Protection of input pins - how much is tolerable on a pin - What about my circuit?

[Tobe]

Hi,

i made up this circuit, to protect the input of the MCU. The switches pull to GND with 0 Ohm to 22kOhm, and this is also where the ESD would come in. The output_line also goes to a MCU input, and its the one i am not sure, if its protection is enough (current of R8 - D2 is representing the protection diode of the MCU). Is there something i can improve, or might there be an issue, i am not aware of?

Its made with LTSpice.

 

[TDK]

ESD limits for pins are specified in the datasheet.

 

If you need more than that, use an ESD protection diode to raise the protection level.