QST104 Datasheet | STMicroelectronics

.. 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 pensation Spread-spectrum bursts to reduce EMI Up to 13 general-purpose outputs ECOPACK® (Ro HS pliant) package 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 puters 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 chargetransfer (QProx™) capacitive technology. QTouch™ and QProx™ are trademarks of the Quantum Research Group. Table 1. Device summary Order code Feature QST104KT6 Operating supply voltage 2.4 to 5.5 V Supported interfaces Operating temperature Package Individual key state outputs or I2C Interface -40° to +85° C LQFP32 (7x7 mm) 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 February 2008 Rev 2 1/45 .st. 1 Contents .. Contents 1 2 3 Device overview . ....