Can you replace the RTC battery of StamPLC, if it is end-of-life?
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Posts made by nvko23
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StamPLC: Replace RTC battery?posted in General
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StamPLC: Interrupt of IO expander AW9523posted in General
I have a M5Stack StamPLC. According to the PCB schema, the ESP G14 (SYS_INT) is connected to the AW9523 INTN. According to AW9523 specs INTN indicates state changes of IO ports and it should be 0 (low-level active), if new state (interrupt request). Unfortunately INTN is always active. It doesn't matter how the AW9523 interrupt enable register is configured or whether data was already read. It's always active. According to AW9523 specs, a 4.7 kΩ resistor is needed to make INTN work properly. I can't see that on the PCB schema of StamPLC. But why is INTN then connected to the ESP? Or is any other IC in the StamPLC putting SYS_INT constantly to 0? Any hints?