Patent ID: 11899861
Assignee: WACOM CO., LTD.
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 0:
1. A pen comprising:
an electrode;
a power supply circuit which, in operation, supplies a first voltage;
a first integrated circuit coupled to the power supply circuit, wherein the first integrated circuit, in operation, outputs a transmission signal at the first voltage;
a second integrated circuit including a level shifter which, in operation, outputs the transmission signal at a second voltage that is higher than the first voltage;
an inter-integrated circuit wire which, in operation, supplies the transmission signal having the first voltage from the first integrated circuit to the second integrated circuit;
an electrode wire which, in operation, supplies the transmission signal having the second voltage from the second integrated circuit to the electrode; and
a step-up circuit coupled to the power supply circuit, wherein the step-up circuit, in operation, supplies the second voltage to the level shifter,
wherein the second integrated circuit further includes:
an Rx terminal which, in operation, outputs a reception signal received by the electrode;
a Tx terminal which, in operation, receives the transmission signal; and
a switch which, in operation, switches a destination to which the electrode wire is coupled between the Rx terminal and the Tx terminal,

wherein the high voltage switch includes an Rx guard circuit which, in operation, prevents the transmission signal from flowing into the Rx terminal,
wherein the Rx guard circuit, in operation, sets a potential of a wire coupled to the Rx terminal to a predetermined potential.