Method and integrated circuit for wireless power supply system of active stylus

An integrated circuit for use in an active stylus including a receiver that receives an uplink signal transmitted from an electronic device, a transmitter that transmits a downlink signal to the electronic device, and a power receiver that receives power wirelessly supplied from the electronic device, the integrated circuit comprising:

• a terminal configured to be coupled to the transmitter;
• and
• a terminal configured to be coupled to the receiver,
• a terminal configured to be coupled to the power receiver,
• wherein the integrated circuit, in operation, when the power is not being supplied to the power receiver, causes the transmitter to transmit the downlink signal in response to the receiver receiving the uplink signal, and stops transmission of the downlink signal by the transmitter in response to detecting that supply of the power to the power receiver has started,
• wherein, after the integrated circuit stops transmission of the downlink signal by the transmitter in response to detecting that supply of the power to the power receiver has started, the integrated circuit causes the receiver to receive the uplink signal in response to detecting that supply of the power to the power receiver has ended.