Mini B-CAS card detection circuit and device

The utility model discloses a mini B-CAS card detection circuit and device, and the circuit comprises a card slot, and the mini B-CAS card detection circuit also comprises a detection module, a main control module, a voltage reduction module, and a comparison module. The detection module detects the level of the card slot detection pin and transmits the level to the main control module, and meanwhile, the detection module outputs an enable signal to the voltage reduction module when the level of the card slot detection pin is high; the voltage reduction module supplies power to the card slot power supply pin and provides a first comparison voltage for the comparison module; the comparison module generates a second comparison voltage, compares the second comparison voltage with the first comparison voltage, and provides a detection level for the main control module according to a comparison result; and when the detection pin of the card slot is at a high level and the detection level is at a low level, the mai