the internal circuit is coupled to the push-pull circuit and the internal circuit is configured to transmit a target control signal to the push-pull circuit;

the push-pull circuit is further coupled to a first external power terminal, a second external power terminal and a target node respectively, and the push-pull circuit is configured to control an on-off of the first external power terminal and the target node and an on-off of the second external power terminal and the target node in response to the target control signal;

the switching circuit is coupled to a first control terminal, the I/O interface and the target node respectively, and the switching circuit is configured to transmit an electric potential of the target node to the I/O interface in response to a first control signal provided by the first control terminal; and

an electric potential of a first power signal provided by the first external power terminal is greater than that of a second power signal provided by the second external power terminal,

wherein the electric potential of the first power signal is 1.2 V or 1.8 V, and the electric potential of the second power signal is 0 V.