suppression
■ Self-calibration and auto drift compensation
■ Spread-spectrum bursts to reduce EMI
■ Up to 13 general-purpose outputs
■ ECOPACK® (RoHS compliant) package
Applications
This device specifically targets human interfaces
and front panels for a wide range of applications
such as PC peripherals, home entertainment
systems, gaming devices, lighting and appliance
controls, remote controls, etc.
QST devices are designed to replace mechanical
switching/control devices and the reduced
number of moving parts in the end product
provides the following advantages:
■ Lower customer service costs
■ Reduced manufacturing costs
■ Increased product lifetime
LQFP32 (7x7 mm)
Description
The QST104 is the ideal solution for the design of
capacitive touch sensing user interfaces.
Touch-sensitive controls are increasingly
replacing electromechanical switches in home
appliances, consumer and mobile electronics,
and in computers and peripherals. Capacitive
touch controls allow designers to create stylish,
functional, and economical designs which are
highly valued by consumers, often at lower cost
than the electromechanical solutions they
replace.
The QST104 QTouch™ sensor IC is a pure digital
solution based on Quantum's patented charge-
transfer (QProx™) capacitive technology.
QTouch™ and QProx™ are trademarks of the
Quantum Research Group.
Table 1. Device summary
Feature
Order code
QST104KT6
Operating supply voltage 2.4 to 5.5 V
Supported interfaces
Individual key state outputs
or I²C Interface
Operating temperature -40° to +85° C
Package
LQFP32 (7x7 mm)
February 2008
Rev 2
1/45
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