Abstract: A touch-screen interface circuit configured to operate in at least three modes comprises a first resistive x-plate having at least a first x-terminal connected in the first mode to a voltage supply and a second x-terminal connected in first mode to circuit ground; a voltage regulator circuit comprising a floating reference voltage source connected in first mode to the second x-terminal, and to a first input of a touch-screen reference buffer circuit having a second input connected in first mode to the first x-terminal; the voltage regulator circuit arranged to control in first mode a connection between the voltage supply and the first x-terminal; and a second resistive y-plate having at least a first y-terminal and being arranged to apply a wiper contact to the first x-plate, the wiper contact having an x-position, y-position and pressure.

Abstract: A power management arrangement for a mobile device comprising a digital circuit block and an analog circuit block, the power management arrangement being arranged to supply a first voltage to the analog circuit and a second voltage to the digital circuit, the power management arrangement comprising: an input unit adapted to receive input voltages from a plurality of power sources; a first voltage regulator coupled to the input unit and for supplying the first voltage; a second voltage regulator for supplying the second voltage and arranged to be selectively coupled to one of the first voltage regulator and input unit; and control logic adapted to select which of the received input voltages from the plurality of power sources provides power to the first and second voltage regulators, and to determine the magnitude of the first and second voltages supplied by the first and second voltage regulators.

Abstract: A touch-screen interface circuit configured to operate in at least three modes comprises a first resistive x-plate having at least a first x-terminal connected in the first mode to a voltage supply and a second x-terminal connected in first mode to circuit ground; a voltage regulator circuit comprising a floating reference voltage source connected in first mode to the second x-terminal, and to a first input of a touch-screen reference buffer circuit having a second input connected in first mode to the first x-terminal; the voltage regulator circuit arranged to control in first mode a connection between the voltage supply and the first x-terminal; and a second resistive y-plate having at least a first y-terminal and being arranged to apply a wiper contact to the first x-plate, the wiper contact having an x-position, y-position and pressure.

Abstract: A power management arrangement for a mobile device comprising a digital circuit block and an analog circuit block, the power management arrangement being arranged to supply a first voltage to the analog circuit and a second voltage to the digital circuit, the power management arrangement comprising: an input unit adapted to receive input voltages from a plurality of power sources; a first voltage regulator coupled to the input unit and for supplying the first voltage; a second voltage regulator for supplying the second voltage and arranged to be selectively coupled to one of the first voltage regulator and input unit; and control logic adapted to select which of the received input voltages from the plurality of power sources provides power to the first and second voltage regulators, and to determine the magnitude of the first and second voltages supplied by the first and second voltage regulators.