3D e-field imaging IC.

MC33794 : E-Field sensor for MCU support

        http://www.freescale.com/files/analog/doc/reports_presentations/RMVID3DIMAGING.html

Data sheets and app notes here

    http://www.freescale.com/webapp/sps/site/prod_summary.jsp?code=MC33794&nodeId=0143597973b9G0&tid=tahs3D

The MC33794 is intended for applications where non-contact sensing of 
objects is desired. It contains circuitry necessary to generate a low level 
electric field and measure the field loading caused by objects moved into 
the field. The MC33794 is intended for use in detecting objects in an 
electric field associated with an electrode. The IC generates a low 
frequency sine wave. The frequency is adjustable by using an external 
resistor and is optimized for 125 kHz. The sine wave has very low harmonic 
content to avoid the generation of harmonic interference. The internal 
generator produces a nominal 5.0 V peak-to-peak output which is passed 
through an internal resistor of about 22kOhm. The MC33794 contains support 
circuits for an MCU to allow the construction of a 2 chip E-field system.



Ref: Ken Mardle

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