TEMPERATURE MEASURING CIRCUIT, INTEGRATED CIRCUIT, AND TEMPERATURE MEASURING METHOD

• Main Author: MATSUZAKI TOMOKAZU
• Format: Patent
• Language: English; Japanese
• Published: 22.03.2018
• Subjects: AUTOMATIC CONTROL, STARTING, SYNCHRONISATION, OR STABILISATIONOF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES; BASIC ELECTRONIC CIRCUITRY; ELECTRICITY; GENERATION OF NOISE BY SUCH CIRCUITS; GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING,BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN ANON-SWITCHING MANNER; MEASURING; MEASURING QUANTITY OF HEAT; MEASURING TEMPERATURE; PHYSICS; TESTING; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR

PROBLEM TO BE SOLVED: To enable a temperature sensor to flexibly respond to required accuracy.SOLUTION: An oscillator 11 generates clock signals. The oscillator 11 is configured so that a relation between temperature and frequency of generated clock signals can be changed. A counter 13 counts clock signals generated by the oscillator 11 using reference signals of which frequency does not change depending on temperature. A CPU 16 generates temperature information based on a count value of the counter 13 and a relation between temperature and frequency of clock signals in the oscillator 11. A control circuit 14 changes a relation between temperature and frequency of clock signals in the oscillator 11 when the counter 13 overflows.SELECTED DRAWING: Figure 1 【課題】温度センサとして要求精度に応じた柔軟な対応を行うことを可能にする。【解決手段】発振器１１はクロック信号を生成する。発振器１１は、生成するクロック信号の周波数と温度との関係が変更可能に構成される。カウンタ１３は、発振器１１で生成されたクロック信号を、温度に依存して周波数が変化しない基準信号を用いてカウントする。ＣＰＵ１６は、発振器１１におけるクロック信号の周波数と温度との間の関係、及びカウンタ１３のカウント値に基づいて温度情報を生成する。制御回路１４は、カウンタ１３がオーバフローした場合に、発振器１１におけるクロック信号の周波数と温度との関係を変化させる。【選択図】図１