Active pen capable of indicating transmission voltage and position detection system

An integrated circuit configured to control operation of an active pen used with an electronic equipment including a plurality of sensor electrodes, the integrated circuit comprising:

• a receiving circuit that, in operation, controls receiving an uplink signal from the electronic equipment;
• a transmitting circuit that, in a first operation mode, controls transmitting a first downlink signal at a first voltage to the electronic equipment and, in a second operation mode, controls transmitting a second downlink signal at a second voltage different from the first voltage to the electronic equipment, wherein the first voltage and the second voltage are selected from a plurality of voltages;
• and
• a control circuit that, in operation, controls the transmitting circuit to transmit, to the electronic equipment, a third downlink signal including information indicating a selected one of the plurality of voltages including the first voltage and the second voltage.

A position detection system comprising:

• an electronic equipment including a plurality of sensor electrodes;
• and
• an active pen including:
• a receiving circuit that, in operation, receives an uplink signal from the electronic equipment;
• a transmitting circuit that, in a first operation mode, transmits a first downlink signal at a first voltage to the electronic equipment and, in a second operation mode, transmits a second downlink signal at a second voltage different from the first voltage to the electronic equipment, wherein the first voltage and the second voltage are selected from a plurality of voltages;
• and
• a controller that, in operation, controls the transmitting circuit to transmit, to the electronic equipment, a third downlink signal including information indicating a selected one of the plurality of voltages including the first voltage and the second voltage.