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US 2016/0110023 A1Published application
Semiconductor device with touch sensor circuit
AssigneeRenesas Electronics Corporation
InventorMasahiro Araki
Life of this patent
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Abstract
A semiconductor device includes a terminal to which a touch electrode may be coupled; a source voltage drop circuit generating a constant voltage; a phase shift circuit generating a phase shifted clock in response to a first clock and a phase control signal; and a switching circuit to which the constant voltage is supplied. The switching circuit generates drive pulses for applying the constant voltage to the terminal in response to the phase shifted clock. The phase shift circuit varies the phase of the drive pulses based on the phase control signal.
Claims5
A semiconductor device comprising:
- a terminal to which a touch electrode may be coupled;
- a first capacitor which is coupled to the touch electrode and an insulating film;
- a second capacitor which is coupled to the touch electrode and a ground voltage;
- a source voltage drop circuit which generates a constant voltage;
- a phase shift circuit which generates a phase shifted clock in response to a first clock and a phase control signal;
- and
- a switching circuit to which the constant voltage is supplied;
- wherein the switching circuit generates a drive pulse for applying the constant voltage to the terminal in response to the phase shifted clock, and
- wherein the phase shift circuit varies the phase of the drive pulse based on the phase control signal.
6 more elements
Dependencies are inferred from the claim text.