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For S12ZVMBA does port ADx have input diodes for protection against over voltage

Question asked by RAJIV BANDODKAR on Apr 13, 2018
Latest reply on Apr 16, 2018 by lama

Hi, 

Using S12ZVMBA-48pin device. Using Port AD3 (pin17) and AD4(pin16) as digital input. The circuit has a series resistor of 47K to limit the current. The input voltage can be up to 18V. Do I need to use a zener to limit the voltage to the pin, since there does not seem to be any diode protection to the port?

 

Regards,

Rajiv Bandodkar.

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