Bio-stimulating and bio-signal measuring circuit

A circuit for measuring a bio-stimulating signal and a bio-signal, the circuit comprising:

• a bio-stimulating signal generating circuit configured to generate a bio-stimulating signal in a bio-stimulating mode;
• first and second bio-signal electrodes configured to output the bio-stimulating signal generated in the bio-stimulating mode and receive a bio-signal in a bio-signal measuring mode;
• a multiplexer configured to select at least one of the first and second bio-signal electrodes by a control signal and connect the selected bio-signal electrode to the bio-stimulating signal generating circuit;
• a connection node configured to allow the bio-stimulating signal generating circuit and the multiplexer to be connected thereto;
• a switch block configured to be turned on in a case where a voltage of the bio-stimulating signal is greater than a first reference voltage or lower than a second reference voltage;
• first and second serially connected resistors configured to be connected between the connection node and the switch block and divide a voltage of a signal of the selected bio-signal electrode according to whether the switch block is turned on;
• and
• a bio-signal measuring circuit configured to measure voltage signals divided by the first and second resistors or measure a signal of the selected bio-signal electrode, according to whether the switch block is turned on,
• wherein the first reference voltage is greater than the second reference voltage.