This thread has been locked.
If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.
PCA9555 I2C接口是open-drain的吗？
您好，
PCA9555 datasheet 中虽然没有描述其I2C是open drain的，但是看内部框图，SDA是OD的，我相信SCL也是OD的以兼容其他I2C设备。
pin 部分描述I2C是需要外接上拉电阻的。
