Hardware watchdog circuit of car electronic circuit

Abstract

The invention discloses a hardware watchdog circuit of a car electronic circuit. The hardware watchdog circuit comprises a watchdog enabling control circuit, a zero-clearing input circuit, a timer unit and a timing overflow output circuit all of which adopts independent components, wherein when a product needs a watchdog function, the watchdog enabling control circuit is turned on, and the zero-clearing input circuit can periodically input a zero-clearing signal based on the design need of the product; no overflow of the product can be guaranteed when the system is normal; when the product is abnormal, the zero-clearing input end is not zero-cleared in time, and an overflow phenomenon of the timer occurs; the timing overflow output circuit serves as an executing mechanism of the watchdog circuit to output an overflow signal; and a microprocessor or a logic control circuit connected with the timing outflow output circuit processes the overflow signal in time to guarantee normal operation of the product or reduce damage caused by a product fault to the maximum extent. The hardware watchdog circuit of the car electronic circuit, disclosed by the invention, has the advantages of reducing cost, being convenient and simple to adjust parameters, being convenient to apply, and achieving high reliability, strong stability and simple circuit design.

Description

Technical field: [0001] The invention relates to the electrical field, in particular to an automotive electronic circuit protection device, in particular to a hardware watchdog circuit for an automotive electronic circuit. Background technique: [0002] The watchdog circuit includes a timer unit, and the timer unit includes a clear input terminal and a timer overflow output terminal. When the timer overflows, the output overflow signal can control the actuator to realize the control logic of the product. The clearing input is controlled by a microprocessor or other control circuits, and the clearing signal is periodically input to ensure that the timer does not overflow and no overflow signal is output at this time; when the microprocessor or the control circuit is abnormal, If the reset signal cannot be input in time, the timer overflows and outputs an overflow signal, and the overflow actuator such as a microprocessor or other actuators executes the corresponding control l...

AI Technical Summary

Problems solved by technology

[0003] The object of the present invention is to provide a kind of hardware watchdog circuit of automobile electronic circuit, the hardware watchdog circuit of this kind of automobile electronic circuit will solve the problem that the cost of watchdog circuit of automobile electronic circuit in the prior art is too high, the product The technical problem that the stability cannot meet the requirements

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