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TXB0108使用问题

Other Parts Discussed in Thread: TXB0108

我在使用TXB0108时,遇到如下问题:115200波特率的1.8V UART信号经过TXB0108转化为3.3V电平信号,1.8V侧直接接串口线打印正常,3.3V侧接串口线打印全部乱码,MCU_UART_TX_1.8V->PC_UART_TX_3.3V测试波形图如下,3.3V侧的低电平不能拉低到0V位置,同时某些时候低电平会后很多毛刺,不知什么原因造成的,怎么解决?

原理图如下:

MCU_UART_TX_1.8V到PC_UART_TX_3.3V,1.8V转化为3.3V前后的波形如下,