Circuit device, electronic device, and vehicle

A circuit device comprising:

• a high speed driver (HS driver) that is a high speed mode transmission circuit (HS mode transmission circuit) of a universal serial bus (USB);
• and
• a disconnection detection circuit that performs disconnection detection of the USB,
• wherein the disconnection detection circuit includes:
• a first holding circuit that measures and holds first voltage level information that is voltage level information of one signal out of a positive data terminal (DP signal) and a negative data terminal (DM signal) of the USB when the HS driver is transmitting a host chirp,
• a first determination voltage generation circuit that generates a first determination voltage based on the first voltage level information, and
• a detection circuit that performs disconnection detection of the USB based on the first determination voltage, and outputs a disconnection detection signal, wherein
• the first holding circuit includes a first holding register that holds, as a first detected value, the first voltage level information of the one signal when the HS driver is transmitting a high speed mode host chirp (HS-mode host chirp) as the host chirp,
• the first determination voltage generation circuit generates the first determination voltage based on the first detected value,
• the first holding circuit includes a second holding register that holds, as a second detected value, the first voltage level information of the one signal when the HS driver is transmitting a full speed mode host chirp (FS-mode host chirp) as the host chirp, and
• the first determination voltage generation circuit generates the first determination voltage based on the first detected value and the second detected value.