| 摘要 |
A power fail safe circuit of a smart key system is provided to maintain the igniting-on state of vehicles while driving without special diagnosing logic. A power fail safe circuit of a smart key system comprises: a start button(100); a power distribution module(200); a relay box(300); a main part MICOM(210) performing the power source state movement by checking the start button push time; a secondary MICOM(220) taking a plate of the secondary MICOM when error was generated; and a powered terminal comparator(230) determining the electric power supply of the relay box by determining the power state and not-ready state of the main part and secondary MICOM. The main part MICOM operates the relay box for the power source movement by performing the time control by the input of the start button in the state memorizing the vehicle power state. |
