Patent ID: 6781362
Filing Date: 2004-08-24
Classification: G01R

Abstract:
An engine control device having screening apparatus for checking for latent defects in integrated circuit elements contained therein, said device comprising:a voltage source circuit having a reference voltage source for outputting electric power with a rated voltage to an output side power line, based on a comparison of a reference voltage supplied by said reference voltage source with a voltage derived from said electric power; an integrated circuit for processing engine control information, said integrated circuit being supplied with the electric power through said output side power line; a first resistor having one end thereof connected to said output side power line; a second resistor connected between another end of said first resistor and ground; and a series circuit of another resistor connected in parallel to said second resistor via a switch; wherein a voltage higher than said reference voltage is fed to said integrated circuit by varying a ratio of resistance values of said first resistor and said second resistor using said switch, whereby said voltage derived from said electric power is varied, causing said higher voltage to be generated for screening said integrated circuit.