PCF8574 INT pin on KC868-A6 — Is it connected to ESP32? Schematic request.

[Asil]

Hello,
I am using the KC868-A6 board and reading digital inputs through the PCF8574.
I need to know whether the INT (nINT) pin of the PCF8574 is connected to any GPIO pin of the onboard ESP32.
I have checked the hardware documentation, but I could not find a clear answer.
Some older forum posts suggest that the INT pin might not be connected at all, but I want to confirm this specifically for the KC868-A6.
Could you please clarify:

1. Is the PCF8574 INT pin connected to the ESP32 on the KC868-A6 board?
   
2. If yes, which ESP32 GPIO pin is it wired to?
   
3. If not, is there a pad or test point where the INT pin can be accessed so we can wire it manually?
   
4. If possible, could you share the related portion of the schematic or PCB layout showing the PCF8574 connections?
   

I want to use hardware interrupts instead of polling the inputs constantly, so knowing the actual connection would help a lot.
Thank you very much!

[admin]

1. A6 board have not used the INT pin for PCF8574.
2. the INT pin not connect with pcb wire, so if you want to use, you need to solder the pin for your extend wire.
here is schematic of KC868-A6: https://www.kincony.com/download/KC868-A6-schematic.pdf

[Asil]

1. A6 board have not used the INT pin for PCF8574.
2. the INT pin not connect with pcb wire, so if you want to use, you need to solder the pin for your extend wire.
here is schematic of KC868-A6: https://www.kincony.com/download/KC868-A6-schematic.pdf

Thank you for the clarification and for sharing the KC868-A6 schematic.
I also have a KC868-A16 board.
Could you please confirm whether the PCF8574 INT pin is connected to any ESP32 GPIO on the A16 model?

• If yes → which GPIO number is it connected to?
  
• If not → is there a pad/test-point where we can manually access the INT pin?
  Also could you share the full schematic for KC868-A16
  

[admin]

A16 as same as A6.
1. A16 board have not used the INT pin for PCF8574.
2. the INT pin not connect with pcb wire, so if you want to use, you need to solder the pin for your extend wire.
here is schematic of KC868-A6: https://www.kincony.com/download/KC868-A...ematic.pdf