Abstract: A semiconductor integrated circuit includes an integrating circuit comprising a variable resistance, an integration capacitance and an amplifier; a switched capacitor connected with the amplifier in parallel to the variable resistance; and an adjusting circuit configured to adjust a resistance value of the variable resistance. The integrating circuit generates a control signal of a voltage based on a first time constant determined based on the resistance value of the variable resistance and a capacitance value of the integration capacitance, and a second time constant determined based on a capacitance value of the switched capacitor and the capacitance value of the integration capacitance. The adjusting circuit adjusts the resistance value of the variable resistance based on the control signal.

Abstract: An A/D conversion apparatus for converting an analog signal into a digital signal includes a successive approximation A/D converter receiving the analog signal and outputting high-order data of the digital signal, a flash A/D converter receiving the analog signal and outputting low-order data of the digital signal, and a coupling circuit coupling the high-order data and the low-order data and outputting the digital signal.

Abstract: An A/D conversion apparatus for converting an analog signal into a digital signal includes a successive approximation A/D converter receiving the analog signal and outputting high-order data of the digital signal, a flash A/D converter receiving the analog signal and outputting low-order data of the digital signal, and a coupling circuit coupling the high-order data and the low-order data and outputting the digital signal.

Abstract: A passenger detection system is presented so that the master control circuit in the system instructs the passenger airbag control circuit controlling the operation of the airbag designated for the passenger seat to be in the deployable state or not-deployable state, depending on the seating conditions of a passenger sitting on the passenger seat, for example whether the passenger is an adult or a child.

Abstract: The present invention provides a phase locked loop circuit comprising: a frequency divider for frequency-diving an output signal to generate frequency-divided pulses; an oscillator for generating the output signal under control to an oscillation frequency by a control voltage obtained from a signal corresponding to a phase difference between the frequency-divided pulses and a reference frequency signal; and a controller for performing such a control that plural kinds of frequency dividing rate are switched to be given to the frequency divider for every time period having a predetermined number of the frequency divided pulses, and at a boundary of switching the plural kinds of frequency dividing rate, the plural kinds of frequency dividing rate are given co-existentially to the frequency divider, and further for switching the coexistent plural kinds of the frequency-dividing rate, the next frequency dividing rate is given before a first appearance of a frequency peak in a transitional characteristic of the fre

Abstract: A passenger detection system is presented so that the master control circuit in the system instructs the passenger airbag control circuit controlling the operation of the airbag designated for the passenger seat to be in the deployable state or not-deployable state, depending on the seating conditions of a passenger sitting on the passenger seat, for example whether the passenger is an adult or a child.

Abstract: A passenger detection system is presented so that the master control circuit in the system instructs the passenger airbag control circuit controlling the operation of the airbag designated for the passenger seat to be in the deployable state or not-deployable state, depending on the seating conditions of a passenger sitting on the passenger seat, for example whether the passenger is an adult or a child.

Abstract: A passenger detecting system includes an antenna electrode, a signal generating circuit, a detecting circuit, and a control circuit. The antenna electrode is provided in a seat to be occupied by a passenger. The signal generating circuit generates and supplies a supply signal to the antenna electrode through a resistor such that an electric field is generated around the antenna electrode. The detecting circuit includes the resistor, and detects a direct current data signal from a line voltage associated with a voltage drop across the resistor, wherein the line voltage changes depending upon an object on the seat. The control circuit determines from the detected direct current data signal, whether or not a passenger is present in the seat and whether the passenger is an adult or a child.

Abstract: The present invention provides a phase locked loop circuit comprising: a frequency divider for frequency-diving an output signal to generate frequency-divided pulses ; an oscillator for generating the output signal under control to an oscillation frequency by a control voltage obtained from a signal corresponding to a phase difference between the frequency-divided pulses and a reference frequency signal; and a controller for performing such a control that plural kinds of frequency dividing rate are switched to be given to the frequency divider for every time period having a predetermined number of the frequency divided pulses, and at a boundary of switching the plural kinds of frequency dividing rate, the plural kinds of frequency dividing rate are given co-existentially to the frequency divider, and further for switching the coexistent plural kinds of the frequency-dividing rate, the next frequency dividing rate is given before a first appearance of a frequency peak in a transitional characteristic of the fr

Abstract: A passenger detection system for precisely detecting the sitting condition of a passenger occupying a seat, who leans against the seat supporting section, and for suitably controlling the deployment/non-deployment of the side airbag based on the results of the detection process. The system comprises a seat having a seat supporting section in which an antenna electrode is provided; a voltage generation device for generating a high-frequency and low-voltage signal which induces a weak electric field around the antenna electrode; a current detection section for detecting a current which flows according to the generated weak electric field; and a control circuit for detecting a leaning condition of the passenger against the seat supporting section, based on a signal output from the current detection section; and an airbag apparatus including a side airbag unit positioned close to a door, the apparatus having a function of deploying the side airbag unit when a collision occurs.