Touchkeys

• Acceleration
• Ambient Light
• Angular rate
• Distance
• Pressure
• Touchkeys
• Touchpanels
• UV-Sensor

Elatec represents Quantum Research Group that develops and markets capacitive sensor ICs for switching and control applications based on its patented charge-transfer (QT) capacitive sensing technology which is more stable and more accurate than other types of capacitive switching and has a dynamic range of several decades. It involves charging a sense electrode - which can be anything electrically conductive - then transferring that charge to a detector comprised of another known capacitor. The charge transfer acquisition process is carried out in burst mode using microprocessor-controlled switching of MOSFET transistors. The presence of external capacitance caused by an object such as a finger affects the flow of charge to permit sensing.

Spread-spectrum sensing mode uses sparse, randomized charging pulses with long delays between bursts. Individual pulses can be as short as 5% or less of the intra-burst pulse spacing. The benefits of this spread-spectrum approach include lower cross-sensor interference, reduced RF emissions and susceptibility, and very low power consumption