Power supply device and power supply control circuit

A power supply control circuit configured to operate with a power supply device including a battery module and a charge-discharge switching element connected in series to the battery module, the charge-discharge switching element being configured to charge and discharge the battery module, the power supply control circuit being configured to turn off the charge-discharge switching element when an abnormality occurs, the power supply control circuit comprising:

• an analog circuit configured to control turning on and off of the charge-discharge switching element;
• a digital circuit configured to control the analog circuit;
• and
• a switch-OFF circuit configured to control the charge-discharge switching element, wherein
• the analog circuit includes:
• an analog-side communication terminal configured to control the turning on and off of the charge-discharge switching element in response to an instruction from the digital circuit;
• a switch-OFF terminal configured to turn off the charge-discharge switching element, the switch-OFF terminal being different from the analog-side communication terminal,
• the digital circuit includes:
• a digital-side power feeding terminal configured to receive, from outside, driving power that powers the digital circuit;
• and
• a non-operating terminal configured to have a state changed from an operating state to a non-operating state in response to a non-operation of the digital circuit, and the switch-OFF circuit is configured to:
• output a first signal from the non-operating terminal not to turn off the charge-discharge switching element when the digital circuit is in a normal state and receives the driving power that powers the digital circuit;
• output a second signal different from the first signal to turn off the charge-discharge switching element when the digital circuit is in an abnormal state and receives the driving power that powers the digital circuit;
• and
• cause the non-operating terminal to be in a floating state when the digital circuit does not receive the driving power that powers the digital circuit and does not operate.