jovin555
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i am trying to interface beagle bone black to TCA6424ARGJR(I/O expander). The i/o expander's 31st pin should be connected to the working voltage of the master ic.So to what voltage should i connect it in beagle bone.I am using 3.3V as power supply for I/o expander.Beagle bone has lot of voltages such as VDD3V3A,VDD3V3B etc.So to which 3.3V should i connect the Vcci pin of I/O expander?