Passive tag I2C bus driving circuit, passive chip and communication system

The invention discloses a passive tag I2C (Inter-Integrated Circuit) bus driving circuit, which is integrated in a chip, and comprises an I2C interface module provided with a data input end and a data output end; the data input end is used for receiving data from the sensor; the data output end is used for transmitting data from the chip to the sensor; the reverse three-state gate structure circuit is used for controlling the data transmission direction under the action of the enable signal EN; when the enable signal EN is enabled, data from the chip is controlled to be transmitted to the sensor, and when the enable signal EN is not enabled, data from the sensor is controlled to be transmitted to the chip or is in a high-resistance state; the pull-up module is used for pulling the level state of the I2C bus to the power supply voltage; and the amplification detection circuit is used for processing the data transmitted by the I2C bus and then transmitting the data to the I2C interface module. According to the