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:
Mar. 25, 2014
Filed:
Dec. 17, 2010
Masashi Nogawa, Tucson, AZ (US);
Masashi Nogawa, Tucson, AZ (US);
Texas Instruments Incorporated, Dallas, TX (US);
Abstract
Supply voltage sequencing circuitry includes a first sequencer (-) that produces an active level of a Power Good signal PG if a first supply voltage Vexceeds an upper threshold Vwhile a control signal EN_PG is active, and produces an inactive level of PG if EN_PG is inactive. The PG level is latched when a control signal EN is inactive. A Power Down signal PD is produced if Vis less than a lower threshold Vwhile EN is inactive. An active level of PD is produced when EN is active. A power-up sequence of supply voltages V, V, and Vmonitored by the first sequencer and similar second (-) and third (-) sequencers, respectively, is determined by connection of PG of each of the first and second sequencers to control the supply voltage monitored by the next sequencer. A desired power-down sequence of the supply voltages is determined by connections of the PDs of the first and second sequencers in the power-down sequence to EN_PG inputs and EN inputs of other sequencers, respectively, in accordance with a predetermined power-down algorithm.