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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。