450 Hz allowed on input?

[Mikkel88]

Hi KinCony,
I am using the KC868-A8v3.1 with an ESP32-S3.

I want to connect a YF-B10 water flow sensor generating approximately 450 Hz pulses at maximum flow.

Can AI1 (GPIO7) or AI2 (GPIO6) be used as a digital pulse counter input with ESP32 PCNT?
Specifically:

1. Is there any RC filtering or other circuitry between the AI terminal and the ESP32 GPIO?
   
2. Can the analog input circuit reliably pass 450 Hz pulses?
   
3. Can you provide an example of using AI1/GPIO7 as a pulse counter with ESPHome or ESP-IDF?
   

Thank you.