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The MC33794 is intended for applications where noncontact sensing of objects is desired. When connected to external electrodes, an electric field is created.,The MC33794 is intended for use in detecting objects in this electric field. The IC generates a low-frequency sine wave. The frequency is adjustable by using an external resistor and is optimized for 120 kHz. The sine wave has very low harmonic content to reduce harmonic interference.

The MC33794 also contains support circuits for a microcontroller unit (MCU) to allow the construction of a two-chip E-field system.

Features

? Supports up to 9 Electrodes and 2 References or Electrodes

? Shield Driver for Driving Remote Electrodes Through Coaxial Cables

? +5.0 V Regulator to Power External Circuit

? ISO-9141 Physical Layer Interface

? Lamp Driver Output

? Watchdog and Power-ON Reset Timer

? Critical Internal Nodes Scaled and Selectable for Measurement

? High-Purity Sine Wave Generator Tunable with External Resistor

Typical Applications

? Occupant Detection Systems

? Appliance Control Panels and Touch Sensors

? Linear and Rotational Sliders

? Spill Over Flow Sensing Measurement

? Refrigeration Frost Sensing

? Industrial Control and Safety Systems Security

? Proximity Detection for Wake-Up Features

? Touch Screens

? Garage Door Safety Sensing

? Liquid Level Sensing