Signal determination apparatus and temperature determination apparatus

A signal determination apparatus, comprising:

• a signal detection section comprising an A/D input port;
• an analog signal generation section connected to the A/D input port and configured to:
• detect a temperature detection process;
• and
• output an analog signal indicating temperature to the A/D input port;
• a priority signal generation circuit configured to generate a priority signal based on a received external control signal;
• and
• a level shift section configured to:
• shift a level of the analog signal output from the analog signal generation section to a low level within a second level range in response to the received priority signal;
• and
• provide the shifted analog signal to the A/D input port,
• wherein, when the signal detection section detects that the level of the analog signal is within a first level range, a temperature determination process of the analog signal is performed,
• wherein, when the signal detection section detects that the level of the analog signal is within the second level range, the temperature determination process of the analog signal is not performed,
• wherein, when the signal detection section detects that the level of the analog signal is within the second level range, different from the first level range, a first process corresponding to the received priority signal is performed, and
• wherein, when the signal detection section detects that the level of the analog signal is within the second level range and detects that a speed of change of the analog signal indicating an amount of level shift per a predetermined time of the analog signal is lower than a threshold value, the signal detection section determines that the priority signal is not generated by the priority signal generation circuit and a second process, different from the temperature determination process of the analog signal and from the first process, is performed.