8 capacitance sensing input channels with sensitivity up to 150 mm
Integrated automatic functionality for capacitance optimization

OnSemiconductor has introduced a new touch/proximity sensing solution integrated on a single chip.

The LC717A30UJ is a wide-range capacitance-to-digital converter that uses mutual capacitance to detect changes down to the femtofarad (fF) level. The parasitic capacitance cancellation function raises the sensitivity of the noise rejection detector as the built-in noise elimination mechanism handles electrostatic interference (EMI) effects.

OnSemiconductor has optimized the LC717A3UJ, which features 8 capacitance sensing input channels, for use in systems requiring switch arrays. This device is a total solution that integrates an input channel selector, ADC, dual-stage amplifier, and various control logic functions that determine capacitance changes, analog amplitude values, system clock, and power-on reset circuit. I2C and SPI interfaces are selectable according to system application requirements.



This device has a sensitivity range of 150 mm, which is higher than competing products, providing sensitive gesture operation and touch functionality. Additionally, since it operates with an air gap between the sensor/PCB and protective cover, engineers can proceed with assembly processes without light guides. The integrated automatic functionality for capacitance optimization also accelerates the system development cycle and stabilizes field operation.

The LC717A3UJ complies with AEC-Q100 to support requirements for automotive applications such as vehicle entry systems and instrument panel control. With its high integration level and wide dynamic range, it is used in touch and gesture human interfaces for industrial consumer products such as induction cookers, refrigerators, home entertainment systems, building automation equipment, industrial equipment, and lighting control.