Circuit device, oscillator, real-time clock device, electronic device, and vehicle

A circuit device comprising:

• an oscillation circuit that includes a variable capacitance circuit configured by a capacitor array and oscillates at an oscillation frequency corresponding to a capacitance value of the variable capacitance circuit;
• a processing circuit to which temperature data obtained by A/D converting a temperature detection voltage from a temperature sensor is input and that performs capacitance control on the variable capacitance circuit based on the temperature data, wherein
• the processing circuit receives first temperature data as the temperature data and second temperature data subsequent to the first temperature data and switches first capacitance control data corresponding to the first temperature data and second capacitance control data different from the first capacitance control data in a time-division manner in a period between a start of capacitance control based on the first temperature data and a start of capacitance control based on the second temperature data to be output to the variable capacitance circuit;
• and
• a memory that stores time-division pattern information, wherein
• the processing circuit switches the first capacitance control data and the second capacitance control data in a time-division manner based on the time-division pattern information read from the memory to be output to the variable capacitance circuit.

A real-time clock device comprising:

• a temperature sensor that generates a temperature detection voltage;
• an A/D conversion circuit that generates temperature data by A/D converting the temperature detection voltage;
• an oscillation circuit that includes a variable capacitance circuit configured by a capacitor array and oscillates at an oscillation frequency corresponding to a capacitance value of the variable capacitance circuit;
• a memory that stores a capacitance adjustment value corresponding to the temperature data;
• a processing circuit that controls the capacitance value of the variable capacitance circuit based on the temperature data and the capacitance adjustment value;
• and
• a clocking circuit that generates time information based on a clock signal output from the oscillator circuit, wherein
• the capacitor array includes a plurality of capacitors and a switching switch that is coupled to one of the plurality of capacitors, and
• the processing circuit controls the capacitance value of the variable capacitance circuit with a resolution smaller than a minimum capacitance value of the plurality of capacitors by controlling the switching switch in a time-division manner.