Temperature sensor circuit having trimming function
AssigneeKabushiki Kaisha Toshiba
InventorMasaru Mizuta
Life of this patent
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Abstract
A temperature sensor circuit includes a temperature detecting circuit, a preset value storing circuit, and a current supplying circuit. The temperature detecting circuit is configured to generate a first temperature voltage in accordance with an ambient temperature and a current. The preset value storing circuit stores a second temperature voltage preset for a predetermined ambient temperature as a digital value. The current supplying circuit supplies the current to the temperature detecting circuit. The current supplying circuit supplies the current such that the first temperature voltage generated by the temperature detecting circuit at the predetermined ambient temperature is equal to the second temperature voltage.
Claims16
A temperature sensor circuit comprising:
- a temperature detecting circuit configured to generate a first temperature voltage in accordance with an ambient temperature and a current;
- a preset value storing circuit which stores a second temperature voltage preset for a predetermined ambient temperature as a digital value;
- and
- a current supplying circuit which supplies the current to the temperature detecting circuit, such that the first temperature voltage generated by the temperature detecting circuit at the predetermined ambient temperature is equal to the second temperature voltage.
A temperature sensor circuit having a trimming operation mode and a normal operation mode, comprising:
- a current supplying circuit which supplies a current;
- a temperature detecting circuit configured to generate a first temperature voltage in accordance with an ambient temperature and the current supplied from the current supplying circuit;
- a preset value storing circuit which stores a second temperature voltage preset for a predetermined ambient temperature as a digital value;
- a comparing and converting circuit configured to, in the trimming operation mode, compare the first temperature voltage generated by the temperature detecting circuit at the predetermined ambient temperature with the second temperature voltage, and generate a control signal of a digital value which controls the current supplying circuit so as to equalize the first and second temperature voltages;
- and
- an adjusted value storing circuit which stores the control signal to equalize the first and second temperature voltages.
A method for adjusting a temperature sensor circuit comprising:
- storing a first temperature voltage of a digital value corresponding to a predetermined temperature in a first storing circuit;
- setting a control signal of a digital value to cause a current supplying circuit to supply a current;
- converting an ambient temperature to a second temperature voltage based on the ambient temperature and the current;
- controlling the current to equalize the first and second temperature voltages;
- and
- storing in a second storing circuit the control signal which causes the current supplying circuit to supply the current that equalizes the first and second temperature voltages.
Dependencies are inferred from the claim text.