Integrated circuit, circuit board, and electronic apparatus

An integrated circuit comprising:

• a terminal to which an impedance element and a power supply having a predetermined potential can be connected, wherein
• the integrated circuit is configured to change a potential of one of electrodes of the impedance element connected to the terminal, detect a change in electrical characteristics of the terminal based on characteristics of the impedance element when the potential of the one electrode of the impedance element is changed, to determine a setting condition among a plurality of setting conditions that are used for an operation of the integrated circuit, and store the setting condition in a storage,
• the integrated circuit is configured to use the setting condition stored in the storage for the operation of the integrated circuit,
• the integrated circuit comprises:
• a signal input part that is configured to receive a signal through the terminal;
• and a control unit configured to control a signal output part that is electrically connected to the one electrode of the impedance element and is configured to output a signal to change the potential of the one electrode, wherein the control unit is configured to detect a first transition state of the electrical characteristics of the terminal and a second transition state of the electrical characteristics of the terminal after the first transition state in response to the control of the signal output part, and determine the setting condition among the plurality of setting conditions based on the detected first transition state and second transition state, and
• the control unit is configured to:
• (i) receive a first signal from the signal input part while stopping the output of the signal output part;
• (ii) after the first signal is received, output from the signal output part a second signal whose electrical characteristics are different from those of the first signal;
• (iii) after the second signal is output, stop the output of the signal output part;
• (iv) after a predetermined condition is satisfied after the output of the signal output part is stopped, receive a third signal from the signal input part;
• and (v) store a first part of the setting condition corresponding to the received first signal and a second part of the setting condition corresponding to the received third signal in the storage.