Integrated circuit and circuit board

Details Integrated circuit and circuit board Integrated circuit and circuit board

2007-05-08

2007-05-08

Hollington, Jermele (Department: 2829)

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

Of individual circuit component or element

C324S765010, C714S733000

Reexamination Certificate

active

11212358

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.

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