Bioelectrical impedance measuring apparatus, semiconductor device, and control method for bioelectrical impedance measuring apparatus

A semiconductor device comprising:

• a reference resistor;
• a current supply unit that supplies a current between first and second current output terminals;
• a voltage measurement unit that measures a voltage input to first and second voltage input terminals;
• a first switch unit that connects the first current output terminal to one or both of the first current supply electrode and a first terminal of the reference resistor, and connects the second current output terminal to one or both of the second current supply electrode and a second terminal of the reference resistor, the first and second current supply electrodes being configured to contact a living organism to be measured;
• a second switch unit that connects the first voltage input terminal to one or both of the first voltage measurement electrode and the first terminal of the reference resistor, and connects the second voltage input terminal to one or both of the second voltage measurement electrode and the second terminal of the reference resistor, the first and second voltage measurement electrodes being configured to contact the living organism;
• and
• a control circuit that controls the first and second switch units to control bioelectrical impedance measurement processing, wherein
• the control circuit causes the first switch unit to connect the first current output terminal to the first terminal of the reference resistor, and to connect the second current output terminal to the second terminal of the reference resistor,
• the control circuit causes the second switch to connect the first voltage input terminal to the first terminal of the reference resistor, and to connect the second voltage input terminal to the second terminal of the reference resistor, and
• the control circuit causes the voltage measurement unit to measure a voltage between the first voltage input terminal and the second voltage input terminal, to thereby perform self-diagnosis of a path through which a current flows.

A control method for a bioelectrical impedance measuring apparatus, comprising:

• connecting a first current output terminal of a current supply unit to a first terminal of a reference resistor, the current supply unit being configured to supply a current between the first current output terminal and a second current output terminal;
• connecting the second current output terminal of the current supply unit to a second terminal of the reference resistor;
• connecting a first voltage input terminal of a voltage measurement unit to the first terminal of the reference resistor, the voltage measurement unit being configured to measure a voltage to be input to the first voltage input terminal and a second voltage input terminal;
• connecting the second voltage input terminal of the voltage measurement unit to the second terminal of the reference resistor;
• and
• measuring a voltage between the first voltage input terminal and the second voltage input terminal, to thereby perform self-diagnosis of a path through which a current flows.