Freescale Semiconductor,inc.

Gabriel Sanchez Barba

Bradley C Stewart

Sergio Garcia De Alba Garcin

David L Wilson

Rogelio Reyna Garcia

An electric field sensor may be used to detect accumulation of frozen material. In one embodiment, an e-field system includes a first electrode, a second electrode located at a distance from the first electrode, the second electrode forming a capacitive element with the first electrode, wherein a gap is present between the first and second electrodes, and an electric field sensor having an electrode terminal coupled to the first electrode and providing an electric field output value representative of an amount of frozen material located in the gap between the first and second electrodes. The system may also include a first insulator adjacent the first electrode and outside the gap, and a conductive layer adjacent the first insulator, where the first insulator is between the first electrode and the conductive layer, and where a shield output of the electric field sensor is coupled to the conductive layer.

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Jalisco, Mexico

Gabriel Sanchez Barba