Abstract: The present invention aims to reduce power consumption in an ADC that performs AD conversion of a single-ended signal. A pair of sampling capacitors samples the single-ended signal. After the single-ended signal has been sampled, the connection control unit performs positive-side connection control of connecting both ends of one of the pair of sampling capacitors across a positive-side signal line and a predetermined ground potential and performs negative-side connection control of connecting both ends of the other of the pair of sampling capacitors across a negative-side signal line and the predetermined ground potential. A conversion unit converts a differential signals from the positive-side signal line and the negative-side signal line that have respectively undergone the positive-side connection control and the negative-side connection control into a digital signal.

Abstract: The present invention aims to reduce power consumption in an ADC that performs AD conversion of a single-ended signal. A pair of sampling capacitors samples the single-ended signal. After the single-ended signal has been sampled, the connection control unit performs positive-side connection control of connecting both ends of one of the pair of sampling capacitors across a positive-side signal line and a predetermined ground potential and performs negative-side connection control of connecting both ends of the other of the pair of sampling capacitors across a negative-side signal line and the predetermined ground potential. A conversion unit converts a differential signals from the positive-side signal line and the negative-side signal line that have respectively undergone the positive-side connection control and the negative-side connection control into a digital signal.

Abstract: There is provided a power supply switching circuit including a first control signal output unit that outputs a signal exceeding a predetermined potential using a main power supply as a first control signal when a power supply voltage of the main power supply exceeds a predetermined reference voltage, a second control signal output unit that outputs the signal exceeding the predetermined potential using a standby power supply from a battery as a second control signal when a potential of the first control signal does not exceed the predetermined potential, and a power supply output unit that outputs the main power supply when the first control signal exceeds the predetermined potential and outputs the standby power supply when the second control signal exceeds the predetermined potential.

Abstract: There is provided a voltage detector including a reference voltage generator that generates a constant reference voltage when a power supply voltage is higher than a predetermined threshold voltage, and a detector that, when the power supply voltage exceeds a voltage that is higher than the threshold voltage by a predetermined potential, detects whether the power supply voltage is higher than a defined voltage based on the reference voltage and outputs a detection result.

Abstract: There is provided a power supply switching circuit including a first control signal output unit that outputs a signal exceeding a predetermined potential using a main power supply as a first control signal when a power supply voltage of the main power supply exceeds a predetermined reference voltage, a second control signal output unit that outputs the signal exceeding the predetermined potential using a standby power supply from a battery as a second control signal when a potential of the first control signal does not exceed the predetermined potential, and a power supply output unit that outputs the main power supply when the first control signal exceeds the predetermined potential and outputs the standby power supply when the second control signal exceeds the predetermined potential

Abstract: There is provided a voltage detector including a reference voltage generator that generates a constant reference voltage when a power supply voltage is higher than a predetermined threshold voltage, and a detector that, when the power supply voltage exceeds a voltage that is higher than the threshold voltage by a predetermined potential, detects whether the power supply voltage is higher than a defined voltage based on the reference voltage and outputs a detection result.

Abstract: A bandgap reference circuit includes: a first PMOSFET connected to a power supply node; a first resistor connected to a drain of the first PMOSFET; a first diode connected to the first resistor and a ground node; a second PMOSFET connected to the power supply node; a second diode connected to a drain of the second PMOSFET and the ground node; a second resistor connected between the first PMOSFET and ground node; a third resistor connected between the second PMOSFET and ground node; a third PMOSFET connected to the power supply node and an output node of a reference voltage; a fourth resistor connected between the third PMOSFET and ground node; and an operational amplifier having a non-inverting input terminal connected to the first PMOSFET and an inverting input terminal connected to the second PMOSFET, an output voltage being applied to each gate of the first to third PMOSFETs.