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:
Dec. 11, 2012
Filed:
Jul. 15, 2010
Andre Luis Vilas Boas, Campinas, BR;
Alfredo Olmos, Austin, TX (US);
Fabio DE Lacerda, Niteroi, BR;
Edgar Mauricio Camacho Galeano, Campinas, BR;
Andre Luis Vilas Boas, Campinas, BR;
Alfredo Olmos, Austin, TX (US);
Fabio de Lacerda, Niteroi, BR;
Edgar Mauricio Camacho Galeano, Campinas, BR;
Freescale Semiconductor, Inc., Austin, TX (US);
Abstract
A low voltage detector () includes a voltage and current reference circuit (); a power supply voltage monitor circuit (), coupled to the voltage and current reference circuit and to a power supply; and a voltage comparator (), coupled to the voltage and current reference circuit and to the power supply voltage monitor circuit. The voltage and current reference circuit includes a self-cascode MOSFET structure (SCM) () that produces a reference voltage. The power supply voltage monitoring circuit includes another SCM () that produces a monitor voltage, related to the power supply voltage. The reference voltage and the monitor voltage have a same behavior with changes in temperature, thereby allowing the trip point of the low voltage detector to minimally vary with temperature. The low voltage detector is disposed on an integrated circuit (), and the transistors of the low voltage detector consist of only CMOS transistors.