Question about #stm32# : The idle state of the IIC can only have external pull-up, and at this time the idle device is pulled to a high resistance state, which is equivalent to the open circuit, the entire IIC bus only opened devices will communicate norm

Problem: i2c high level and high resistance state confusion

We know that all the IIC devices are connected to a bus, so when we communicate, often only a few devices for communication, then the rest of the idle equipment may be interfered by the bus, or interfered with the bus, how to do?

In order to avoid the chaos of the bus signal, the idle state of the IIC can only have an external pull up, and at this time the idle device is pulled to a high resistance state, which is equivalent to the open circuit, the entire IIC bus only opened devices will be able to communicate normally, without interfering with other devices.

The problem is that both the SDA and SCL buses have an external pull-up resistor. Shouldn't this give a high level instead of a high resistance?