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Seeing as this board is primarily intended for debugging RPi Interface Rev C, which includes a buck converter with large bulk capacitance, we will need to implement surge protection as recommended by TI. They recommend their TVS2200 product.
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Power Configuration
Resistor Dividers
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Decoded ADC Values
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If the source device cannot supply voltage between the minimum and maximum voltages set by pins ADCIN1 and ADCIN2, then the controller will signal a capabilities mismatch and run the CAP_MIS pin high.