COMMUNICATION CIRCUIT, ELECTRONIC SYSTEM, BATTERY PACK, AND ELECTRICAL DEVICE

Embodiments of this application relate to the technical field of electronic circuits, and in particular, to a communication circuit, an electronic system, a battery pack, and an electrical device. The communication circuit includes: a transmitting module, configured to transmit a signal through a communication connection wire when the communication circuit is in a transmitting state, where the communication connection wire is connected to a common positive pole shared by two communication circuits; and a receiving module, configured to receive the signal through the communication connection wire when the communication circuit is in a receiving state. When the communication circuit is in the transmitting state, the transmitting module is activated and the receiving module is deactivated. When the communication circuit is in the receiving state, the transmitting module is deactivated and the receiving module is activated. Communication connection is implemented between different subsystems by connecting to the common positive pole. Even if a ground wire between systems is disconnected, the communication function is prevented from being affected, thereby improving reliability effectively.