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Hey Denny,
this is a great question. Since the design is not isolated, then it does not require the optocoupler. I would just ensure the sink and source currents are appropriate for the CPU and the TPS2378. I am not sure if we will need any sort of driver or logic circuit to make the currents appropriate since that is normally done across the optocoupler biasing.
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Regards,
Michael P.
Applications Engineer
Texas Instruments