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:
Jun. 08, 2004
Filed:
Dec. 02, 2002
Yoshitaka Mano, Kyoto, JP;
Joji Nakane, Nara, JP;
Matsushita Electric Industrial Co. Ltd., Osaka, JP;
Abstract
In a power supply voltage detection circuit using a reference potential generation circuit, as represented by a band gap reference circuit according to a prior art, the correction of dispersion in the detection level cannot be carried out after the completion of diffusion and assembly. Therefore, a power supply voltage detection circuit is provided with a reference potential generation circuit , a divided voltage potential generation circuit and a differential amplification circuit for comparing the divided voltage potential to the reference potential. Furthermore, a ferroelectric memory which stores correction data for correcting the reference potential, a data latch circuit for storing correction data that has been read out, and a microcomputer logic unit for controlling ferroelectric memory as well as data latch circuit are provided. The reference potential is altered according to correction data so that dispersion in the power supply voltage detection level is reduced.