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:
Apr. 21, 2009
Filed:
Mar. 27, 2006
Jane Xin-leblanc, Sunnyvale, CA (US);
Jane Xin-LeBlanc, Sunnyvale, CA (US);
National Semiconductor Corporation, Santa Clara, CA (US);
Abstract
A system and method for providing a low standby power interface for a low voltage I2C compatible bus is disclosed. A level shifter circuit is provided that comprises a first input connected to the I2C compatible bus, a second input connected to a busy signal line from an I2C slave module, and an output connected to the I2C slave module. The level shifter circuit increases its bias current in response to a busy signal from the I2C slave module that indicates that the I2C slave module is active. The level shifter circuit changes from its low power mode to a high power mode sufficiently quickly to receive high speed data from a serial data line of the IC2 compatible bus. After the data transfer has been completed, the level shifter circuit returns to a low power mode.