The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 30, 1999
Filed:
Jan. 14, 1998
Yasuhiro Sakurai, Tokorozawa, JP;
Citizen Watch Co., Ltd., Tokyo, JP;
Abstract
In a temperature sensor, between a first power supply and a second power supply, there are disposed a resistor group consisting of a plurality of resistors connected in series and a MOS transistor in the form of a temperature transducer, the resistor group being connected in series with the MOS transistor having a drain connected to the resistor group and having a source and a bulk which are connected to the first power supply. The temperature sensor further comprises a switch group consisting of switches for opening and closing the connections between the connection points of the adjacent resistors of the resistor group and the second power supply, an external terminal connected to the drain of the MOS transistor, a temperature-compensated constant voltage generating circuit for generating a gate voltage as an output voltage to the MOS transistor, and a non-volatile memory which stores therein data for adjusting the output voltage from the temperature-compensated constant voltage generating circuit and the state of opening and closing of the switches of the switch group. With the voltage at the second power supply as the reference, the drain voltage at the MOS transistor is output as temperature information to the external terminal.