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:
Jan. 27, 2009
Filed:
Jan. 20, 2007
Jianjun Luo, Sunnyvale, CA (US);
Chris Tsu, Saratoga, CA (US);
Charles C. Lee, Cupertino, CA (US);
Ming-shiang Shen, Taipei Hsien, TW;
Jianjun Luo, Sunnyvale, CA (US);
Chris Tsu, Saratoga, CA (US);
Charles C. Lee, Cupertino, CA (US);
Ming-Shiang Shen, Taipei Hsien, TW;
Super Talent Electronics, Inc., San Jose, CA (US);
Abstract
A dual-voltage secure digital (SD) card can be inserted into a legacy host or a newer host. Legacy hosts drive a high voltage such as 3.3 volts onto the power line of the SD bus, while newer hosts drive the power line with a reduced voltage such as 1.8 volts. A flash and voltage controller chip on the SD card has a controller core that operates at the reduced voltage. A voltage regulator on the SD card, or a power management unit inside the controller chip generates an internal power voltage of 1.8 volts from the dual-voltage SD bus power line. The internal power voltage is applied to the controller core and to a voltage converter that generates a flash power voltage from the internal power voltage. The flash power voltage is applied to flash-memory chips on the SD card that operate at the higher voltage.