The AT42QT1040-MMH is a digital burst mode, charge-transfer (QT™) Capacitive Sensor Driver, designed for touch-key applications. It can sense from one to four keys-one to three keys can be disabled by not installing their respective sense capacitors. The device includes all signal processing functions necessary to provide stable sensing under a wide variety of changing conditions. The outputs are fully debounced. Only a few external parts are required for operation. The device modulates its bursts in a spread-spectrum fashion in order to heavily suppress the effects of external noise and to suppress RF emissions.
● Up to 4 QTouch® keys
● 4 Discrete outputs indicating individual key touch
● Patented spread-spectrum charge-transfer (direct mode)
● Simple self-capacitance style
● Etched copper, silver, carbon, indium tin-oxide (ITO)
● PCB, FPCB, plastic films, glass electrode substrates
● Plastic, glass, composites, painted surfaces panel
● Up to 10mm glass, 5mm plastic panel
● Fixed key threshold, sensitivity adjusted via sample capacitor value key sensitivity
● Adjacent key suppression
●Stress rating only and functional operation of the device at these or other conditions beyond those indicated in the operational sections of this specification is not implied.
