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:
May. 08, 2007
Filed:
Aug. 26, 2005
Tetsuya Yokota, Kawasaki, JP;
Tetsuya Yokota, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
In an integrated circuit implemented on a circuit board, output lines of an output circuit that outputs a logic signal are connected to the circuit board by soldering of a leadless terminal that cannot be seen as being implemented. A fault diagnosing unit tests an output voltage of the leadless terminal with respect to the circuit board as being implemented to determine whether the output voltage is a normal voltage or an abnormal voltage. The fault diagnosing unit includes a pseudo-output unit that applies a pseudo-set predetermined pseudo-output voltage to the leadless terminal, a first switching unit that cuts a connection of the output terminal to the leadless terminal at the time of fault diagnosis, a second switching unit that supplies a pseudo-output voltage of the pseudo-output unit to the leadless terminal side as being cut, a measuring unit that measures a voltage of the leadless terminal in a fault diagnosis state resulting from diagnosis switching, and a determining unit that determines from the measured voltage whether a voltage of the leadless terminal is a normal voltage or an abnormal voltage.