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TRS3122E: 串口乱码

Part Number: TRS3122E

上图为设计图纸。

环境描述:CPU的串口信号(1.8V)直接接到芯片上面然后转出接到连接器上面。C1/C2/C3选用的电容都是100nf/0402封装。C34/C35/C36也都是100nf、0402封装。V-约为-4.81V左右。

问题描述:TX/RX信号可以正常输出输入,但是输入输出均为乱码。请帮忙判断一下可能的原因、