i2c为何加上拉电阻?

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i2c为何加上拉电阻?

i2c为何加上拉电阻?
i2c为何加上拉电阻?

i2c为何加上拉电阻?
I2C bus SCL/SDA lines are driving and connecting by using open-drain structure.
That is output logic 0 by driven low voltage 0.Output logic 1 by driven High-Z and pull to high voltage by external PCB pull-high resisters.