Automotive electronic locks circuit

Automotive electronic locks circuit principle is shown in Fig. ICl dedicated lock IC 5G058, it O ~ feet respectively external key switch to the positive power supply, which is

six valid input keys, unlock Sl ~ S6 must comply with this order; feet have connected key switch S7 is false key input, you can freely access one or a few keys on the keyboard mixed into real ones; a feet is the key indicator pin during each key communication will make the external light emitting diode emitting LEDl confirm that the key input is valid; ? feet alarm an output terminal, if not by Sl ~ S6 sequentially input or exceed the effective unlocking time, the output high, burglar alarm trigger IC2 language effectively unlocking time by the size of the capacitor C1 and potentiometer RPl to decide.

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