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. 17, 2009
Filed:
Nov. 22, 2005
Azuma Araya, Kawasaki, JP;
Azuma Araya, Kawasaki, JP;
NEC Electronics Corporation, Kanagawa, JP;
Abstract
Suppression malfunction of an authentication circuit for authenticating a battery pack. Signal line for applying an intermediate potential between the power supply and ground and for reading the potential of a thermistor for detecting the temperature is used as a transmission path for exchanging data between a battery pack and main device. A master-authentication circuit and slave-authentication circuit comprise level-correction circuits, which are connected to the signal line by way of a voltage-comparator circuit. The level-correction circuits are constructed such that they correct the signal applied to the signal line so that it is greater than or less than the unstable-region voltage, and outputs it to the input end of the authentication circuits, so that unstable-region voltage is not applied to the input end. Output circuits overlap in turn authentication information onto the signal line when performing authentication, and the level-correction circuits receive the respective information, and authentication is performed.