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Wiring diagram for safely controlling 12V DC on Pmod OD1


Question

Does anyone have a schematic showing safe wiring for controlling a 12V DC load with the Pmod OD1? I see in the reference manual there is a mention of the external power needing to be no higher than 5.25 volts, so I want to make sure I understand exactly what the requirements are.

From the reference manual at https://reference.digilentinc.com/reference/pmod/pmodod1/reference-manual -

"Any external power applied to the Pmod OD1 must be within 2.7V and 5.25V; however, it is recommended that Pmod is operated at 3.3V."

Edited by eyz
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Hi @eyz,

I apologize for the delay.

That line is in there for the IC1 and IC2 (the two schmitt triggers, https://www.onsemi.com/pub/Collateral/NL27WZ17-D.PDF, located prior to the N-FETs), as these ICs can only handle up to 5.5V from the host boards. If you leave JP1 disconnected (disconnecting the external power supply that can be applied to the separate J4 screw terminal from pin 6 on the 6-pin header), you can provide a 12V power supply and not hurt your board that way. I see that the reference manual does not make this clear, so I will get this updated.

Let me know if you have any questions.

Thanks,
JColvin

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