Abstract: A touch device and an operation method for the touch device are provided. The touch device includes touch keys, controllers, and a processing circuit. The controllers group selected touch keys among the touch keys into at least one touch key group. Each of the at least one touch key group includes at least two selected touch keys. When the selected touch keys of a first touch key group among the at least one touch key group are simultaneously touched, the processing circuit sequentially provides touch driving signals to the first touch key group and receives touch sensing signal groups corresponding to the touch driving signals. When the touch sensing signal groups all indicate that the selected touch keys of the first touch key group are simultaneously touched, the processing circuit determines that the touch on the first touch key group is a valid touch.

Abstract: A touch device and an operation method for the touch device are provided. The touch device includes touch keys, controllers, and a processing circuit. The controllers group selected touch keys among the touch keys into at least one touch key group. Each of the at least one touch key group includes at least two selected touch keys. When the selected touch keys of a first touch key group among the at least one touch key group are simultaneously touched, the processing circuit sequentially provides touch driving signals to the first touch key group and receives touch sensing signal groups corresponding to the touch driving signals. When the touch sensing signal groups all indicate that the selected touch keys of the first touch key group are simultaneously touched, the processing circuit determines that the touch on the first touch key group is a valid touch.

Abstract: A touch detection circuit detects whether a key is being touched and includes a comparator, a compensation capacitor, and a voltage control circuit. The comparator includes an inverting input, a non-inverting input, and an output terminal. The compensation capacitor is coupled to the inverting input. The voltage control circuit provides an output voltage to the non-inverting input. In a calibration mode, the voltage control circuit adjusts the output voltage according to the voltage level of the output terminal.

Abstract: A touch system includes a processor and a touch array. The touch array includes touch units. Each of the touch units includes a driving electrode, a first sensing electrode, and a second sensing electrode. A first capacitor is formed between the first sensing electrode and the driving electrode. A second capacitor is formed between the second sensing electrode and the driving electrode. The processor is configured to: determine whether the touch array operates in an underwater mode according to the first original capacitance value and the second original capacitance value; determine whether a conductor touch event occurs according to a first threshold value and a voltage across the first capacitor when the touch array operates in the underwater mode; and determine whether a non-conductor touch event occurs according to a second threshold value and a voltage across the second capacitor when the touch array operates in the underwater mode.

Abstract: A touch system includes a processor and a touch array. The touch array includes touch units. Each of the touch units includes a driving electrode, a first sensing electrode, and a second sensing electrode. A first capacitor is formed between the first sensing electrode and the driving electrode. A second capacitor is formed between the second sensing electrode and the driving electrode. The processor is configured to: determine whether the touch array operates in an underwater mode according to the first original capacitance value and the second original capacitance value; determine whether a conductor touch event occurs according to a first threshold value and a voltage across the first capacitor when the touch array operates in the underwater mode; and determine whether a non-conductor touch event occurs according to a second threshold value and a voltage across the second capacitor when the touch array operates in the underwater mode.