Electrode device, semiconductor device, and semiconductor system

A semiconductor device comprising:

• an electrode device including:
• a receiver electrode;
• a first transmitter electrode disposed to face the receiver electrode;
• a second transmitter electrode disposed to face the receiver electrode with the first transmitter electrode interposed therebetween;
• a dielectric substrate to fix a distance and a dielectric constant between the first transmitter electrode and the second transmitter electrode, the dielectric substrate being provided between the first transmitter electrode and the second transmitter electrode,
• a pulse signal output circuit configured to output a pulse signal selectively to any of the first transmitter electrode and the second transmitter electrode,
• a capacitance detection circuit that calculates a change in capacitance between the first transmitter electrode and the receiver electrode based on a first consumption current consumed by the receiver electrode when the pulse signal is applied to the first transmitter electrode, and a second consumption current consumed by the receiver electrode when the pulse signal is applied only to the second transmitter electrode;
• and
• an arithmetic processing unit that determines whether a detected target has been disposed on the electrode device based on a detection result by the capacitance detection circuit.

A semiconductor system comprising:

• an electrode device;
• and
• a semiconductor device,
• wherein the electrode device includes:
• a receiver electrode;
• a first transmitter electrode disposed opposite to the receiver electrode;
• a second transmitter electrode disposed opposite to the receiver electrode with the first transmitter electrode interposed therebetween;
• and
• a dielectric substrate for fixing a distance and dielectric constant between the first transmitter electrode and the second transmitter electrode,
• wherein the semiconductor device includes:
• a pulse signal output circuit for outputting a pulse signal selectively to any of the first transmitter electrode and the second transmitter electrode;
• a capacitance detection circuit for calculating an amount of change of capacitance between the first transmitter electrode and the receiver electrode, based on a first current consumed in the receiver electrode when the pulse signal is applied to the first transmitter electrode, and a second current consumed in the receiver electrode when the pulse signal is applied only to the second transmitter electrode
• an arithmetic processing unit for determining whether or not an object to be detected is disposed on the electrode device, based on a detection result by the capacitance detection circuit.