wow, good stuff.

Somehow, I felt that freescale has better developing
engineer than LM and MAX. The things from freescale,
are simply more practically useful.

I immediately think of this ele field sensoring
capability is useful in current sensoring. I think
it can be used to build very small and thin current
sensor. Am I right?








----- Original Message -----
From: "Russell McMahon" <rusl@paradise.net.nz>
To: "PIC List" <PICLIST@mit.edu>
Sent: Monday, November 14, 2005 7:38 PM
Subject: [EE] Freescale MC33794 3D e-field imaging IC


> 3D e-field imaging IC.
>
> MC33794 : E-Field sensor for MCU support
>
>
http://www.freescale.com/files/analog/doc/reports_presentations/RMVID3DIMAGI
NG.html
>
> Data sheets and app notes here
>
>
http://www.freescale.com/webapp/sps/site/prod_summary.jsp?code=MC33794&nodeI
d=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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