brief introduction： Power monitoring chip function: ensure the microprocessor system stable and reliable operation.Working principle of the power monitoring chip: by monitoring the state of the system's power supply and the state of the dog feeding signal fed back by the system's MCU, the reset of the MCU and the power down notification operation can be realized.The common chips are: power monitoring chip IMP809, the chip is powered by 3.0V, 3.3V or 5.0V power monitoring circuit, especially suitab

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