文档介绍：Freescale Semiconductor Document Number: MC33794
Technical Data Rev 9, 11/2006
Electric Field Imaging Device
The MC33794 is intended for applications where noncontact sensing of
objects is desired. When connected to external electrodes, an electric field is MC33794
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) ELECTRIC FIELD
to allow the construction of a two-chip E-field system. IMAGING DEVICE
Features
• Supports up to 9 Electrodes and 2 References or Electrodes
• Shield Driver for Driving Remote Electrodes Through Coaxial Cables
•+ 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 EK SUFFIX
• High-Purity Sine Wave Generator Tunable with External Resistor 54-LEAD SOICW-EP
CASE 1390-02
Typical Applications
• Occupant Detection Systems
• Appliance Control Panels and Touch Sensors
• Linear and Rotational Sliders
• Spill Over Flow Sensing Measurement
• Refrigeration F