3.3V控制器与5V外设之间,通过SPI通信,使用TI的TXB0108PWR型号进行逻辑电平转换,原理图如上,但SPI通信异常,想请教是哪个地方的问题?
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您好,
具体是怎样异常?可以附上输入和对应输出的波形吗?
请注意TXB系列器件不适应于OD 接口,且驱动TXB接口的器件至少有2mA的驱动能力。TXB器件驱动容性负载要小于70pF,因此PCB 走线长度和connecor的寄生电容等都要考虑。下面文档列出了一些注意事项: