Detection circuit of key module and vehicle-mounted emergency call system

Abstract

The utility model discloses a detection circuit of a key module and a vehicle-mounted emergency call system. The detection circuit of the key module comprises a controller; the output end of the first voltage dividing module is connected with the interrupt end of the controller; the output end of the second voltage division module is connected with the analog-to-digital conversion end of the controller, and the input end of the second voltage division module is used for being connected with the diagnosis signal output end of the key module; the output end of the switch module is connected with the input end of the first voltage dividing module, and the input end of the switch module is used for being connected with the key signal output end of the key module; the output end of the power supply module is used for being connected with the key signal output end of the key module. A software analog-to-digital conversion detection mode is adopted, and various connection states of the key module are monitored in real time; the key state can be identified in an interruption mode, the controller is quickly awakened, the key state is quickly responded, the operation time of the controller is saved, and the efficiency is improved.

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