Circuit device, control device, power receiving device, and electronic device

A circuit device, comprising:

• a measurement circuit that measures a battery voltage;
• an interface circuit that outputs, to a processing device, battery voltage information that is information regarding the battery voltage measured by the measurement circuit;
• and
• a control circuit that performs battery protection control processing;
• the measurement circuit having:
• a counter;
• a resistance circuit provided between a node where the battery voltage is input and a ground node, with a voltage division ratio set by a count value of the counter, and the resistance circuit outputting an output voltage obtained by dividing the battery voltage by the voltage division ratio;
• and
• a comparator that compares the output voltage from the resistance circuit with a reference voltage,
• wherein when a power supply from a battery to the processing device is off, the counter sets the count value to a fixed value, and the control circuit performs the battery protection control processing based on a comparison result of the comparator, and
• the resistance circuit having:
• a variable resistance circuit where the battery voltage is input to one end, and a resistance value is set by the count value;
• and
• a first resistor and a second resistor connected in series between the other end of the variable resistance circuit and a ground node,
• wherein a voltage of a node between the first resistor and the second resistor is output to the comparator as the output voltage.