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TXB0104接串口单向正常,双向异常

Other Parts Discussed in Thread: TXB0104

使用TXB0104做串口电平转换,VCCA 1.8V   VCCB 3.3V   OE  1.8V 。B端接3.3V cpu的TX\RX,A端接1.8V器件的g_RX\g_TX。器件向CPU发送数据,CPU接收正常,即g_TX-》RX正常,但是CPU向器件发送数据异常(即TX-》g_RX)。测量电压,TX端只有1.3V左右,g_RX为0.原设计电路是没有任何上拉、下拉一类的,都是直连。后来飞线添加了一些上拉、下拉、电容等测试,没有任何改善。看手册好像没什么特殊控制的地方,因此搞不懂了,特此求助。

  • CPU发送的数据,在TXB0104的B端测试信号没问题吧?

    另外,还要确认下CPU的IO driver能力,TXB0104对输入端的要求:. For proper operation, the device driving the data I/Os of the TXB0104 must have drive strength of at least ±2 mA.