Abstract: Described herein is a car entertainment and navigation system that includes a user interface controller, a detecting circuit, and a selection circuit. The detecting circuit includes a selection circuit, capacitance-sensing circuitry to determine a location of a touch proximate to one or more electrodes of the touch screen display based on capacitance measurements of a plurality of electrodes of the touch screen made during a first mode of operation of the detecting circuit, and user-detecting circuitry to determine a location of a user corresponding to the touch based on signal measurements of a capacitively-coupled signal at the one or more electrodes made during a second mode of operation of the detecting circuit. The selection circuit is configurable to selectively couple the capacitance-sensing circuitry to the plurality of electrodes during the first mode and selectively coupling the user-detecting circuitry to the one or more electrodes during the second mode.

Abstract: The present invention provides a circuit for supplying a verifying reference and measurement voltage for use in verifying the programming of a programmable cell. The present invention provides the verifying reference and measurement voltage through internal circuitry on the cell and eliminate any requirement for an externally provided reference voltage. The verifying voltage is provided by modifying the programming voltage. The programming voltage is stepped down or stepped up through the use of internal circuitry to provide the reference and measurement voltage.