Abstract: A charge-pump control circuit includes an oscillator which supplies a clock for driving a charge pump driver to supply a first gate voltage to a discharging transistor in order to control discharge from a battery, and driving a charge pump driver to supply a second gate voltage to a charging transistor in order to control charge to the battery, respectively; and a drive control circuit which sets a control target voltage as one of the first gate voltage and the second gate voltage having a lower voltage in order to control generation of the clock by the oscillator according to the control target voltage.

Abstract: Provided is a technology capable of protecting a charge/discharge control circuit and a battery device from a reverse connection state without a separately provided protection circuit. The charge/discharge control circuit to be contained in a battery device including a secondary cell, an external positive terminal and an external negative terminal, and FETs which control charging and discharging of the secondary cell, respectively, includes: VDD and VSS terminals; a charge control terminal; a discharge control terminal; a voltage detection terminal to which a voltage applied to the external positive terminal is supplied; an NMOS transistor communicates the discharge control terminal and the voltage detection terminal; and a bipolar transistor having a collector to be connected to a drain of the NMOS transistor, an emitter to be connected to a source of the NMOS transistor, and a base to be connected to a bulk of the NMOS transistor and the VSS terminal.

Abstract: Provided is a technology capable of protecting a charge/discharge control circuit and a battery device from a reverse connection state without a separately provided protection circuit. The charge/discharge control circuit to be contained in a battery device including a secondary cell, an external positive terminal and an external negative terminal, and FETs which control charging and discharging of the secondary cell, respectively, includes: VDD and VSS terminals; a charge control terminal; a discharge control terminal; a voltage detection terminal to which a voltage applied to the external positive terminal is supplied; an NMOS transistor communicates the discharge control terminal and the voltage detection terminal; and a bipolar transistor having a collector to be connected to a drain of the NMOS transistor, an emitter to be connected to a source of the NMOS transistor, and a base to be connected to a bulk of the NMOS transistor and the VSS terminal.

Abstract: A charge-pump control circuit includes an oscillator which supplies a clock for driving a charge pump driver to supply a first gate voltage to a discharging transistor in order to control discharge from a battery, and driving a charge pump driver to supply a second gate voltage to a charging transistor in order to control charge to the battery, respectively; and a drive control circuit which sets a control target voltage as one of the first gate voltage and the second gate voltage having a lower voltage in order to control generation of the clock by the oscillator according to the control target voltage.

Abstract: Provided is a two-terminal semiconductor sensor device with which an external device having low circuit or element accuracy may be used. An output voltage (VOUT) of the two-terminal semiconductor sensor device based on temperature is not based on a constant current of a constant current source (70) of the external device and a current of an output transistor (60) of the two-terminal semiconductor sensor device, but on a resistance ratio of a voltage dividing circuit including a resistor (30) and a resistor (40), and a temperature voltage (Vbe) of the two-terminal semiconductor sensor device. Accordingly, accuracy of the constant current of the constant current source (70) of the external device that receives the output voltage (VOUT) does not need to be high. Therefore, the external device does not need to have a highly accurate circuit or element for receiving the output voltage (VOUT).

Abstract: To provide a PDM output temperature sensor, which is reduced in area and consumption power, provided is a PDM output temperature sensor which includes no reference voltage circuit, thereby having a smaller area and consuming less power correspondingly.

Abstract: To provide a PDM output temperature sensor, which is reduced in area and consumption power, provided is a PDM output temperature sensor which includes no reference voltage circuit, thereby having a smaller area and consuming less power correspondingly.

Abstract: Provided is a temperature compensating circuit, which conducts a temperature correction having a continuous characteristic, and is small in the circuit scale. An output voltage VOUT at a connection point 14 is determined on the basis of a current Ia2, a current Ib2, and a current Ic2, and an output voltage of a temperature sensor circuit is corrected by the output voltage VOUT with a temperature. As a result, the temperature correction having the continuous characteristic is conducted on the basis of a current change of the current Ia2, the current Ib2, and the current Ic2. Because the plural temperature compensating circuits are not provided, and only one temperature compensating circuit is provided, the circuit scale becomes smaller.

