Recommended Protection Circuit for Cmod A7

[dfergenson]

I'm preparing to embed a Cmod A7 on a PCB and I want to provide similar circuit protection for some of its pins to those found on a Pmod output. I looked at the schematics for the Basys3 and found a 200 Ohm series resistor on each output pin and a zener diode directly from pin to ground. I  have two concrete questions:

1. Just to confirm, the Zener voltage should be 3.4V, right?

2. What power does Digilent recommend for the 200 Ohm resistor?

Thanks.

-David 

[jpeyron]

Hi @dfergenson,

Here is the Digilent Pmod™ Interface Specification 1.2.0 which should be helpful for your designs. The ESD Protection Diodes have a stand off voltages of 5 V.

thank you,

Jon

[dfergenson]

Thank you. I will follow the Pmod specification. -David