Our project connects PCA9545 and PCF8575 through MCU IIC. Currently, I can configure PCA9545 through MCU and read the information I configured. When I configure 0xF, it means that all channels are open, and then I send PCF8575 through MCU. I have addressed a (0x40) a0 a1 a2 of my PCF8575, but I have not received a response ACK from PCF8575. What is the reason?
Is there a problem with my operation sequence? I first configure the channel of the PCA9545 through the MCU, then send a STOP to stop, then start the IIC, and directly address the PCF8575. Is there a problem with the operation?
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