Ask you heroes if there is a mature circuit connecting 3V and 5V of I2C. Although MAX and ADI have related chips, the price is higher and the order is not easy. Hope there is a simple and practical circuit.
Ashlee 发表于 January 13, 2021
Just take a two-way level conversion circuit, use a triode, or 74HC244
Anika 发表于 January 13, 2021
See if the data sheet can be directly connected.
Marie 发表于 January 13, 2021
The discrete 3V I2C device interfaces with the 5V I2C device.
Arielle 发表于 January 13, 2021
It is divided into two parts: 3.3V to 5V is solved with HC series buffers, and 5V to 3.3V is solved with series resistors.
Maurice 发表于 January 13, 2021
It can be connected directly without additional conversion. The I2C bus protocol has such a benefit. The I2C bus stipulates that the SCL and SDA lines must be "open-drain" structures, and external pull circuits are required. For 3V and 5V devices, their I2C bus can be directly connected-because it is open drain, there is no problem.
