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I2C总线中的ACK只能下拉到1.5V,请大牛支招



我的项目用到了I2C总线,开始用F28069自带的模块工作在中断方式和轮询方式,结果2者都不能出数据,无奈我用GPIO仿真I2C,在示波器里发现,传感器ACK响应了,但是ACK不能将电压拉倒低,只能将电压拉倒1.5V 左右,

请大牛帮帮分析分析原因!

有上拉电阻10千欧.