问题描述： i2c为何加上拉电阻? 1个回答 分类：英语 2014-09-24 问题解答： 我来补答 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. 展开全文阅读
