Quantum's latest 2-button and 4-button touch sensors
Quantum Research Group has introduced the QTouch QT220 and QT240 charge-transfer digital sensor chips, which cost approximately 15 cents per button in mass-consumer applications (for reference only). The chip offers manufacturers with human-machine interfaces a similar price to electromechanical switches.
These buttons feature the ability to sense or touch on two or four electrodes, and the electrodes reflect the signal of the individual sensing areas, including glass, plastic, stone, ceramic or wood, from any medium. This IC also converts metal objects into sensors that respond to proximity sensing or touch.
Typical applications include control panels, appliances, gaming consoles, lighting controls, or any other application that requires mechanical switches or buttons. These buttons can also be used in some material sensing and control applications. The touch-sensitive buttons have no movable components, so the reliability of the sensing can be ensured, and the components can be completely sealed within the operation panel, making the device more reliable than similar electromechanical devices.
Each button channel operates completely independently of the other buttons, and each button can be adjusted to a specific sensitivity level by simply changing the value of the sampling capacitor. The device supports two rates, one of which typically consumes only 90μA at 4V. Both devices operate from a single 3.9V to 5.5VDC supply and are available in a 20-pin SSOP lead-free package.
The QT220 and QT240 have a SYNC pin that is used to synchronize with other QT ICs and/or an external source to suppress interference. Another use of this pin is as a driver pin for spread spectrum modulation. The device also provides selectable pins that allow for different timing and feature settings. The RISC core in the device uses signal processing techniques such as "sensor deadlock" conditions, component aging, moisture, and signal drift. Compared to capacitive sensors, the device incorporates spread-spectrum modulation for high EMC compatibility.
These buttons feature the ability to sense or touch on two or four electrodes, and the electrodes reflect the signal of the individual sensing areas, including glass, plastic, stone, ceramic or wood, from any medium. This IC also converts metal objects into sensors that respond to proximity sensing or touch.
Typical applications include control panels, appliances, gaming consoles, lighting controls, or any other application that requires mechanical switches or buttons. These buttons can also be used in some material sensing and control applications. The touch-sensitive buttons have no movable components, so the reliability of the sensing can be ensured, and the components can be completely sealed within the operation panel, making the device more reliable than similar electromechanical devices.
Each button channel operates completely independently of the other buttons, and each button can be adjusted to a specific sensitivity level by simply changing the value of the sampling capacitor. The device supports two rates, one of which typically consumes only 90μA at 4V. Both devices operate from a single 3.9V to 5.5VDC supply and are available in a 20-pin SSOP lead-free package.
The QT220 and QT240 have a SYNC pin that is used to synchronize with other QT ICs and/or an external source to suppress interference. Another use of this pin is as a driver pin for spread spectrum modulation. The device also provides selectable pins that allow for different timing and feature settings. The RISC core in the device uses signal processing techniques such as "sensor deadlock" conditions, component aging, moisture, and signal drift. Compared to capacitive sensors, the device incorporates spread-spectrum modulation for high EMC compatibility.
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