Protection device control method and circuit based on AD chip working state

The invention discloses a protection device control method and circuit based on the AD chip working state, belongs to the technical field of industrial control, and aims to solve the technical problems in the prior art that when the comparator is utilized to monitor the working voltage of the AD chip, the cost is too high due to setting the comparator threshold value through the reference source,the circuit design is complicated due to additional arrangement of the latch circuit and the comparator output signal is connected to the protection CPU interrupt pin, which may lead to the locking ofthe comparator and the failure of the monitoring function. The method comprises the following steps: the watchdog chip obtains the working voltage of the AD chip, and the monitoring voltage thresholdvalue of the watchdog chip is adapted to the voltage range of the AD chip; the working voltage is compared with the monitoring voltage threshold value to obtain a voltage comparison result; and the protection device makes a co