Toradex QT60040 overview
Quantum Research Group QT60040 4-Key Charge-Transfer IC Creates 4 "touch buttons" through any dielectric Only 1 inexpensive capacitor required Simple 4x1 matrix...
Product details
Manufactured byToradex
Product group4-Key Charge-Transfer ICs
DescriptionQuantum Research Group QT60040 4-Key Charge-Transfer IC
Key FeaturesCreates 4 "touch buttons" through any dielectric Only 1 inexpensive capacitor required Simple 4x1 matrix key geometry 100% drift compensation for lifetime reliability "2" key rollover: senses any 2 keys at same time Back-lit keys possible with ITO electrodes Simple direct "per key" active-high drive outputs Auto recalibration after 10 or 60 seconds of touch 2.5 - 5.5V single power supply operation CMOS design - very low power consumption 14-pin SOIC package E604 Evaluation reference design board available
Typical ApplicationsAutomotive controls PC / peripheral controls ATM machines Touch-screens Appliance controls Vandal-proof keypads Security keypanels Industrial keyboards
OverviewThe QT60040 digital charge-transfer (“QT”) QMatrix™ IC is designed to detect touch on up to 4 keys in a scanned 4x1 matrix. It will project the keys through almost any dielectric, like glass, plastic, stone, ceramic, and even most kinds of wood, up to thicknesses of 6mm. The touch areas are defined as simple 2-part interdigitated electrodes of conductive material, like copper, Indium-Tin-Oxide (ITO), or screened silver or carbon deposited on the rear of a control panel. Alternatively the keys can be implemented on a stick-on flex circuit that can be adhered to the rear of most panels.The IC is designed specifically for domestic appliances, computer and peripheral control buttons, ATM machines, security panels, portable instruments, machine tools, or similar products that are subject to environmental challenges or physical attack. It permits the construction of 100% sealed, watertight keypanels that are immune to environmental factors such as humidity and condensation, temperature, dirt accumulation, or the physical deterioration of the panel surface from abrasion, chemicals, or abuse. The QT60040 contains Quantum-pioneered self-calibration, drift compensation, and digital filtering algorithms that make its sensing function extremely robust and survivable.The device can easily control keys over graphical LCD panels or LEDs when used with clear, conductive ITO electrodes. It does not require 'chip on glass' or other exotic fabrication techniques, thus allowing the OEM to source the keymatrix from multiple vendors.External circuitry consists only of a single, inexpensive capacitor. The sensitivity of the keys can be set by simply changing the value of this capacitor. The device has 4 outputs which indicate detection on the keys; up to 2 keys can be sensed at any one time.The QT60040 features automatic recalibration timeouts which will cause the device to recalibrate keys on an individual basis when they are 'stuck on' for intervals of either 10s or 60s, depending on a jumper option.QT60040 technology makes use of an important new variant of charge-transfer sensing, transverse charge-transfer, in an XY format that minimizes the number of required scan lines and external components. Unlike older technologies it does not require one IC per key, and is cost competitive even with some rubber membrane technologies. A distinct advantage is an accelerated time to market due to the fact that custom molded membranes are not required; the entire system can be designed using common PCB materials.
Manufacturer, product group, and supply
See who makes this product, where it belongs, and where available inventory may be listed.
Manufactured by
Toradex
View Toradex profile
Product group
4-Key Charge-Transfer ICs
Explore 4-Key Charge-Transfer ICs
Available from
Sourcing support available
Start a sourcing request