How to calculate shunt voltage for the current register calculations
current register = shunt voltage * calibration register / 4096
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To calculate shunt voltage you will need to multiply the Rshunt by the Current through the shunt. (Vshunt = Rshunt * Current)
So if I am using a .01 Ohm resistor and expect a current of 2 A my shunt voltage will be Vshunt = .01*2 = .02 V or 20 mV.