A capacitive touch system including a drive end, a capacitive touch sensing device and a detection end is provided. The drive end inputs a modulated drive signal into an input channel of the capacitive sensing device, wherein the modulated drive signal includes a plurality of driving frequencies. The detection end detects a detection signal of an output channel of the capacitive sensing device and generates a two-dimensional detection vector corresponding to each of the driving frequencies. The capacitive touch system includes a touch panel or a touch keyboard.

A high-sensitivity capacitive sensor circuit having improved sensitivity by implementing a plurality of detection units using charging and discharging, has: an oscillation unit for generating a control clock; a first charge/discharge unit connected to a sensing it electrode, which generates a sensing signal while being charged/discharged according to the control clock; a second charge/discharge unit connected in parallel to the first charge/discharge unit, which generates a reference signal while being charged/discharged according to the control clock; and a detection unit for detecting a change in the capacitance on the side of the sensing unit electrode by comparing the sensing signal from the first charge/discharge unit with the reference signal from the second charge/discharge unit. The first charge/discharge unit includes: a first capacitor connected at one end thereof to the sensing unit electrode, which is charged/discharged according to the control clock; a first constant-current source for supplying a predetermined amount of constant-current to the first capacitor, which charges the first capacitor; and a first switch for controlling the first capacitor such that, according to the control clock, the first capacitor is repetitively charged and discharged every half cycle of the clock. The second charge/discharge unit includes: a second capacitor which is charged/discharged according to the control clock; a second constant-current source for supplying a predetermined amount of constant-current to the second capacitor so as to charge the second capacitor; and a second switch for controlling the second capacitor such that, according to the control clock, the second capacitor is repetitively charged and discharged every half cycle of the clock.

The present disclosure provides a touch detection circuit which comes with additional, new functions, an input device and an electronic apparatus. N first terminals (Ps) are each connected with a corresponding first electrode (Es). A second terminal (Pc) is connected with a second electrode (Ec). N first capacitance detection circuits (210) correspond to the N first terminals (Ps), change voltages of the first terminals (Ps), respectively, and each generate a first detection signal indicating an electrostatic capacitance of the corresponding first electrode (Es) in accordance with movement of a charge produced in the corresponding first terminal (Ps). A cancelling circuit (240) driving the second terminal (Pc) in a manner that a voltage of the second terminal (Pc) follows a voltage of the first terminal (Ps). A second capacitance detection circuit (260) generating a second detection signal indicating an electrostatic capacitance of the second electrode (Ec).

A capacitance detection apparatus and an electronic device are disclosed. The capacitance detection apparatus includes: a sensing module, a connecting circuit, and a differential detection circuit for detecting changes in capacitance of the sensing module; the sensing module comprises: a substrate, and a first sensing layer and a second sensing layer respectively located on two sides of the substrate; a first sensing unit of the first sensing layer is opposite to a second sensing unit of the second sensing layer, and the first sensing unit covers the second sensing unit; the first sensing unit and the second sensing unit are electrically connected to the differential detection circuit. When a detection object approaches the capacitance detection apparatus, the capacitance of the first sensing unit is influenced by the temperature and the detection object, and the capacitance of the second sensing unit is only influenced by the temperature.

A sensing device with a fingerprint sensor is provided. The sensing device includes a touch input pattern included in the fingerprint sensor, an oscillation circuit connected to the touch input pattern and configured to change a capacitance of the oscillation circuit when a touch occurrence is sensed by the touch input pattern and generate an oscillation signal based on the change in the capacitance, and an operation detection circuit configured to detect a touch occurrence based on a frequency included in the oscillation signal input from the oscillation circuit and generate a detection signal.

Electrodes and regions of top plate opposed to electrodes constitute switches that have capacitances varying when the regions of top plate are depressed from top plate toward electrodes. Depression detection circuit calculates the capacitance change amounts of switches indicating changes of the capacitances from a reference value. Depression detection circuit calculates the maximum value and sum of the capacitance change amounts of switches. When the capacitance change amount of at least one switch exceeds threshold and a situation in which the ratio of the maximum value to the sum is equal to or greater than threshold has lasted for the number of repetitions in, depression detection circuit determines that the switch having the maximum value of the capacitance change amount is in a depressed state.

A capacitive sensor includes a switching capacitor circuit, a comparator, and a charge dissipation circuit. The switching capacitor circuit reciprocally couples a sensing capacitor in series with a modulation capacitor during a first switching phase and discharges the sensing capacitor during a second switching phase. The comparator is coupled to compare a voltage potential on the modulation capacitor to a reference and to generate a modulation signal in response. The charge dissipation circuit is coupled to the modulation capacitor to selectively discharge the modulation capacitor in response to the modulation signal.

A presence detection device including a sensor connected to a microcontroller, the sensor including a first detection capacitor arranged in a first detection area, and a second detection capacitor arranged in a second detection area. The microcontroller is configured to recurrently repeat a phase of measuring a measurement signal by charging/discharging the first detection capacitor from/into the second detection capacitor, and to detect a presence of a user in the first detection area and/or the second detection area according to the measurement signal. Also disclosed are a motor vehicle including a detection device and a detection method.

An assembly for connecting a flat body to a voltage supply is presented. The assembly includes a ribbon cable, a control unit, and a connection element. A voltage supply supplies an electric voltage to the control unit. The flat body includes an electrically conductive structure, and a switching surface for generating a control signal that is received by the control unit. According to one aspect, the control unit is embedded in an insulating material between the flat body and the connection element. Also presented is a flat body with such an assembly, as well as a method for producing such an assembly.

A capacitance detection device includes: a variable capacitance capacitor; an electrode constituting a detection target whose capacitance is to be detected; and a control circuit, in which the control circuit executes: manipulation processing of manipulating a capacitance of the variable capacitance capacitor to control an intermediate potential, which is a potential at a connection point between the variable capacitance capacitor and the electrode, to a reference potential, when a voltage of a voltage application device is applied to the electrode via the variable capacitance capacitor; and detection processing of detecting the capacitance of the detection target, based on the capacitance of the variable capacitance capacitor when being controlled to the reference potential.