关键词: I²C总线, 热插拔, 总线状态检测, 预充电, 电容隔离

Abstract: A hot swap circuit design for I2C bus card was put forward, which solved the problem during hot insertion into a live backplane of I2C bus card. By introducing the impact on the system during hot insertion, a detailed circuit design method for hot insertion was proposed. The circuit had a function of bus state detection. By bus voltage pre-charging and capacitance isolation, the disturbance on the bus was significantly decreased during hot insertion, which ensured the stability of the system effectively.

Key words: I²C bus, hot insertion, bus status detection, pre-charging, capacitance isolation