Digital circuit state detection circuit and digital circuit state detection method

The invention relates to a digital circuit state detection circuit and a digital circuit state detection method, and belongs to the technical field of electronics. The circuit comprises a digital state detection processing module, a controller, and a state indication communication module. The detection processing module includes a protection circuit, a voltage division circuit, and a clamping circuit. The circuit converts the voltage of a three-digital-state signal, sends the signal to an AD sampling interface of the controller, compares an acquired signal with a calibration value preset by the controller, and finally judges and displays the three states of a digital circuit. On the basis of expansion, circuit self-detection and detected circuit fault location and alarm indication can be realized. Artificial manual line check is not needed for the confirmation of circuit connection. Therefore, detection is more convenient and more efficient, and fault location is quicker and more accurate. The technical problem that the efficiency of traditional digital circuit state detection is low and fault isolation and location is difficult to realize is solved effectively, and the reliability of circuit detection is improved.