Stylus and sensor control circuit

A stylus comprising:

• a cylindrical housing;
• a tip portion provided on a tip side of the housing and including a tip electrode;
• a tail portion provided on a tail side of the housing and including a tail electrode;
• a power circuit provided in the housing;
• a first transmission circuit which, in operation, receives power from the power circuit and generates a first downlink signal that is transmitted toward an outside of the housing through the tip electrode;
• a second transmission circuit which, in operation, receives power from the power circuit and generates a second downlink signal that is transmitted toward the outside of the housing through the tail electrode, wherein the second downlink signal is different from the first downlink signal;
• and
• a control circuit which, in operation, controls the first transmission circuit and the second transmission circuit according to a plurality of transmission modes,
• wherein the transmission modes include:
• a first transmission mode in which the control circuit controls the first transmission circuit to transmit the first downlink signal from the tip electrode and controls the second transmission circuit to stop transmission of the second downlink signal from the tail electrode, and
• a second transmission mode in which the control circuit controls the first transmission circuit to stop transmission of the first downlink signal from the tip electrode and controls the second transmission circuit to transmit the second downlink signal from the tail electrode, and
• wherein, in a hover state in which both the tip portion and the tail portion do not contact a touch surface of an electronic device including a touch sensor, the control circuit controls according to the first transmission mode or the second transmission mode based on a determination regarding a grasp state of the housing.