Abstract: Provided is a two-terminal semiconductor sensor device with which an external device having low circuit or element accuracy may be used. An output voltage (VOUT) of the two-terminal semiconductor sensor device based on temperature is not based on a constant current of a constant current source (70) of the external device and a current of an output transistor (60) of the two-terminal semiconductor sensor device, but on a resistance ratio of a voltage dividing circuit including a resistor (30) and a resistor (40), and a temperature voltage (Vbe) of the two-terminal semiconductor sensor device. Accordingly, accuracy of the constant current of the constant current source (70) of the external device that receives the output voltage (VOUT) does not need to be high. Therefore, the external device does not need to have a highly accurate circuit or element for receiving the output voltage (VOUT).

Abstract: Provided is a chopper amplifier circuit capable of eliminating an influence of a slew rate of an amplifier and suppressing spike generation to thereby obtain an output signal having little harmonic distortion. The chopper amplifier circuit according to the present invention includes: a first chopper circuit for chopping an input signal by a first pulse and a second pulse shifted from each other in phase by a half cycle, switching a relation of connection between an input terminal pair and an output terminal pair at a timing of the chopping, and outputting the input signal as a modulated signal; an amplifier for amplifying the modulated signal and outputting the modulated signal thus amplified as an amplified signal; a first sample hold circuit for holding the amplified signal at the first pulse and outputting the amplified signal at the second pulse; and a second sample hold circuit for holding the amplified signal at the second pulse and outputting the amplified signal at the first pulse.

Abstract: Provided is a chopper amplifier circuit capable of reducing an offset voltage of a sensor bridge and temperature characteristics of the offset voltage. An offset adjusting voltage generation circuit for generating a voltage equal to an offset voltage of a sensor bridge and an offset temperature characteristics adjusting voltage generation circuit for generating a voltage having temperature characteristics equal to those of the offset voltage are provided. These output voltages are chopper-modulated and subtracted from a chopper-modulated output signal of the sensor bridge.

Abstract: Provided is a temperature compensating circuit, which conducts a temperature correction having a continuous characteristic, and is small in the circuit scale. An output voltage VOUT at a connection point 14 is determined on the basis of a current Ia2, a current Ib2, and a current Ic2, and an output voltage of a temperature sensor circuit is corrected by the output voltage VOUT with a temperature. As a result, the temperature correction having the continuous characteristic is conducted on the basis of a current change of the current Ia2, the current Ib2, and the current Ic2. Because the plural temperature compensating circuits are not provided, and only one temperature compensating circuit is provided, the circuit scale becomes smaller.

Abstract: Provided is a chopper amplifier circuit capable of eliminating an influence of a slew rate of an amplifier and suppressing spike generation to thereby obtain an output signal having little harmonic distortion. The chopper amplifier circuit according to the present invention includes: a first chopper circuit for chopping an input signal by a first pulse and a second pulse shifted from each other in phase by a half cycle, switching a relation of connection between an input terminal pair and an output terminal pair at a timing of the chopping, and outputting the input signal as a modulated signal; an amplifier for amplifying the modulated signal and outputting the modulated signal thus amplified as an amplified signal; a first sample hold circuit for holding the amplified signal at the first pulse and outputting the amplified signal at the second pulse; and a second sample hold circuit for holding the amplified signal at the second pulse and outputting the amplified signal at the first pulse.

Abstract: Provided is a chopper amplifier circuit capable of reducing an offset voltage of a sensor bridge and temperature characteristics of the offset voltage. An offset adjusting voltage generation circuit for generating a voltage equal to an offset voltage of a sensor bridge and an offset temperature characteristics adjusting voltage generation circuit for generating a voltage having temperature characteristics equal to those of the offset voltage are provided. These output voltages are chopper-modulated and subtracted from a chopper-modulated output signal of the sensor bridge.