Seiko Epson Corporation

Shinnosuke Kano

Atsushi Kiyohara

Mihiro Nonoyama

Shigenori Isozaki

A circuit device according to the embodiment includes an oscillation circuit, a current supply circuit, a counter circuit, and a calculation circuit. An oscillation frequency of the oscillation circuit changes according to a supply current. The current supply circuit supplies, to the oscillation circuit, a first current that changes according to a detection target voltage. The counter circuit performs a count process of counting an output signal of the oscillation circuit in a given period. The calculation circuit performs a voltage calculation process of calculating detection voltage data corresponding to the detection target voltage based on a first count value obtained in the count process in a state in which the first current is supplied to the oscillation circuit.

Circuit device and oscillator

A circuit device has a first mode in which the circuit device outputs a clock signal and a second mode in which the circuit device does not output the clock signal. The circuit device includes an oscillation circuit, a non-volatile memory in which characteristic adjustment data of the oscillation circuit is stored, a reset circuit generating a reset signal, and a storage circuit into which the characteristic adjustment data is loaded from the non-volatile memory when the reset signal transitions from active to inactive. When the circuit device shifts from the second mode to the first mode, the reset circuit causes the reset signal to transition from active to inactive.

Circuit device, oscillator, electronic apparatus, and vehicle

A circuit device includes an A/D conversion circuit that performs an A/D conversion of a temperature detection voltage, a digital filter that performs digital filter processing of A/D output temperature detection data, a selector that selects A/D output temperature detection data during an activation period and selects filter output temperature detection data during a normal operation period after the activation period, a digital signal processing circuit that outputs frequency control data of an oscillation frequency based on selector output temperature detection data, and an oscillation signal generation circuit that generates an oscillation signal of an oscillation frequency set by frequency control data.

A circuit device includes a D/A converter, a comparator that compares a temperature detection voltage from a temperature sensor unit with a D/A conversion voltage from the D/A converter, and a processing circuit that executes a determination process based on a comparison result from the comparator, and obtains temperature detection data as a result of A/D conversion of the temperature detection voltage, in which, the processing circuit determines the temperature detection data so that a change in the temperature detection data at a second output timing following a first output timing with respect to the temperature detection data at the first output timing is equal to or less than k&#xd7;LSB.

Circuit device, oscillator, electronic apparatus, and moving object

A circuit device includes an A/D converter that converts a temperature detection voltage from a temperature sensor unit to temperature detection data, and a digital signal processing circuit that executes a temperature compensation process based on the temperature detection data. The A/D converter, in an activation period, may execute a first A/D conversion process to obtain an initial value of the temperature detection data, and in a normal operation period, may execute a second A/D conversion process based on the initial value to obtain the temperature detection data.

A circuit device includes an A/D conversion circuit that performs A/D conversion on a temperature detection voltage from a temperature sensor so as to output temperature detection data, and a digital signal processing circuit that performs a temperature compensation process on the basis of the temperature detection data, in which the A/D conversion circuit operates in a first mode, and switches to a second mode in a case where a predetermined condition is established.

Circuit device, oscillator, electronic apparatus, vehicle, and manufacturing method for circuit device

A circuit device includes a register that stores result data, a D/A converter that executes D/A conversion on the result data so as to output a D/A conversion voltage, a comparator that compares an input voltage with the D/A conversion voltage, and a processing circuit that executes an update process on the result data through a determination process based on a comparison result from the comparison portion, so as to obtain A/D conversion result data of the input voltage, in which the processing circuit executes the determination process on an MSB side of the A/D conversion result data in a first determination period, and executes the determination process on an LSB side of the A/D conversion result data in a second determination period longer than the first determination period.

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Minowa, Japan

Shinnosuke Kano