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请问TCA9535/TCA9534 如何进入Standby mode，在进入Standby mode模式之前是否需要对IO口做何种配置（如设置为输入）？
datasheet中给出standby的测试条件，可以看出，Fclk=0Khz, VI = VCC或GND , IO = 0, I/O = inputs时standby电流不同。
所以如果需要standby模式，可以直接按照测试条件配置，Fclk=0Khz, VI = VCC或GND , IO = 0, I/O = inputs
