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tpl0102 i2c通讯不通问题

主芯片使用gpio模拟i2c通讯,i2c信号使用4.7k的电阻上拉到3.3v,原理图如图一;通讯频率为22k,通讯的波形均如附件中图二(写入数据时ack信号异常逻辑电平为2.4v(逻辑高地平3.3v,逻辑低电平0v)):

 图一

 

图二