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Original question:
TCA9535: 无法配置输入问题
器件进行I2C通讯时，ACK信号无法拉到3.3V，且ACK的时间明显短，波形如下，这样会影响到I2C通讯吗？
您好，
请问I2C master是用的IO口模拟的，还是I2C控制器？
由于应答信号（ACK低电平 NACK高电平）在第9个时钟，Master是否释放了SDA总线，等待ACK信号到来？
