The LC717A30UJ uses mutual capacitance to detect capacitance changes down to femtofarad (fF) levels.
With the increasing demand for touch technology for consumer electronics as well as non-consumer ones, ON Semiconductor has released LC717A30UJ capacitance-to-digital converter that targets touch/proximity sensors.
With eight capacitance-sensing input channels, it is widely used in systems that need an array of switches. The device includes an integrated multiplexer for input channel selection, analog-to-digital converter, dual-stage amplifie
The LC717A30UJ uses mutual capacitance to detect capacitance changes down to femtofarad (fF) levels. The device’s parasitic capacitance cancellation raises the detector sensitivity, while its built-in noise rejection mechanism combats the effects of EMI.
The device’s sensitivity of 150mm enables gesture motions. In addition, it is capable of operating with an air gap between the sensor/PCB and the protective cover – so engineers can eliminate the inclusion of a light guide from the assembly. This device also includes an integrated automatic calibration function which optimises and self-calibrates total capacitance according to the electrode, line capacitance and the surrounding environment, thus accelerating system development cycle time.
The LC717A30UJ has a response time of 16ms for its eight sensing channels and runs off a 2.6V to 5.5V supply with power standby mode of 2μA. To support the needs of automotive applications such as vehicle entry systems and dashboard controls, the device is AEC-Q100 compliant. It can also be employed in a range of touch or gesture human interfaces in industrial and consumer end products such as induction cookers, refrigerators, home entertainment systems, building automation equipment, industrial equipment and lighting controls.