The two most common methods of measuring current are using a Hall effect sensor, which generates a voltage proportional to the magnetic field around it (inherently isolated), or using a shunt resistor, where the voltage drop is measured and the current is calculated from Ohm's Law. Due to the large measurement range, the error using Hal effect sensors is relatively high, and so for MSXIV, we are using a shunt resistor to measure current. Because of this, we need to isolate the current measurements from the rest of the BMS. This is done by using an isolated DC-DC converter to provide 12 V, and converting the ADC's SPI output to isoSPI, which is then sent through a transformer back to the BMS carrier.
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